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 10wt%.CMC exhibited uniform microstructure,and showed an excellent electrochemical performance,with the initial discharge specific capacity of 170.7mAh/g,the initial Coulombic efficiency of 92.97%,and the reversible specific capacity of 147.2mAh/g after 100cycles,when charged-discharged at the current density of 0.5C in 0.5～3.0V.
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基金资助
国家重点研发计划(2018YFB0104400);广东省质量技术监督局科技项目(2017CZ09);广东省质量技术监督局科技项目(2018PZ10)
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