Superior Long-term Cycling Stability Research Articles

Sycamore-fruit-like SnO2@C nanocomposites: Rational fabrication, highly reversible capacity and superior rate capability anode material for Li storage

SnO2-based nanostructures have attracted considerable interest as promising high-capacity anode materials for lithium ion batteries (LIBs). Herein, we present a facile hydrothermal-carbonization approach to rationally fabricate a novel sycamore-fruit-like SnO2-based anode material (denoted as H7-500) for LIBs to simultaneously achieve high capacity, long-term cycling stability and ultrahigh rate capability. Structural analyses reveal that H7-500 possesses a sycamore-fruit-like hierarchical structure and is composed of 6–8 nm SnO2 nanoparticles coated with 1.7 nm thin carbon skins embedded on the surface region of 400 nm highly porous carbon spheres. The formation of sycamore-fruit-like structure is confirmed to be promoted by the Ostwald ripening. H7-500 delivers capabilities of 1242.3, 1116.5, 1004.8, 878, 745.8 and 488.7 mAh∙g−1 at 0.1, 0.2, 0.5, 1, 2 and 5 A g−1, respectively. A high capacity of 905.4 mAh∙g−1 sustains after 300 cycles at 1 A g−1 and a capacitance of 413.4 mAh∙g−1 maintains after 1000 cycles at 5 A g−1. Notably, H7-500 electrodes exhibit excellent sustainable stability and endurability with sustainable capacities of 177.8 mAh∙g−1 at 10 A g−1 over 4000 cycles and 133.4 mAh∙g−1 at 20 A g−1 over 10000 cycles, respectively. Frequently tuning the rate between 0.1 and 10 A g−1 has no effect on the capacity and cycling stability of H7-500. The sycamore-fruit-like H7-500 shows excellent structural stability during the charge/discharge process. The unique structure not only solves the conventional problem of pulverization, particle aggregation and volume changes but also enhances structural integrity and the reversible reaction, and accelerates the reaction rate. These features render the materials excellent electrochemical performances with high capacity, superior rate capability and long-term cycling stability. The present results may also provide insights into the ongoing extensive endeavor to improve the properties of other electrode materials.

Unlocking the Poly(vinylidene fluoride-co-hexafluoropropylene)/Li10GeP2S12 composite solid-state Electrolytes for Dendrite-Free Li metal batteries assisting with perfluoropolyethers as bifunctional adjuvant

Sulfide-based composite solid-state electrolyte has been deemed as “Holy Grail” for unlocking solid-state lithium metal batteries (SSLMBs) with high-energy density, combining the extremely high ionic conductivity of sulfide and machinability of organic polymer. However, this appealing system is hitherto stymied by two hindrances, difficult to synthesize due to the chemical incompatibility of sulfide with moisture and polar solvents, moreover, interfacial instability with lithium (Li) anode inducing severe Li dendrite grown. Herein, by utilizing perfluoropolyethers as bifunctional adjuvant, we initiatively fabricate sulfide-based composite electrolyte, Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)/Li10GeP2S12 and assemble SSLMBs. Perfluoropolyethers with low molecular weight facilitate the stable dispersion of Li10GeP2S12 in casting solution, ascribed to their strong electronegativity of C–F bonds. In addition, high molecular weight perfluoropolyethers function as interfacial stabilizer, dramatically improving the interfacial compatibility with Li anode by in-situ forming a LiF-rich solid electrolyte interphase layer. This composite electrolyte exhibits high room temperature ionic conductivity (0.18 mS cm−1), outstanding lithium ion transfer number (0.68), good mechanical strength and nonflammability. The solid-state LiFePO4ǁLi battery presents superior long-term cycling stability and rate capability. Our study paves a new way for fabricating the sulfide-based composite electrolyte, provides an effective strategy for constructing compatible solid-state electrolyteǁLi interface.

Mega High Utilization of Sodium Metal Anodes Enabled by Single Zinc Atom Sites.

Low utilization of active metallic sodium (Na) and uncontrollable growth of Na dendrites remain significant challenges for high-performance Na metal batteries, which are limited to inefficient Na utilization (<1%) and shallow cycling conditions (0.25-1.0 mAh cm-2). In this work, a kind of Na metal anode with record-high utilization and long-term cycling stability is reported, using carbon-substrate-supported nitrogen-anchored zinc (Zn) single atoms as a current collector. Single Zn atom sites whichserve as a strong "magnet" for Na ions,can guide the metallic Na uniform nucleation and free from dendrite-induced short circuit. The nucleation overpotential of our strategy is essentially zero, where most of the reported modified substrates weregreatly exceed 20 mV. Specifically, the Na anodes exhibit a high Na stripping/plating Coulombic efficiency with 99.8% over 350 cycles and a stable voltage response with small voltage hysteresis after cycling 1000 h. The full cell exhibits high Na utilization up to 100% and superior long-term cycling stability for more than 1000 cycles with excellent capacity retention. In terms of lifetime and Na utilization, the Na metal anodes based onour strategysignificantly outperforms the reported state-of-the-art Na metal anodes. Moreover, this affords new insights into the controllable Na nucleation behavior and high Na utilization and sheds fresh light on atomic level design of an electrode for Na metal anodes.

A carbon-based anode combining with SiO and nanodiamond for high performance lithium ion battery

• Nanodiamond is introduced into SiO x /carbon-based anode for improving the cycle stability and specific capacity of lithium ion batteries. • The anodes with nanodiamond are prepared by a microwave procedure. • The enhancement mechanism of high performance of LIBs is investigated based on the nanodiamond-related anode materials. We report a novel anode consisting of detonation nanodiamond, SiO x nanoparticals and carbon nanosheets, to achieve high performance lithium-ion batteries. In the process of charge and discharge, the lithium ion batteries using the prepared nanocomposite anode show remarkable capacity performance with a specific capacity of 1182 mA h g −1 at a constant current of 100 mA g −1 after 100 cycles. With further increasing the current to 1000 mA g −1 , a high specific capacity of 622 mA h g −1 can be realized after 750 cycles, indicating a superior long-term cycle stability. The improvement of cycle stability and specific capacity can be attributed to the introduction of nanodiamond to form an effective buffer structure and efficient Li + transport pathway.

Facile synthesis of nitrogen self-doped hierarchical porous carbon derived from pine pollen via MgCO3 activation for high-performance supercapacitors

The development of simple and green synthetic strategies to obtain porous carbon with both high energy density and power density for carbon-based supercapacitors has motivated the utilization of sustainable biomass materials, due to their unique microstructures and high heteroatom contents. Herein, a novel, green and efficient activation agent magnesium carbonate is proposed to prepare nitrogen self-doped hierarchical porous carbon materials derived from pine pollen for superior carbon-based supercapacitors. The obtained carbon has a large surface area of 1311.2 m2 g−1, hierarchical porous structure with interconnected meso-/macropores and high nitrogen, oxygen contents. When applied as supercapacitor electrode in a three-electrode system, the carbon-based electrode exhibits a high specific capacitance of 419.6 F g−1 at a current density of 1 A g−1, good rate retention of 60.3% from 1 to 100 A g−1 and superior long-term cycling stability with 2.6% loss of its initial capacitance after 10,000 cycles in 6 M KOH aqueous electrolyte. Additionally, the assembled symmetric supercapacitor can work at a high voltage of 2.0 V in 1 M Na2SO4 aqueous electrolyte, and deliver an ultrahigh energy density of 34.9 Wh kg−1 at a power density of 181.0 W kg−1.

Flexible Conductive Anodes Based on 3D Hierarchical Sn/NS-CNFs@rGO Network for Sodium-Ion Batteries

Highlights3D hierarchical conductive Sn quantum dots encapsulated in N,S co-doped carbon nanofibers sheathed within rGO scrolls (Sn/NS-CNFs@rGO) were prepared through an electrospinning process.Flexible Sn/NS-CNFs@rGO electrode exhibits superior long-term cycling stability and high-rate capability in sodium-ion batteries.

Developing A “Polysulfide‐Phobic” Strategy to Restrain Shuttle Effect in Lithium–Sulfur Batteries

Inspired by hydrophobic interface, a novel design of "polysulfide-phobic" interface was proposed and developed to restrain shuttle effect in lithium-sulfur batteries. Two-dimensional VOPO4 sheets with adequate active sites were employed to immobilize the polysulfides through the formation of a V-S bond. Moreover, owing to the intrinsic Coulomb repulsion between polysulfide anions, the surface anchored with polysulfides can be further evolved into a "polysulfide-phobic" interface, which was demonstrated by the advanced time/space-resolved operando Raman evidences. In particular, by introducing the "polysulfide-phobic" surface design into separator fabrication, the lithium-sulfur battery performed a superior long-term cycling stability. This work expands a novel strategy to build a "polysulfide-phobic" surface by "self-defense" mechanism for suppressing polysulfides shuttle, which provides new insights and opportunities to develop advanced lithium-sulfur batteries.

New Hexagonally Ordered Monolayer Electrode with Monodisperse Carbon/Fe3O4 Microspheres for High Performance Lithium Ion Battery Anodes

This work details the facile preparation of a hexagonally ordered monolayer electrode with monodispersed hollow C/Fe3O4 microspheres as a novel anode candidate for lithium-ion batteries. The monolayer electrode was produced by the heat treatment of a polyvinyl alcohol film comprising a monolayer of microspheres. The electrode was prepared by stamping with microspheres assembled into the monolayer, using an ordered patterning micro-framework polydimethylsiloxane on a polyvinyl alcohol spin-coated cupper foil. The morphological and structural characterizations of the monolayer electrode were conducted by optical microscopy, scanning electron microscopy, focused-ion beam scanning electron microscopy, transmission electron microscopy, and X-ray diffractometery. Although the monolayer electrode was composed of the active materials only without the use of any polymeric binder or carbon additives such as acetylene black and Super-P, the electrode exhibited a superior long-term cycling stability and rate capability with the coulombic efficiency of 99% at a high current rate due to the good structural stability and low electrical resistance as a result of the ordered monolayer structure.

Flame-retardant quasi-solid polymer electrolyte enabling sodium metal batteries with highly safe characteristic and superior cycling stability

Conventional liquid electrolytes based sodium metal batteries suffer from severe safety hazards owing to electrolyte leakage, inflammability and dendritic sodium deposition. Herein, we report a flame-retardant quasi-solid polymer electrolyte with poly(methyl vinyl ether-alt-maleic anhydride) (P(MVE-alt-MA)) as host, bacterial cellulose (BC) as reinforcement, and triethyl phosphate/vinylene carbonate/sodium perchlorate (TEP/VC/NaClO4) as plasticizer for highly safe sodium metal batteries. The as-obtained quasi-solid polymer electrolyte exhibits superior flame retardancy (self-extinguish within 1 s), complete non-leakage property and wide electrochemical windows (4.4 V). More importantly, Na3V2(PO4)3/Na metal batteries using such polymer electrolyte delivers superior long-term cycling stability (84.4% capacity retention after 1000 cycles) which is significantly better than that (only 2% after 240 cycles) of liquid electrolyte. In addition, this flame-retardant quasi-solid polymer electrolyte provides favorable cycle performance (80.2% capacity retention after 70 cycles at 50 °C and 84.8% capacity retention after 50 cycles at −10 °C) for Na3V2(PO4)3/Na metal batteries. And this battery also displayed a normal charge/discharge property even at −15 °C. These fascinating cycle properties are mainly ascribed to the effective protective layers formed on Na3V2(PO4)3 cathode and sodium metal anode. More thorough investigation elucidates that such flame-retardant quasi-solid polymer electrolyte plays a multifunctional role in the advanced sodium metal batteries: (1) Being involved in the formation of a favorable cathode electrolyte interface (CEI) to inhibit the dissolution of vanadium and maintain the structure integrity of the Na3V2(PO4)3; (2) Participating in building a stable solid electrolyte interface (SEI) to suppress the growth of Na dendrites; (3) Integrating flame-retardance into polymer sodium batteries to enhance flame-resistance, eliminate electrolyte leakage, and thus improve safety of sodium batteries. Based on these results, we further assembled Na3V2(PO4)3/MoS2 pouch cell which can withstand harsh conditions (bended or cut off a corner), confirming the obtained polymer electrolyte with superior non-leakage property. In all, these outstanding characteristics would endow this flame-retardant quasi-solid polymer electrolyte a very promising candidate for highly-safe sodium metal batteries.

Direct growth of WO3 nanostructures on multi-walled carbon nanotubes for high-performance flexible all-solid-state asymmetric supercapacitor

The rational design and development of highly conductive hierarchical nanostructured materials are of great importance to improve the electrochemical performance of supercapacitors. Great efforts have been committed to the development of positive electrodes for asymmetric supercapacitors (ASC). However, it is still necessary to develop better negative electrodes for practical applications. In present investigation, a multi-walled carbon nanotubes-tungsten trioxide (MWCNT-WO3) hybrid nanostructure is prepared as a negative electrode for ASC. The MWCNT-WO3 hybrid electrode is prepared using a simple two-step approach, which involves coating of MWCNTs on carbon cloth substrates followed by hydrothermal treatment to deposit WO3 nanorods on the MWCNT-coated carbon cloth. The MWCNT-WO3 hybrid electrode exhibits a maximum specific capacitance (areal capacitance) of 429.6 F g−1 (1.55 F cm−2) and capacity retention of 94.3% after 5000 cycles, which are higher than the 155.6 F g−1 (0.43 F cm−2) and 84.9% shown by pristine WO3 in 1 M LiClO4 electrolyte. A flexible all-solid-state ASC is self-assembled with MWCNT-WO3 as a negative electrode, MnO2 as a positive electrode, and PVA-LiClO4 as a gel electrolyte. The MnO2//MWCNT-WO3 ASC achieve specific capacitance of 145.6 F g−1 at a current of 2 mA and specific energy of 39.63 Wh kg−1 at a specific power of 546 W kg−1. Specifically, the ASC exhibits superior long-term cycling stability (77% over 10000 cycles) and excellent mechanical flexibility with less capacitance loss. These remarkable results demonstrate the potential of using MWCNT-WO3 hybrid nanostructures for the fabrication of high-performance energy storage devices.

Activated carbon felts with exfoliated graphene nanosheets for flexible all-solid-state supercapacitors

The recent development of portable electronics promotes the growing demand for flexible energy storage devices. Supercapacitors are promising candidates due to their high power density. Therefore, flexible supercapacitors are desired. Here, the porous activated carbon felts (ACFs) with exfoliated graphene nanosheets and rich oxygen-containing groups were fabricated by a facile thermal treatment strategy. Such ACFs can act as the flexible electrodes of all-solid-state supercapacitors directly without the use of binder and conductive materials. They exhibit excellent electrochemical properties, such as high specific areal capacitance, superior rate ability and long-term cycling stability. Moreover, the fabricated flexible all-solid-state supercapacitors based on ACFs deliver stable electrochemical performance under different bending states.

N-doped TiO2/rGO hybrids as superior Li-ion battery anodes with enhanced Li-ions storage capacity

In this article, nitrogen is successfully doped into both components of TiO2/reduced graphene oxide composites via a hydrothermal-post thermal treatment. The N-doped TiO2/reduced graphene oxide electrode presents obviously higher Li-ion storage performance (270 mAh g−1 at current density of 0.1 A g−1) than the undoped product. This N-doped composite could also exhibit superior long-term cycling stability with a reversible capacity of 210 mAh g−1 even after 2000 cycles. Further electrochemical analysis finds the number of active Li-ions is increased from the formation of NTiO and NC bonds, which greatly improves the charge/discharge process in the anode for lithium-ion batteries. This work may improve understanding of the doping effects of various elements present in electrode materials.

CoSe2 hollow microspheres, nano-polyhedra and nanorods as pseudocapacitive Mg-storage materials with fast solid-state Mg2+ diffusion kinetics.

CoSe2 materials with different nanostructures are used as pseudocapacitive Mg-storage cathodes, which exhibit fast solid-state Mg2+ ions diffusion kinetics. In this work, CoSe2 with different nanostructures including hollow microspheres (H-CoSe2), nano-polyhedra (P-CoSe2) and nanorods (R-CoSe2) are fabricated by using facile one-step hydrothermal methods, and used as pseudocapacitive electrodes for rechargeable Mg batteries. It is observed that R-CoSe2 exhibits the highest reversible capacity of 233 mA h g-1 at 50 mA g-1 and an excellent rate capability of 116 mA h g-1 at 500 mA g-1, ascribing to the 1D nanorod structure which facilitates the solid-state Mg2+ diffusion. Benefitting from the stable hierarchical structure, H-CoSe2 exhibits a superior long-term cycling stability of 350 cycles. A mechanism study indicates that the redox reaction reversibly occurs between CoSe2 and metallic Co0. Further investigation demonstrates that the fast solid-state Mg2+ diffusion kinetics and surface-controlled pseudocapacitive behavior enhance the electrochemical performance. This work highlights a novel and efficient Mg-storage strategy of using pseudocapacitive materials, and the performance and solid-state Mg2+ diffusion kinetics of CoSe2 could be optimized by rational structural tailoring.

Biomass waste-derived nitrogen-rich hierarchical porous carbon offering superior capacitive behavior in an environmentally friendly aqueous MgSO4 electrolyte

Nitrogen-doped porous carbons have been extensively investigated to improve the specific capacitance in aqueous electrolytes by increasing the specific surface area and nitrogen content and by optimizing the pore structure. However, research on the effect of electrolyte cations on the specific capacitance of these materials is rare, especially for neutral electrolytes. Herein, a nitrogen-rich hierarchically porous carbon (NRHPC) with a high nitrogen content of 12.3 atm% is successfully prepared by pyrolyzing a mixture of bagasse, K2CO3 and urea in a mass ratio of 2:1:4. It is found that NRHPC shows superior electrochemical performance in MgSO4 than in Li2SO4 electrolyte, with specific capacitances of 315.0, 274.4, and 188.1 F g−1 at 1.0, 10.0, and 100 A g−1, respectively. Furthermore, it is found that the capacitance enhancement is closely related to the nitrogen content of the porous carbon materials. Theoretical calculation reveals that the Mg2+ ions have higher affinity towards the N atoms than Li+, producing higher charge storage capability via interaction between the Mg2+ and N atoms. When the 1.0 M MgSO4 is used as electrolyte, a symmetric capacitor based on the nitrogen-rich hierarchically porous carbon shows a high energy density of 39.5 Wh kg−1 at a power density of 0.9 kW kg−1. Moreover, this as-assembled device displays superior long-term cycling stability, with a capacitance retention of >96.2% after 10,000 cycles at 10.0 A g−1.

Small nitrogen-doped carbon dots as efficient nanoenhancer for boosting the electrochemical performance of three-dimensional graphene

As a new class of zero-dimensional carbon nanomaterials, carbon dots have triggered intensive research interest in various fields. However, the low surface area, hydrophilicity, and agglomeration characteristics limit their applications in energy storage fields. Herein, we demonstrate that nitrogen-doped carbon dots can be employed as efficient nanoenhancer to boost the electrochemical performance of three-dimensional graphene. The as-prepared materials exhibit an interconnected framework with abundant oxygen- and nitrogen-containing functional groups, which enable fast penetration and transport of electrolyte ions and provide more active sites and electric conductivity. Employed as binder-free electrode for supercapacitors, the resultant materials present high specific capacitance (338 F g−1) and areal capacitance (604 μF cm−2) at a current density of 0.5 A g−1, which is much higher than that of pristine three-dimensional graphene (190 F g−1, and 114 μF cm−2), with an enhancement of 78% and 430%, respectively. Moreover, superior long-term cycling stability (94% of capacitance retention after 20 000 charging/discharging cycles at 10 A g−1) as well as improved electric conductivity can also be achieved. These results certify that nitrogen-doped carbon dots can be applied as nanobooster to comprehensively improve the performance of graphene for high-performance electrochemical energy storage.

Decoration of g-C3N4 with hydrothermally synthesized FeWO4 nanorods as the high-performance supercapacitors

Highly crystalline FeWO4 nanorods (FWO NRs) prepared by a hydrothermal reaction is combined with g-C3N4 (gCN) nanosheet as an electrode material for the supercapacitor. Fabricated nanocomposites were analysed using X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), X-ray photoelectron microscopy (XPS), and Raman Spectroscopy. Pseudocapacitive performance of the FWO/gCN nanocomposite was evaluated by cyclic voltammetry (CV), electrochemical impedance and galvanometric experiments in an alkaline medium. Thus FWO/gCN nanocomposite exhibited a high specific capacitance of 357 F g−1 at 5 mV s−1 and demonstrated a superior long-term cyclic stability, with the specific capacitance retention of about 80% after 1000 cycles.

Manganese phosphate coated Li[Ni0.6Co0.2Mn0.2]O2 cathode material: Towards superior cycling stability at elevated temperature and high voltage

Nickel-rich Li[Ni0.6Co0.2Mn0.2]O2 is considered to be the next step forward towards the realization of high-energy lithium-ion batteries and has, thus, attracted intensive attention recently. However, achieving long-term cycling stability at elevated temperatures and voltages still remains a formidable challenge for practical applications. In this work, we successfully synthesized MnPO4-coated Li[Ni0.6Co0.2Mn0.2]O2 (MP-NCM) with an advantageously low coating content of only 1 wt% while providing substantially enhanced electrochemical performance and outstanding cycling stability. This improvement is ascribed to the MnPO4 coating, acting as an ideal protective layer to dramatically reduce the occurring side reactions with the electrolyte, especially at higher temperatures and cut-off voltages. By preventing the direct contact between the cathode active material and the electrolyte, the presence of the coating layer reduces the transition metal dissolution, thus, yielding good structural integrity upon cycling, while its amorphous nature allows for an enhanced apparent lithium ion diffusion, i.e., lithium de-/insertion kinetics. Additionally, the strong covalent bonding of the PO4-group contributes to an increased thermal stability and the high voltage performance of MP-NCM. On the basis of our work, the coating design strategy delivers valuable materials for the practical realization of lithium-ion batteries with superior long-term cycling stability at higher operation temperature and voltage.

Unexpected Effect of Electrode Architecture on High-Performance Lithium-Sulfur Batteries.

In the past years, considerable efforts have been devoted to the deliberate synthesis of nanosulfur in various hosts with sophisticated structures to improve the performance of lithium-sulfur batteries (LSBs) and reveal the structure-property relationship. It is taken for granted that these elaborate sulfur nanostructures are well maintained in the ultimate electrode after the traditional mixing and coating method. Herein, we, for the first time, reveal the unexpected sulfur structure deterioration in nanosulfur/graphene composites during the electrode preparation using the traditional method because of the long-term neglected dissolution-recrystallization effect of sulfur in solvents. Consequently, compared with binder-free three-dimensional graphene/sulfur electrodes, the milled graphene/sulfur electrodes exhibit much worse electrochemical performance. On the basis of this, we further propose a facile and universal graphene oxide-assisted assembly method to avoid the dissolution-recrystallization of sulfur, by which binder-free three-dimensional ethylenediamine-functionalized graphene/sulfur (3DEFGS) electrodes have been successfully prepared. The 3DEFGS electrodes with a high areal sulfur loading of ∼6 mg cm-2 exhibit an ultrahigh initial capacity of 1394 mA h g-1 at 0.1 C, an excellent rate performance with a capacity of 796 mA h g-1 at 4 C, and superior long-term cycling stability (885 mA h g-1 after 500 cycles at 1 C), which are among the best performances achieved by all reported LSB cathodes with high areal sulfur loadings.

Fabrication of Lithiophilic Copper Foam with Interfacial Modulation toward High-Rate Lithium Metal Anodes.

Although metallic lithium is regarded as an ideal anode material for high-energy-density batteries, the low cycling efficiency and safety issues hinder its practical application. In this study, a three-dimensional (3D) lithium composite anode was developed through infusing molten lithium inside the Cu foam anchored by ZnO nanoparticles. The introduced ZnO layer provides the driving force for infusion, leading to the spontaneous wetting of molten lithium. Benefiting from well-confined preloaded lithium in the Cu network, the anode displays ultralow internal resistance and stabilized interface. The fabricated anode for the symmetric cell shows extraordinarily low overpotential at high current densities (15, 33, and 50 mV at 3, 5, and 8 mA cm-2 after 100 cycles, respectively). When paired with Li4Ti5O12 electrode, the half-type cell demonstrates superior rate capability and long-term cycling stability after 1000 cycles at an ultrahigh rate of 10C. To the best of our knowledge, this anode shows the lowest overpotential and the highest rate capacity ever reported for 3D design anodes, confirming their great potential as lithium metal anodes.

The double effects of sulfur-doping on MoO2/C nanofibers with high properties for Na-ion batteries

The S-doped MoO2/C nanofibers (S-doped carbon and MoO2) are prepared through a sulfuration reaction. For one thing, the introduction of sulfur into the carbon structure can significantly enhance charge transportation velocity and provide more additional activity sites to accommodate Na+. For another, it is able for molybdenum disulfide with higher theoretical capacity to promote the Na+ storage. So we investigate the S-doped MoO2/C nanofibers as for SIBs, the electrode yields a high reversible capacity at 0.1 A g−1 after 50 cycles (269 mA h g−1). Even at 5 A g−1, it maintains superior long-term cycling stability and holds 86 mA h g−1 over 1200th cycle. The whole synthetic process is high yielding, eco-friendly, making it suitable for large-scale production applications.