The fabrication of Li3VO4/Ni composite material and its electrochemical performance as anode for Li-ion battery
The fabrication of Li3VO4/Ni composite material and its electrochemical performance as anode for Li-ion battery
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Li3VO4/Ni复合材料的制备及其作为锂离子电池负极的电化学性能
DOI：
10.1016/j.electacta.2014.03.120
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发表时间：
2014-06-01
影响因子：
6.6
通讯作者：
Zhang, Lulu
中科院分区：
文献类型：
--
作者：
Ni, Shibing;Lv, Xiaohu;Zhang, Lulu
在多孔泡沫镍上成功地生长了均匀的Li3VO4薄膜，由于反应动力学的改善，该薄膜表现出了良好的电化学性能。所制备的Li3VO4/Ni电极在0.3C的充放电倍率下循环100次后的放电和充电容量分别为379和378mAhg(-1)，在0.4~15C的不同充放电倍率下，Li3VO4/Ni电极的放电容量可恢复到404mAhg(-1)，当充放电倍率降至0.4C时，Li3VO4/Ni电极的放电容量可恢复到404mAhg(-1)。阳极/阴极峰电流与扫描速度平方根的线性关系表明Li3VO4/Ni电极在充放电过程中为锂离子扩散控制机制，两条直线的对称斜率表明锂离子在锂/镍电极上的充放电过程是高度可逆的。电化学阻抗谱测试表明，Li3VO4/Ni电极在循环过程中接触电阻和电荷转移电阻较低且稳定，表明锂离子扩散系数和电荷转移过程非常稳定。(C)2014爱思唯尔有限公司。保留所有权利。
Uniform Li3VO4 film was successfully grown on porous Ni foam, which shows good electrochemical performance as anode for Li-ion battery due to the improved reaction kinetics. The as-prepared Li3VO4/Ni electrode can deliver discharge and charge capacity of 379 and 378 mAh g(-1) after 100 cycles at a charge/discharge rate of 0.3 C. After various charge/discharge rates from 0.4 to 15 C, the discharge capacity of the Li3VO4/Ni electrode can restore to 404 mAh g(-1) when lowering the charge/discharge rate to 0.4 C. The reaction kinetics of the Li3VO4/Ni electrode was studied by cyclic voltammetry (CV) measurement at various scan rate and electrochemical impedance spectroscopy (EIS). Linear dependence between anodic/cathodic peak currents and the square root of scan rate suggests a lithium ion diffusion controlled mechanism of Li3VO4/Ni electrode in charge/discharge process, and the symmetrical slope of the two straight lines indicates a highly reversible lithiation/delithiation process. EIS measurements of the Li3VO4/Ni electrode show low and stable contact and charge-transfer resistances in cycling, suggesting highly stable charge transfer process and Li-ion diffusion coefficient. (C) 2014 Elsevier Ltd. All rights reserved.