High Current Cycling Research Articles

Flexible and free-standing electrode for high-performance vanadium redox flow battery: Bamboo-like carbon fiber skeleton from textile fabric

Developing the free-standing and flexible electrodes with high current density and cycle stability is still under debate towards the extensive application of vanadium redox flow batteries (VRFBs). So far, carbon felts, carbon fibers and carbon papers are used which mostly prepared from fossil precursors make them unsustainable. Herein, we first sought to prepare a mechanically flexible and free-standing carbon cloth from terry cloth towel fabric (100% cotton) by using a simple pyrolysis method (TCC). Interestingly, we obtained a bamboo-like carbon fiber structure with a well-balanced micro, -meso, and -macro porosity. Moreover, a low-cost Polyethyleneimine (PEI) is used for Nitrogen doping on carbon cloth skeleton (N-TCC) to improve its electrochemical performance. The as-prepared N-TCC were utilized as efficient electrodes for the VRFBs with higher electrochemical activity towards vanadium species VO2+/VO2+ than TCC and commercial graphite felt (GF) in a 3 electrode electrochemical cell i.e. half-cell. Interestingly, the VRFBs constructed with N-TCCs electrodes (both +ve and –ve half cells) in a full cell configuration at varied current densities from 40 to 160 mA cm−2, we achieved an increased energy efficiency (EE), voltage efficiency (VE), and columbic efficiency (CE) compared to pristine CFs, and TCC based VRFBs. The newly designed cotton based electrodes establishes a unique opportunity for constructing a low-cost, metal-free VRFBs towards a large-scale commercialization of sustainable energy storage system.

Research on the Mechanism of Cathode Failure of Lead-Acid Battery Under Extreme Conditions

Abstract Lead-acid batteries have the advantages of wide temperature adaptability, large discharge power, and high safety factor. It is still widely used in electrochemical energy storage systems. In order to ensure the application of batteries under extreme working conditions, it is necessary to explore the degradation mechanism. In this study, the experimental battery is the same type of 2 V-500 Ah lead-acid battery produced by different manufacturers. First, the three batteries were subjected to the same high temperature and high current cycle thermal shock test (50 °C, 0.2 C current) combined with quantitative analysis of plate active material and microscopic morphology observation. In addition, numerical studies are used to simulate the distribution of electrical parameters on the positive plate and grid. The above three parts are combined to study the causes of accelerated battery decay under high temperature and high current conditions. The results showed that the extreme conditions aggravated the non-uniformity of the potential distribution of the positive plate and the grid, which increased by 10.62% and 51.59%, respectively. The battery with higher remaining capacity has more α-PbO2 in the active material, and has a considerable amount of β-PbO2. The battery with the smallest remaining capacity has the largest volume of active material. The volume of the material affects the electrochemical reaction surface area. The larger the volume of the material, the higher the resistance of that part, which will lead to an increase in the overall impedance of the battery.

Self-Supporting Multicomponent Hierarchical Network Aerogel as Sulfur Anchoring-Catalytic Medium for Highly Stable Lithium-Sulfur Battery.

The low utilization rate of active materials, shuttle effect of lithium polysulfides (LiPSs), and slow reaction kinetics lead to the extremely low efficiency and poor high current cycle stability of lithium sulfur batteries (Li-S batteries). In this paper, a self-supporting multicomponent hierarchical network aerogel is proposed as the modified cathode (S/GO@MX@VS4 ). It consists of graphene (GO) and MXene nanosheets (MX) loaded with VS4 nanoparticles. The experimental results and first-principles calculations show that the GO@MX@VS4 aerogel has strong adsorption and reversible conversion effects on LiPSs. It can not only inhibit the shuttle effect and improve the utilization rate of active substances by keeping the chain crystal structure of VS4 , but also promote the reversibility and kinetics of the reaction by accelerating the liquid-solid transformation in the reduction process and the decomposition of insoluble Li2 S in the oxidation process. The GO@MX@VS4 aerogel modified cathode with a multicomponent synergy exhibits the capacity ratios (Q1 /Q2 ) at different discharge stages is close to the theoretical value (1:2.8), and the capacity decay per cycle is 0.019% in 1200 cycles at 5C. Also, a high areal capacity of 6.90 mAh cm-2 is provided even at high sulfur loading (7.39mg cm-2 ) and low electrolyte/sulfur ratio (E/S, 8.0µL mg-1 ).

Dual fuzzy-based adaptive extended Kalman filter for state of charge estimation of liquid metal battery

Liquid metal batteries (LMBs) are alternatives to conventional lithium-ion batteries due to their specific benefits including high current density and long cycle life. Accurate state of charge (SOC) estimation is an important evaluation index for the battery management system (BMS), which is of great significance to ensure the safe operation of batteries. However, the estimation accuracy of SOC is influenced by many factors, including self-aging and external operating environment changes. Therefore, an online battery model with real-time parameter updates is necessary for accurate SOC estimation. In this paper, a novel dual fuzzy-based adaptive extended Kalman filter (DFAEKF) method is proposed for the SOC estimation of LMBs. Firstly, a second-order RC equivalent circuit model is established to describe the battery's behavior. The forgetting factor recursive least squares (FFRLS) is utilized to identify the model parameters and reconstruct the battery open circuit voltage (OCV). Secondly, the dual adaptive extended Kalman filter (DAEKF) is derived from the battery model. And an intelligent noise estimator is designed based on a fuzzy inference system, which adaptively adjusts the length of the residual innovation sequence (RIS), to update the noise covariance. Finally, the DFAEKF algorithm is proposed for the battery SOC and parameter co-estimation. The online estimated ohmic resistance is employed to calculate the state of health (SOH) of the battery. The proposed DFAEKF is verified through different experiments and compared to conventional algorithms. Experimental results show that the DFAEKF has higher accuracy (error < 1 %) and stronger robustness. The proposed method can also be applied to other model-based state estimation areas.

ZnMn2O4@Mo6S9.5 hierarchical mesoporous microflowers for Li-ion batteries

ZnMn2O4@Mo6S9.5 hierarchical mesoporous microflowers have been constructed for anode applications in Li-ion batteries (LIBs). Ultrathin Mo6S9.5 nanosheets have grown on ZnMn2O4 microspheres by hydrothermal method and calcination process to synthesis ZnMn2O4@Mo6S9.5 hierarchical mesoporous microflowers (HMMs). The initial discharge/charge capacities of ZnMn2O4@Mo6S9.5 HMMs were 1203/846 mA h g−1. After high-current cycles, reversible capacity was 731 mA h g−1 at 100 mA g−1, which was close to that of the first 10 turns. The excellent performance could be ascribed to the synergistic effect among ZnMn2O4, Mo6S9.5 and the 3D hierarchical architecture. The results demonstrate that ZnMn2O4@Mo6S9.5 HMMs have broad application prospect as electrochemical energy storage device.

Porosity Tunable Poly(Lactic Acid)-Based Composite Gel Polymer Electrolyte with High Electrolyte Uptake for Quasi-Solid-State Supercapacitors.

The growing popularity of quasi-solid-state supercapacitors inevitably leads to the unrestricted consumption of commonly used petroleum-derived polymer electrolytes, causing excessive carbon emissions and resulting in global warming. Also, the porosity and liquid electrolyte uptake of existing polymer membranes are insufficient for well-performed supercapacitors under high current and long cycles. To address these issues, poly(lactic acid) (PLA), a widely applied polymers in biodegradable plastics is employed to fabricate a renewable biocomposite membrane with tunable pores with the help of non-solvent phase inversion method, and a small amount of poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) is introduced as a modifier to interconnect with PLA skeleton for stabilizing the porous structure and optimizing the aperture of the membrane. Owing to easy film-forming and tunable non-solvent ratio, the porous membrane possesses high porosity (ca. 71%), liquid electrolyte uptake (366%), and preferable flexibility endowing the GPE with satisfactory electrochemical stability in coin and flexible supercapacitors after long cycles. This work effectively relieves the environmental stress resulted from undegradable polymers and reveals the promising potential and prospects of the environmentally friendly membrane in the application of wearable devices.

Hybrid Design of Bulk‐Na Metal Anode to Minimize Cycle‐Induced Interface Deterioration of Solid Na Metal Battery

AbstractThe pursuit for high‐energy and intrinsically safe energy storage is significantly driving the development of solid‐state alkali metal batteries. The interfacial contact between the metal anode and the solid electrolyte plays a key role in enabling stable cycling of solid batteries. However, the sluggish alkali atom replenishment rate during stripping unavoidably leads to the interface deterioration that destroys the initial physical contact by forming interfacial voids and triggering the dendrite growth. Herein, a hybrid bulk Na anode approach is proposed by incorporating an ion‐conducting phase into a metallic Na matrix, constructing an abundant interfacial electrochemical reaction area and enabling a balanced Na replenishment and consumption to minimize cycle‐induced interface deterioration. Specific attention is paid to the effects of the second phase on the wettability and creep ability of hybrid Na metal. A high critical current density (3.1 mA cm‐2) and long cycling life (6000 h in 0.5 mA cm‐2) are achieved for the symmetric cells. Full cells coupling the hybrid anode with the Na3V2(PO4)3/C cathode deliver excellent cyclability over 7300 cycles at a high rate of 5 C. The viewpoint of balancing the consumption and replenishment rate of metal atoms paves a new way for designing cycle‐stable anode/electrolyte interface in solid‐state batteries.

Nanoarchitectonics of the supercapacitor performance of LaNiO3 perovskite on the graphitic-C3N4 doped reduced graphene oxide hydrogel

Designing highly efficient, low-cost hybrid nanostructures with having favorable morphology and excellent conductivity is very promising for electrodes used in electrochemical storage devices. This study shows the synthesis of a new three-dimensional (3D) hybrid structure consisting of lanthanum nickel oxide (LaNiO3) perovskite, graphite carbon nitride (g-C3N4), and reduced graphene oxide hydrogel (RGOH) structures for the new hybrid supercapacitor (SC) application. The 3D hybrid structure, which is a new SC application, draws attention according to the specific capacitance (Cs) result for graphene-based hydrogel structure. For this purpose, while g-C3N4 is selected to plays an important role to increase the electrochemical activity of SC, the LaNiO3 perovskite structure is used to increase the discharge capacity of SC as well as to provide high discharge current and long cycle life. As a result of electrochemical studies, the superior capacitive performance of LaFeO3/g-C3N4@RGOH showed Cs and unique performance of 750.56 F g−1 at a current density of 1 A g–1. The 3D structure is used as anode material for fabricating symmetric two-electrode supercapacitor systems. Moreover, the LaFeO3/g-C3N4@RGOH materials display magnificent cyclic stability of 82% for 5000 cycles at a current density of 10 A g − 1, which claims the new material progress in the energy field.

High Current Density and Long Cycle Life Enabled by Sulfide Solid Electrolyte and Dendrite‐Free Liquid Lithium Anode

AbstractLithium metal is the ideal anode candidate but suffers from great challenges including poor thermodynamic stability in liquid organic electrolytes and dendrite nucleation/growth during the continuous plating/stripping process. To solve the difficulties listed above, here, a battery configuration combining a liquid lithium solution anode, a sulfide solid electrolyte, and an interfacial protection layer is proposed to prevent interfacial reaction between the two components. This configuration combines the advantages of liquid‐lithium‐solution anode (dissolve lithium to essentially prevent lithium nucleation) and sulfide solid electrolyte (highest room‐temperature ionic conductivity among all solid electrolytes and ideal mechanical ductility for fully compact layer simply by cold pressing), so that a record‐high current density (17.78 mA cm−2) and long cycle life (nearly 3000 h) are realized. At the same time, the solubility of lithium metal in the liquid Li anode and electrochemical properties of liquid Li anode are systematically studied to find the most suitable liquid Li anode concentration with the highest room‐temperature conductivity (12.2 mS cm−1). This work provides a promising approach and battery configuration for achieving high‐specific‐capacity, high‐energy/power‐density and long‐cycle‐life secondary batteries.

Constructing in-situ polymerized electrolyte on lithiophilic anode for high-performance lithium–air batteries operating in ambient conditions

The only way for commercial application of Li−air batteries with open structure is to receive O2 from ambient air. Nevertheless, H2O-containing ambient air easily induces Li passivation/dendrites and electrolyte decomposition. Apart from above issues, volatilization and leakage of organic liquid electrolytes and relatively infinite dimension variation of metallic Li also seriously discount performance of Li−air batteries. Herein, Li coating polythiophene-derived (S-doped) carbon fiber-based electrode (Li/SC) is prepared by simple rolling method and then in situ coated with deep eutectic solvent-based polymer electrolyte (DES-PE), which are further applied as anode and electrolyte of Li−air battery, respectively. Theoretical/experimental data suggest that SC skeleton possess excellent lithiophilicity/stability which restrain dendritic Li formation and reduce electrode structure damage over cycles. Furthermore, DES-PE not only possesses high ionic conductivity (1.19*10−3 S cm−1, 30 °C), wide electrochemical window (5.0 V), no-leakage and excellent interfacial compatibility, but also combine with SC framework to greatly reduce Li passivation induced by ambient air. Hence, DES-PE@Li/SC based Li−air battery could exhibit extra-large capacity of 15,310 mAh g−1 at 100 mA g−1, high-capacity retention even under high current (11,896 mAh g−1 at 500 mA g−1) and extra-long cycling life up to 300 cycles under fixed capacity. This result provides enlightment for the advancement of Li−air batteries.

Synthesis of Phosphorus Doped Graphenes via the Yucel’s Method as the Positive Electrode of a Vanadium Redox Flow Battery

Improving electrode performances in the high-current cycles is essential to increase the global competitiveness of vanadium redox flow battery (VRFB), a widespread application potential for large-scale energy storage systems. Modifying carbon electrode surfaces with graphene-based materials and even doping of graphene with heteroatoms is a reasonably critical strategy to enhance the reaction activity and reversibility of vanadium redox couples. In this study, phosphorus-doped graphene-based electrodes were produced via Yucel’s method in phosphoric acid solution, and their use as positive electrodes for VRFB was investigated. Various electrochemical, spectroscopic, and morphologic characterization methods were used to analyze the electrodes. The effects of P-doped graphene-based materials as the positive electrode of VRFB were investigated via electrochemical methods such as cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and cyclic charge-discharge. The VRFB with phosphorous doped graphene-based electrodes prepared in the potential range between −1.0 and +2.1 V (P-GPGE1) exhibited higher discharge capacity as 1.11 Ah l−1, and energy efficiency as 73.1% at the charge and discharge current densities of 8 and 1.6 mA.cm−2, respectively. This paper reveals a promising way to produce phosphorous doped graphene-based electrodes for the next-generation VRFB, a high-power, stable, and efficient operation.

Realizing high-power and high-capacity zinc/sodium metal anodes through interfacial chemistry regulation

Stable plating/stripping of metal electrodes under high power and high capacity remains a great challenge. Tailoring the deposition behavior on the substrate could partly resolve dendrites’ formation, but it usually works only under low current densities and limited capacities. Here we turn to regulate the separator’s interfacial chemistry through tin coating with decent conductivity and excellent zincophilicity. The former homogenizes the electric field distribution for smooth zinc metal on the substrate, while the latter enables the concurrent zinc deposition on the separator with a face-to-face growth. Consequently, dendrite-free zinc morphologies and superior cycling stability are achieved at simultaneous high current densities and large cycling capacities (1000 h at 5 mA/cm2 for 5 mAh/cm2 and 500 h at 10 mA/cm2 for 10 mAh/cm2). Furthermore, the concept could be readily extended to sodium metal anodes, demonstrating the interfacial chemistry regulation of separator is a promising route to circumvent the metal anode challenges.

Two advantages by a single move: Core-bishell electrode design for ultrahigh-rate capacity and ultralong-life cyclability of lithium ion batteries

Developing efficient electrodes with superior rate performance and superb cyclability are highly desired for meeting urgent demand of high-energy and large-rate lithium ion batteries (LIBs). Electrochemical performance of popular transition metal oxide electrodes is severely restricted by its inferior structure stability and low conductivity, leading to rapid capacity fade at high current density or deep cycling. Herein, a unique 3D core-bishell (3D-CBS) nanoporous electrode with configuration of Cu (NPC) core and bi-layered conformal Cu2O@PANI shells was dedicatedly designed and built by a novel and cost-effective approach combining chemical dealloying with controlled electro-polymerization. The 3D-CBS nanoporous electrodes deliver a large reversible capacity of 349 mAh g−1 at 6000 mA g−1 after 11500 ultralong-cycles with 76% capacity retention, corresponding to only 0.002% capacity fade per cycle. The superb cyclability is related to the unique 3D-CBS electrode design and in-situ formation of Cu2O with exposed most Cu+ (Cu+/O2− = 4/1) and low-energy (111) crystal plane (0.046 eV/Å2) on NPC matrix, as confirmed by physicochemical characterization and DFT calculation. Impressively, the 3D-CBS electrode displays superior rate capability with negligible capacity fade after 5 multistep-rate periods from 2 up to 20 A g−1 and back again to 2 A g−1 repeatedly (over 400 cycles), which is ascribed to the conformal coating of PANI as protective nanolayers with good conductivity on Cu2O, achieving ultrafast Li+ diffusivity (DLi = 2.42 × 10−10 cm2 s−1) and significantly improved electron conductivity (82000 S m−1). We believe that this work provides novel insights for design and synthesis of ultrahigh-rate and ultralong-life nanostructured anodes toward advanced LIBs.

A ΔE= 0.63 V Bifunctional Oxygen Electrocatalyst Enables High-Rate and Long-Cycling Zinc-Air Batteries.

Rechargeable zinc-air batteries constitute promising next-generation energy storage devices due to their intrinsic safety, low cost, and feasibility to realize high cycling current density and long cycling lifespan. Nevertheless, their cathodic reactions involving oxygen reduction and oxygen evolution are highly sluggish in kinetics, requiring high-performance noble-metal-free bifunctional electrocatalysts that exceed the current noble-metal-based benchmarks. Herein, a noble-metal-free bifunctional electrocatalyst is fabricated, which demonstrates ultrahigh bifunctional activity and renders excellent performance in rechargeable zinc-air batteries. Concretely, atomic Co-N-C and NiFe layered double hydroxides (LDHs) are respectively selected as oxygen reduction and evolution active sites and are further rationally integrated to afford the resultant CoNC@LDH composite electrocatalyst. The CoNC@LDH electrocatalyst exhibits remarkable bifunctional activity delivering an indicator ΔE of 0.63V, far exceeding the noble-metal-based Pt/C+Ir/C benchmark (ΔE = 0.77V) and most reported electrocatalysts. Correspondingly, ultralong lifespan (over 3600 cycles at 10mAcm-2 ) and excellent rate performances (cycling current density at 100mAcm-2 ) are achieved in rechargeable zinc-air batteries. This work highlights the current advances of bifunctional oxygen electrocatalysis and endows high-rate and long-cycling rechargeable zinc-air batteries for efficient sustainable energy storage.

Layered nanocomposite separators enabling dendrite-free lithium metal anodes at ultrahigh current density and cycling capacity

Non-uniform and dendritic lithium (Li) deposition in Li metal batteries largely compromises battery performance including cycle life, capacity and safety. Various innovative approaches have been proposed to solve these issues, but stable cycling of Li metal anode at high current density and cycling capacity remains challenging. Here, we report design of layered nanocomposite separators with nacre-like microstructure by considering both the electrochemical deposition behavior and spatial distribution of Li+ ions. The separators are prepared by flow-induced alignment of Laponite@RD nanosheets along the Celgard separator surface and in situ crosslinking of the nanosheets with polyvinylalcohol. The separators enable dendrite-free lithium metal anodes at ultrahigh current density and cycling capacity simultaneously. Remarkably, stable Li metal anode with low overpotential and a long cycle life of over 2000 h is achieved by the separator even at a current density of 30 mA cm−2 and a cycling capacity of 15.0 mA h cm−2. The Li-sulfur (5.4 mg cm−2 S loading) and Li-NCM523 (8.8 mg cm−2 NCM523 loading) batteries show excellent rate performance and cycling stability. This study demonstrates the potential of polymer/clay layered nanocomposite separators for stable cycling of Li metal anodes at high current density and cycling capacity.

Co-Vacancy, Co1−xS@C flower-like nanosheets derived from MOFs for high current density cycle performance and stable sodium-ion storage

A non-stoichiometric cobalt–sulfur compound anode material with excellent electrochemical properties was prepared, and the first principles simulation described the effect of Co-vacancy on electrode reaction.

High Current Cycling in a Superconcentrated Ionic Liquid Electrolyte to Promote Uniform Li Morphology and a Uniform LiF-Rich Solid Electrolyte Interphase.

High-energy-density systems with fast charging rates and suppressed dendrite growth are critical for the implementation of efficient and safe next-generation advanced battery technologies such as those based on Li metal. However, there are few studies that investigate reliable cycling of Li metal electrodes under high-rate conditions. Here, by employing a superconcentrated ionic liquid (IL) electrolyte, we highlight the effect of Li salt concentration and applied current density on the resulting Li deposit morphology and solid electrolyte interphase (SEI) characteristics, demonstrating exceptional deposition/dissolution rates and efficiency in these systems. Operation at higher current densities enhanced the cycling efficiency, e.g., from 64 ± 3% at 1 mA cm-2 up to 96 ± 1% at 20 mA cm-2 (overpotential <±0.2 V), while resulting in lower electrode resistance and dendrite-free Li morphology. A maximum current density of 50 mA cm-2 resulted in 88 ± 3% cycling efficiency, displaying tolerance for high overpotentials at the Ni working electrode (0.5 V). X-ray photoelectron microscopy (XPS), time-of-flight secondary-ion mass spectroscopy (ToF-SIMS), and scanning electron microscopy (SEM) surface measurements revealed that the formation of a stable SEI, rich in LiF and deficient in organic carbon species, coupled with nondendritic and compact Li morphologies enabled enhanced cycling efficiency at higher currents. Reduced dendrite formation at high current is further highlighted by the use of a highly porous separator in coin cell cycling (1 mAh cm-2 at 50 °C), sustaining 500 cycles at 10 mA cm-2.

Ni-Co Double Hydroxide Grown on Graphene Oxide for Enhancing Lithium Ion Storage

It still remains a major challenge to maintain the excellent lithium ion-storage performance of layered double hydroxide (LDH) for lithium ion battery anodes at high current density and long cycle ...

Yttrium fluoride doped nitrogen-contained carbon as an efficient cathode catalyst in zinc-air battery

Recently, advanced nitrogen-containing carbon materials create a huge opportunity for developing efficient catalysts, and show great potential in zinc-air batteries (ZABs). In this study, YF3 doped nitrogen-containing carbon (YF3@NC) electrocatalyst is prepared using m-phenylenediamine as nitrogen and carbon sources. Yttrium chloride, ammonium fluoride and l-arginine are used as Y source, F source and assistant, respectively. Spherical YF3 precursor is obtained through a facile arginine-assisted hydrothermal method, which is then coated with nitrogen-containing carbon and pyrolyzed at high temperature to fabricate YF3@NC. It exhibits a positive onset potential (0.943 V), half-wave potential (0.836 V), high current density and good cycling stability (10 h degradation: 13%). When YF3@NC is applied as air cathode electrode in ZABs, the obtained battery has a high open circuit potential (1.478 V) and peak power density (75 mW cm−2). This approach makes YF3@NC to be a promising candidate as cathode catalyst in ZABs in the future.

An approach to development of the HTS magnet for SMES at JINR

Particle accelerator complex NICA (Nuclotron-based Ion Collider fAcility) comprises superconducting Booster and Nuclotron synchrotrons which magnets operating at pulse mode in opposite phase with period of about 4 seconds. Summary stored energy of Booster and Nuclotron magnets will vary from 1 to 2.6 MJ during the period. NICA power supply system can be significantly improved by Superconducting Magnetic Energy Storage (SMES) application that will help to move the energy back and force between Booster and Nuclotron. The useful energy at this SMES must be about 1.6 MJ so the maximum total SMES energy should be 3-5 MJ. SMES with this energy should have several Tesla magnetic fields to keep a reasonable size. SMES operating current can be not less than Booster and Nuclotron magnets current so it might be 10-12 kA. It is better to make such a SMES magnet from an HTS (high temperature superconductor) cable for the stability at 6-7 T and 4 s pulse mode. The SMES magnet is planned to be wound as a short solenoid (Brooks coil) of cables optimized for several coaxial sections. HTS cables with helical structure similar to well-known CORC (conductors on round core) cables are under the development at JINR. The HTS cabling technology is based on the same principle as Nuclotron type cable manufacturing technology. HTS tapes, cables and magnets experimental study and testing methods are being developed on the base of an existing test facility at LHEP. First HTS cable short sample with 6 HTS tapes was prepared and tested at 77 K in self-field. Its critical current is about 800 A that will allow achieve required operating currents of SMES magnet with a reasonable amount of HTS tapes in cables. Developments of high field high current fast cycling HTS magnets for accelerators are also being planned at JINR.