Galvanostatic Charge Discharge Method Research Articles

Geminal dicationic ionic liquid functionalized graphene nanoribbon/POAP composite film: synthesis, characterization and electrochemical pseudocapacitance performance

Herein, ionic liquid functionalized graphene nanoribbons (IL-GNR) were fabricated via geminal dicationic ionic liquid, acting as not only a reducing agent but also a functionalizing one. The analyses including scanning electron microscopy (SEM) and X-ray diffraction were employed to investigate the fabricated sample structures. Through the electropolymerization of ortho aminophenol monomers, carried out in the presence of IL-GNR, poly ortho aminophenol (POAP)/(IL-GNR) composite films, functioning as an active electrode in supercapacitor application, were prepared so that the electrochemical behavior of the conducting polymer could be enhanced. For investigation of the system behavior, various electrochemical techniques including cyclic voltammetry (CV) and galvanostatic charge-discharge method as well as electrochemical impedance spectroscopy (EIS) were utilized. Not only the superior active surface area and the composite film conductivity but also the synergistic effect existing between POAP and IL-GNR resulted in the supercapacitive performance of the fabricated composite film.

Green synthesis of nano-Co3O4 by Microbial Induced Precipitation (MIP) process using Bacillus pasteurii and its application as supercapacitor

Cobalt oxide (Co3O4) has received great attention for its use in diverse applications in science and technology. The synthesis Co3O4 by ecofriendly green technological process is the great challenge in present day research.Considering the ecofriendly green technological application, the nano-Co3O4 has been synthesized by microbial induced precipitation (MIP) process in presence of Bacillus pasteurii (OD600; 1.2 × 107cells/mL). The Co3O4 particle was synthesized with different microbial amount (10–30 mL) and Co(NO3)2 (0.01M-1.0 M) by MIP process.The results were exhibited anoptimum yield (production yield 218 mg and conversion yield 61%) of “hybrid bio-Cobalt compound”formation at 0.1 M Cobalt ion and 30 mL of B. pasteurii. The XRD results reflect the formation of Co3O4 from “hybrid bio-Cobalt compound” after calcination at 550 °C. SEM and TEM micrograph of synthesized particle reflects the non-specific shape of particle size range at 10–31 nm. The electrochemical capacitive performance was studied through cyclic voltammetry (CV) and galvanostatic charge–discharge methods with 6.0 M KOH as electrolyte. The synthesized nano-Co3O4 after calcinated at 550 °C, leads to the best specific capacitance of 162.78 F g−1 at 1 mA cm−2constant current density. The energy density and power density of the synthesized were noticed as 4.58 Wh kg−1 and 64.29 W kg−1, respectively, which indicates the MIP synthesized nano-Co3O4 particle is supercapacitor. Thus, MIP process, an ecofriendly green technological process is capable to synthesized the supercapacitor nano-Co3O4 by Bacillus pasteurii and its can be applicable to energy and environment research sector.

Study on structural, morphological, electrochemical and corrosion properties of mesoporous RuO2 thin films prepared by ultrasonic spray pyrolysis for supercapacitor electrode application

RuO2 samples were deposited on stainless steel at 723K by an ultrasonic spray pyrolysis technique using 0.005M RuCl3.nH2O as a precursor solution. XRD analysis confirms the amorphous nature of the deposited samples. Raman studies confirm the formation of RuO2 phase. SEM, AFM and HRTEM morphologies illustrate uniform spherical granular type morphology of hydrophilic nature. BET study confirms mesoporous nature. RuO2 phase formation is also confirmed by using XPS analysis. All electrochemical characterizations of the as deposited electrodes were carried out in 0.5M H2SO4 electrolyte. Optimized electrode shows maximum specific capacitance 2192F/g at 2mV/sec. The achieved maximum values of specific energy (SE) specific power (SP) and columbic efficiency (η) calculated by using galvanostatic charge-discharge method are 61.12Wh/Kg, 114.94kW/Kg and 72.34% respectively. The obtained corrosion rate is ~ 0.1171(mm/year) which is very less than reported values.

Investigation of the charge-storage behavior of electrochemically activated graphene oxide on supercapacitor electrodes in acidic electrolyte

Herein, charge storage behavior of graphene oxide electrode was investigated after its electrochemical activation. X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), galvanostatic chargedischarge method (GCD), and electrochemical impedance spectroscopy (EIS) were employed for this analysis. From XPS analysis, a decrease of atomic ratio of C=C bond was observed after electrochemical activation from 86.94 to 79.64%. Also, enhancement of specific capacitance appeared from 54.1 to 65.7 F g−1 at 20 mV s−1, and rectangular shape in CV became more collapsed in activated grapheme oxide electrode. In the GCD profiles, similarly, difference of resistance values at high and low cut-off potential became larger after activation, indicative of increased polarization. From EIS, detailed resistance components were compared, which reflected that the increased resistance and higher capacitance after activation was probably attributed to larger amount of surface functional groups after activation.

Temperature dependent morphological evaluation of spray pyrolysed TiO2 thin films prepared via aqueous route: electrochemical characterizations

Low temperature spray pyrolysis technique was used for the synthesis of mesoporous TiO2 thin films for electrochemical supercapacitor. 0.06 M aqueous solution of potassium titanium oxalate (PTO) was used to synthesize the quality thin films on stainless steel by varying decomposition temperatures from 573 to 723 K by the interval of 50 K. Uniform porous growth of TiO2 nanoparticles was confirmed by TEM and SEM. XRD study illustrates rutile tetragonal crystalline structure of the deposit at low decomposition temperature and EDX pattern confirms formation of a pristine TiO2. The wetting of surface and surface area analysis (BET) shows that the angle of contact varying from 59° to 33° and increase in surface 10.72–15.88 m2 g−1 by varying decomposition temperature respectively. The observed average pore diameter and average pore volume for optimized sample by BJH method is 3.775 nm and 0.066 cm3 g−1 respectively. Cyclic voltammetery shows maximum SC 737.1 F g−1 at 2 mV s−1 scan rate in 1 M NaOH. The highest values of specific energy (SE) 10.50 Wh Kg−1, specific power (SP) 46.66 KW Kg−1 and columbic efficiency (η) 98.00% were observed using galvanostatic charge–discharge method. Observed internal resistance was 0.9786 Ω evaluated using electrochemical impedance spectroscopy (EIS) and the achieved maximum value of specific capacitance is stable up to 2000 cycles, which is more feasible for supercapacitor application.

Porous cobalt chalcogenide nanostructures as high performance pseudo-capacitor electrodes

Electrochemical supercapacitor is an essential technology that is pivotal for the development of reliable energy storage devices. Herein, we report the fabrication of supercapacitor electrodes using nanostructured porous cobalt chalcogenide (CoTe2 and CoSe2) electrodes, anticipating an enhanced performance owing to their higher contact area with electrolyte and large pore volume enabling shorter diffusion paths for ion exchange. In this regard, we synthesized CoTe2 and CoSe2 nanostructures via an anion-exchange-reaction between pre-synthesized Co(OH)2 hexagonal nanosheets and chalcogen (tellurium and selenium) ions under hydrothermal conditions. Structural, morphological and compositional properties of the as-synthesized materials are examined using X-ray diffraction, Raman spectroscopy, scanning electron microscopy, high resolution transmission electron microscopy and energy dispersive X-ray spectroscopy. Pseudo-capacitive properties of CoTe2 and CoSe2 nanostructures as working electrodes are studied through cyclic voltammetry and galvanostatic charge-discharge methods using an electrochemical workstation. CoSe2 electrode delivered a specific capacitance of 951Fg−1 at a scan rate of 5mVs−1, which surprisingly is almost three times higher in comparison to CoTe2 electrode (360Fg−1). Both CoTe2 and CoSe2 electrodes exhibited good capacitance retention capability for 2500 CV cycles. The superior electrochemical performance of the nanoporous CoSe2 electrode indicate their applicability for high-performance energy storage device applications.

Green facile thermal decomposition synthesis, characterization and electrochemical hydrogen storage characteristics of ZnAl2O4 nanostructure

The ZnAl2O4 spinel was synthesized by a facile thermal decomposition method using green chemistry. For the first time, the electrochemical hydrogen storage performances and mechanisms of the ZnAl2O4 was studied by the galvanostatic charge-discharge method in 6 M KOH aqueous medium under 1 mA current. Anionic, cationic and polymeric surfactants were used to increase of hydrogen storage and specific area of ZnAl2O4 spinel. The composition, structure, morphology and specific surface area of the samples were characterized. The maximum measured discharge capacities of ZnAl2O4, ZnAl2O4/CTAB, ZnAl2O4/PVP and ZnAl2O4/SDS were 1250, 3000, 3250 and 4000 mAh/g, respectively. These samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), X-ray energy dispersive spectroscopy (EDS), N2 adsorption (BET) and transmission electron microscope (TEM).

Stable and robust nanobiocomposite preparation using aminated guar gum (mimic activity of graphene) with electron beam irradiated polypyrrole and Ce-Ni bimetal: Effective role in simultaneous sensing of environmental pollutants and pseudocapacitor applications

We report a novel sensing platform for biosensor and pseudocapacitor application based on electron beam (EB) irradiated polypyrrole/cerium-nickel@modified guar gum (EB-PPy/Ce-Ni@MGG) nanobiocomposite. The EB irradiated PPy nanospheres (NSs) and Ce-Ni bimetallic NSs prepared are functionalized into the amine MGG matrix film for the improvisation of energy storage as well as charge transfer mechanism. MGG film also found to be an effective conducting material in composite formation like reduced graphene oxide (r-GO) with excellent electrocatalytic activity. The nanobiocomposite was confirmed by SEM, EDAX, XRD, Raman and FT-IR analysis. Interestingly, the EB-PPy/Ce-Ni@MGG modified glassy carbon electrode exhibited an excellent electrocatalytic activity towards the simultaneous sensing of hydroquinone, catechol, resorcinol and nitrite with lower detection limits as 87nM, 84nM, 518nM and 786nM. Furthermore, EB-PPy/Ce-Ni@MGG modified Ni foam electrode was evaluated in 1M NaOH by cyclic voltammetry and galvanostatic charge-discharge methods for pseudocapacitor application. The Ce-Ni bimetal NSs in the EB-PPy@MGG shows a significant improvisation of specific capacitance to 605Fg−1 at a current density of 1Ag−1. The optimized electrolyte concentration, current density, scan rate and cycle stability shows promising results to low cost energy storage with wearable power device fabrication.

Solvothermal synthesis of molybdenum oxide on liquid-phase exfoliated graphene composite electrodes for aqueous supercapacitor application

MoO3–graphene nanocomposites have been prepared through a green and facile synthesis method and serve as the main electrode materials for electrochemical capacitor in mild aqueous electrolyte. First, graphene sheets were synthesized via mild sonication treatment of graphite flakes in an optimum ratio of ethanol and de-ionized water, followed by deposition of MoO3 onto graphene sheets via low-temperature solvothermal treatment using ethylene glycol- de-ionized water as mixed solvent. The composites were characterised using X-ray diffraction, Raman spectroscopy and electron diffraction and the results revealed that α-MoO3 particles were successfully synthesized and anchored homogeneously onto graphene sheets. The electrochemical capacitance properties of MoO3–graphene nanocomposites were measured by cyclic voltammetry, galvanostatic charge discharge method and electrochemical impedance spectroscopy. The results showed that the specific capacitance of MoO3–graphene nanocomposites is 148 F/g, which is much higher than that of pure MoO3 electrodes (84 F/g) in neutral Na2SO3 electrolyte. The specific capacitance is superior to those reported in the literatures using neutral aqueous electrolytes. Moreover, over 81% of the original capacitance was retained after 1600 cycles, indicating a good cycle stability of composite materials. The high specific capacitance and excellent cyclic stability of the electrode is believed originated from the synergistic effect of the highly conductive graphene material and the pseudocapacitive behavior of the MoO3 nanoparticles in neutral electrolyte.

High performance supercapacitor and non-enzymatic hydrogen peroxide sensor based on tellurium nanoparticles

Tellurium nanoparticles (Te Nps) were synthesized by wet chemical method and characterized by XRD, Raman, FESEM, TEM, XPS, UV–Vis and FL. The Nps were coated on graphite foil and Glassy carbon electrode to prepare the electrodes for supercapacitor and biosensor applications. The supercapacitor performance is evaluated in 2M KOH electrolyte by both Cyclic Voltammetry (CV) and galvanostatic charge-discharge method. From charge-discharge method, Te Nps show a specific capacitance of 586F/g at 2mA/cm2 and 100F/g at 30mA/cm2 as well as an excellent cycle life (100% after 1000cycles). In addition, the H2O2 sensor performance of Te Nps modified glassy carbon electrode is checked by CV and Chronoamperometry (CA) in phosphate buffer solution (PBS). In the linear range of 0.67 to 8.04μM of hydrogen peroxide (H2O2), Te NPs show a high sensitivity of 0.83mAmM−1cm−2 with a correlation coefficient of 0.995. The detection limit is 0.3μM with a response time less than 5s.

The influence of dissolved O2 on the electrochemical behaviors of Co-B alloy electrode

The influence of dissolved oxygen on the electrochemical behaviors of the CoB alloy electrode has been investigated by open circuit potential (OCP) measurement and galvanostatic charge-discharge method. It was found that the alloy electrode in oxygen-containing electrolyte has more positive OCP due to the existence of the redox couple O2/OH−. Dissolved oxygen can greatly enhance the high-rate dischargeability of the alloy electrode. Specifically, in oxygen-containing electrolyte, the electrode delivers a reversible discharge capacity of 530mAh/g at 300mA/g and its discharge capacity is still up to 480mAh/g even at a high current density of 1200mA/g. However, in the case of the electrode in oxygen-free electrolyte, its discharge capacity is 438mAh/g at 300mA/g and is reduced to only 234mAh/g at 1200mA/g. Exchange current densities (i0) of the alloy electrode in oxygen-containing and oxygen-free electrolyte are 78mA/g and 54mA/g, respectively. The significant improvement in the high-rate dischargeability of the alloy electrode should be attributed to that oxygen reduction accelerates the kinetics of Co oxidation reaction.

Template-free synthesis of hierarchical mixed-metal cobaltites: Electrocapacitive and Theoretical study

The present work elucidates synthesis and electrocapacitive performance of cobaltites viz. Co3O4, NiCo2O4, ZnCo2O4 and MnCo2O4 nanostructured particles synthesized using template free urea assisted hydrothermal method. Morphology and size of the synthesized cobaltites were examined by using scanning electron microscopy. Hierarchical structures namely fibrous and urchin-like microsphere were observed for the cobaltites. Electrochemical measurements were performed using standard three electrode system with 3M KOH electrolyte via cyclic voltammetry and galvanostatic charge-discharge methods. Amongst the cobaltite studied, NiCo2O4 displayed high surface area (46.05m2/g), high specific capacitance (173F/g at 5mV/s) and energy density (7Wh/kg). The specific capacitance of all the cobaltites decreased with the increase in scan rate. Furthermore, the specific capacitance showed invariance with the current density up to 5A/g. The cyclic stability of NiCo2O4 was studied up to 5,000 cycles and about 76% retention in charge storage capacity was observed. Among all cobaltites, the EIS measurements confirm superior performance of NiCo2O4 as it displays minimum impedance at all frequency. Furthermore, specific capacitance was compared for two and three electrode cells with NiCo2O4 as an electrode material. The hybrid density functional theory (DFT) calculations of the electronic density of states of Co3O4, NiCo2O4, ZnCo2O4 and MnCo2O4 was performed. The DFT calculation predicted narrow band gap for NiCo2O4 (∼1.4eV) which is smallest among all cobaltites studied here in. The superior electrocapacitive behavior of the NiCo2O4 is attributed to high surface area urchin like structure and its high electrical conductivity due to its narrow band gap amongst studied cobaltites.

Improvement of the specific capacitance of V2O5 nanobelts as supercapacitor electrode by tungsten doping

Tungsten doped vanadium pentoxide (W-doped V2O5) nanobelts were successfully synthesized by a facile hydrothermal route and combination of calcination. The results revealed that W atoms were successfully doped into the crystal lattice of V2O5 matrix, indicating that the homogeneous solid-solutions of W-doped V2O5 nanobelts were obtained. The electrochemical properties of W-doped V2O5 nanobelts as supercapacitor electrode were investigated by cyclic voltammetry (CV) and galvanostatic charge discharge (GCD) methods. W-doped V2O5 nanobelts exhibit the excellent capacity and good rate capability. Their specific capacitance are 407, 381, 350, 328, 295 and 273 F g−1 at the current density of 0.5, 1, 2, 5, 10 and 20 A g−1, respectively. W-doped V2O5 nanobelts also show excellent energy densities of 246, 217, 212, 199, 178 and 165 W h kg−1 at a power densities of 0.99, 1.98, 3.96, 9.90, 19.80 and 39.60 kW kg−1. The specific capacitance of W-doped V2O5 nanobelts is much higher than the previous values of V2O5 materials, achieving the aim of improving the specific capacitance of V2O5 nanobelts.

The Use of Spray-Dried Mn3O4/C Composites as Electrocatalysts for Li–O2 Batteries

The electrocatalytic activities of Mn3O4/C composites are studied in lithium–oxygen (Li–O2) batteries as cathode catalysts. The Mn3O4/C composites are fabricated using ultrasonic spray pyrolysis (USP) with organic surfactants as the carbon sources. The physical and electrochemical performance of the composites is characterized by X-ray diffraction, scanning electron microscopy, particle size analysis, Brunauer–Emmett–Teller (BET) measurements, elemental analysis, galvanostatic charge–discharge methods and rotating ring-disk electrode (RRDE) measurements. The electrochemical tests demonstrate that the Mn3O4/C composite that is prepared using Trition X-114 (TX114) surfactant has higher activity as a bi-functional catalyst and delivers better oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalytic performance in Li–O2 batteries because there is a larger surface area and particles are homogeneous with a meso/macro porous structure. The rate constant (kf) for the production of superoxide radical (O2•−) and the propylene carbonate (PC)-electrolyte decomposition rate constant (k) for M3O4/C and Super P electrodes are measured using RRDE experiments and analysis in the 0.1 M tetrabutylammonium hexafluorophosphate (TBAPF6)/PC electrolyte. The results show that TX114 has higher electrocatalytic activity for the first step of ORR to generate O2•− and produces a faster PC-electrolyte decomposition rate.

Electrodeposited Ni(OH)2 nanostructures on electro-etched carbon fiber paper for highly stable supercapacitors

Herein, we introduce a facile, inexpensive and fast, and additive-/template-free method to fabricate highly stable nickel hydroxide nanofibers for supercapacitor applications. Ni(OH)2 nanofibers were electrodeposited on electro-etched carbon fiber paper by a potential step method (Ni(OH)2-ECFs) and characterized using scanning electron microscopy and X-ray diffraction analysis. Electrochemical performance of Ni(OH)2-ECF was studied in symmetric two-electrode assembly by cyclic voltammetry, galvanostatic charge–discharge method, and electrochemical impedance spectroscopy. A specific capacitance of 277.5 F g−1 was achieved for the symmetric supercapacitor based on two identical Ni(OH)2-ECFs. Our findings demonstrate high-rate capability with excellent stability (approximately 100 % capacitance retention) for Ni(OH)2-ECF supercapacitor, originated from the intimate contact between Ni(OH)2 and ECF. Our studies suggest the Ni(OH)2-ECF electrode as an excellent material for supercapacitor applications.

Porous manganese oxide nanospheres for pseudocapacitor applications

Mesoporous, uniform manganese oxide nanosphere thin films were grown on a stainless-steel substrate using the successive ionic layer adsorption and reaction (SILAR) method. The amorphous manganese oxide nanosphere thin films (AMONTFs) were characterized by grazing incidence X-ray diffraction (GI-XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). The GI-XRD analysis reveals that the manganese oxide nanosphere thin films were present in the forms of α-MnO2 and γ-MnO2. XPS demonstrates that the thin films contain a mixture of manganese oxides: MnO2 (Mn4+) and MnOOH (Mn3+). The effect of the number of SILAR cycles on the morphology was observed systemically by FE-SEM and greatly influences the size of these unique nanospheres. The electrochemical properties of the AMONTF electrodes were analyzed by cyclic voltammetry (CV) and the galvanostatic charge-discharge (CD) method. The outcomes of the FE-SEM and electrochemical measurements reveal that the thin film obtained after 60 SILAR cycles has a uniform nanosphere size distribution and large specific capacitance. The manganese oxide thin films exhibit a maximum specific capacitance, energy, and power density of 262.0 F g−1, 18.3 Wh kg−1, and 7999.4 W kg−1, respectively, in an aqueous 1 M Na2SO4 electrolyte solution.

Flower-Like Nickel–Cobalt Oxide Decorated Dopamine-Derived Carbon Nanocomposite for High Performance Supercapacitor Applications

The highly open space flower, coin, peony flower, and leaf-like nickel–cobalt oxide nanostructured materials with and without dopamine as a carbon source (D1.5NiCo2O4, D1.0NiCo2O4 (D-NiCo2O4), D0.5NiCo2O4, and D0.0NiCo2O4 (D- free NiCo2O4)) are prepared by a low temperature chemical synthesis method with improved electrical conductivity, providing the longtime electron pathway, and high surface area for high performance supercapacitors. The structure and morphology of the as-synthesized samples were characterized by X-ray diffraction pattern, X-ray photoelectron spectroscopy, scanning electron microscope, field emission-transmission electron microscope, and N2 adsorption–desorption isotherms. Electrochemical properties of the electrodes were analyzed by cyclic voltammetry and galvanostatic charge–discharge methods. Notably, the as-synthesized flower-like D-NiCo2O4 nanocomposite exhibited a maximum specific capacitance of 667 F g–1, which is superior to D- free NiCo2O4 viz. 202 F g–1 at 5 A g–1 with excell...

Emulsion polymerization method for polyaniline-multiwalled carbon nanotube nanocomposites as supercapacitor materials

Nanocomposites consisting of the conducting polymer, polyaniline (PANI), and multiwalled carbon nanotubes (MWNT) were prepared by in situ emulsion polymerization of aniline monomer on the surface of MWNT, using sodium dodecyl sulfate as an emulsifier and by varying the wt% of the MWNT. The morphology, composition, and thermal stability of the PANI-MWNT nanocomposites and pure PANI were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and field emission electron microscopy (FE-SEM). The PANI-MWNT nanocomposites were found to be crystalline in nature, with the PANI corals grown uniformly on the MWNT. Symmetric supercapacitors were constructed using the PANI-MWNT nanocomposites and pure PANI. Electrochemical analysis of the nanocomposites was performed using cyclic voltammetry and the galvanostatic charge-discharge method. The cyclic voltammetry analysis showed a synergistic increase in the specific capacitance of the PANI-MWNT nanocomposites. The unique structure of the PANI-MWNT nanocomposites led to a high specific capacitance of 240 F g−1 at a current density of 4.0 A g−1, with good rate performance, and 93 % retention of specific capacitance after 5000 CD cycles, indicating their potential as an electrode material for supercapacitors.

A facile hydrothermal synthesis of tungsten doped monoclinic vanadium dioxide with B phase for supercapacitor electrode with pseudocapacitance

Tungsten doped monoclinic vanadium dioxide with B phase (W-doped VO2(B)) was successfully synthesized by a facile hydrothermal route. The composition, structure and morphology were characterized by EDS, element mapping, XRD, XRF and TEM. The results showed that W atom was successfully doped into the crystal lattice of VO2(B) matrix, and the homogeneous solid-solutions of W-doped VO2(B) nanobelts were prepared. The electrochemical properties of W-doped VO2(B) nanobelts as a supercapacitor electrode were investigated by cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) methods. W-doped VO2(B) nanobelts displayed excellent pseudocapacitance property and their specific capacitance were 253, 239, 207, 164 and 148Fg−1 at the current density of 1, 2, 5, 10 and 20Ag−1, respectively. They also exhibited excellent energy densities of 323, 305, 265, 209 and 189Whkg−1 at power densities of 2882, 5758, 14,433, 28,828 and 57,661Wkg−1. The results showed the electrochemical performance of VO2(B) can be greatly improved by W-doped VO2(B).

Improved electrochemical properties of LiFe0.5Mn0.5PO4/C composite materials via a surface coating process

In this work, a LiFe0.5Mn0.5PO4/C (LFMP/C) material was prepared by a simple solid-state ball-mill method by using LiH2PO4, γ-MnO2, and hollow α-Fe2O3 nano-sized materials. Both γ-MnO2 and hollow α-Fe2O3 were synthesized by a hydrothermal process. LFMP/C composites coated with different amounts (1–3wt%) of Li4Ti5O12 (LTO) were synthesized by a sol-gel method. Their typical properties are studied using X-ray diffraction, micro-Raman spectroscopy, scanning electron microscopy/energy-dispersive X-ray spectroscopy, transmission electron microscopy, the AC impedance method, and the galvanostatic charge–discharge method. The results revealed that a 1 wt%-LTO-coated LFMP/C composite shows the highest performance among all LFMP/C composite samples. The long-term cycling performance of the LFMP/C composite improves considerably when the LTO ionic conductor is applied on it. Moreover, the 1 wt%-LTO-coated LFMP/C composite, which has the lowest fading rate, maintains high cycling stability at 1 C (141 mAh g−1) and 10 C (133 mAh g−1) at 55 °C after 100 cycles; by contrast, a bare LFMP/C sample, which demonstrates the highest fading rate, exhibits an unfavorable life cycle, and its discharge capacity decreases rapidly. The ionic conductor coating thus improves the high-temperature performance of LFMP/C composites. A LFMP/C-KS6/SiO2 full cell is assembled and tested.