水性粘结剂羧甲基纤维素钠对锂离子电池钛酸锂负极性能的影响

Influence of CMC water-soluble binder on electrochemical performance of Li4Ti5O12 cathode-based Li-ion battery

采用扫描电镜、充放电测试和循环伏安等方法研究了水性粘结剂羧甲基纤维素钠(CMC)对锂离子电池钛酸锂负极片形貌及脱嵌锂性能的影响。结果表明:CMC用量对钛酸锂负极片的微观形貌、首次充放电比容量、库仑效率和循环性能都有一定程度的影响。当极片中CMC粘结剂的质量含量为10%时,钛酸锂极片呈现出均匀的微观形貌结构;同时也展现出最佳的电化学性能,在0.5~3.0V,0.5C条件下充放电,首次放电比容量为170.7mAh/g,首次库伦效率为92.97%,经历100次循环以后仍然有147.2mAh/g的比容量。

The effect of water-soluble binder carboxymethylcellulose sodium(CMC)on Li4Ti5O12 cathode were systematically investigated by scanning electron microscope(SEM),galvanostatic charge-discharge tests,and cycling voltammetry(CV).Accroding to the experimental results,the micro morphology,initial charge/discharge specific capacity,initial coulombic efficiency,and the cycling performance of Li4Ti5O12 differed under different CMC concentration.The Li4Ti5O12 with 10 wt%.CMC exhibited uniform microstructure,and showed an excellent electrochemical performance,with the initial discharge specific capacity of 170.7 mAh/g,the initial Coulombic efficiency of 92.97%,and the reversible specific capacity of 147.2 mAh/g after 100 cycles,when charged-discharged at the current density of 0.5 Cin 0.5~3.0 V.