Study on Electrochemical Performance and Electrode Reaction Kinetics of Lithium Vanadium Phosphate/Carbon Composites in Lithium-Ion Batteries AITranslate

3徐换换,柯义虎.Cu-Zr复合氧化物催化耦合甘油和CO_(2)合成碳酸甘油酯[J].燃料化学学报（中英文）,2024,52(2):171-183.

4邓帅磊,王博,孙明旭,夏云云,陈静.Pr掺杂Sm_(0.5)Sr_(0.5)CoO_(3)阴极的性能研究[J].化工新型材料,2024,52(2):160-165.

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Chinese Library Classification Number:TB34[一般工业技术—材料科学与工程]

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Compared with the Li₃V₂(PO₄)₃/C(LVP/C-S)prepared by sol-gel method,the Li₃V₂(PO₄)₃/C(LVP/C-R)composite cathode material prepared by hydrothermal ultrasonic-assisted rheological phase method combined with solution deposition method has better electrochemical performance.The synthesized materials were characterized by XRD,SEM and Raman spectroscopy.The synthesized materials were used as cathodes of lithium-ion batteries to assemble half-cells for rate and cycling performance tests,while the electrode reaction kinetics were analyzed by cyclic voltammetry,electrochemical impedance,and galvanostatic intermittent titration technique.The results show that the Li₃V₂(PO₄)₃(LVP-R)synthesized by hydrothermal ultrasonic-assisted rheological phase method is coated with a carbon layer by solution deposition,leading to an increase in the crystal plane spacing,a smaller particle size,an increase in the electrical conductivity and tap density,and a significant enhancement in the dispersion.This facilitates the insertion/extraction of Li⁺in the cathode material and shortens the diffusion path of Li⁺,resulting in improved rate performance,coulombic efficiency and cycling stability of lithium-ion batteries.As the cathode material of lithium-ion batteries,LVP/C-R exhibits a high initial discharge specific capacity(160.12 mA·h/g)at a current density of 0.1 C,and the discharge capacity retention rate is 89.16%after 200 cycles at a current density of 1 C,which is much higher than that of LVP/C-S.In addition,LVP/C-R has a larger apparent Li⁺-diffusion coefficient and better kinetic performance in lithium-ion batteries compared to LVP/C-S and LVP-R.