石墨负极的压实密度对软包锂离子电池性能的影响

摘要

石墨负极的压实密度是影响锂离子电池循环性能和倍率放电性能的主要因素之一。通过研究3种不同压实密度的石墨负极材料的电化学性能，发现随着压实密度的增大，负极极片的吸液时间逐渐延长，电池的内阻也在不断地增加。当负极压实密度为1.7 g/cm³时，锂离子电池的循环性能和倍率性能均为最佳。电池在0.5 C下放电循环500次后的容量保持率为86.8%，3.0 C倍率的放电容量为0.2 C放电容量的95.1%。

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	江欢
	徐强
	孟繁慧
	周江
	高俊奎

关键词：锂离子电池；石墨；负极；压实密度；电池性能

Abstract：

Compaction density of graphite anode is one of the main factors on the cycle performance and rate performance of lithium ion batteries. The electrochemical performances of three kinds of graphite anode with different compaction density are conducted in this article. Both the resistance of cell and the absorption time of electrolyte have increased with increasing the compaction density of graphite anode. Among these batteries with different compaction density of graphite anode, the cycle performance and rate performance with a compaction density of 1.7 g/cm³ is the best. After 500 cycles at 0.5 C discharge, the capacity retention ratio of battery with a compaction density of 1.7 g/cm³ is 86.8%. The 3.0 C discharge capacity retains 95.1% of 0.2 C discharge capacity.

Keywords： lithium-ion batteries； graphite； anode； compaction density； battery performance

Received 2015-04-08;

Corresponding Authors: 徐强,E-mail:xuqiang@tju.edu.cn。 Email: xuqiang@tju.edu.cn

About author: 江欢(1990-),男,硕士研究生,研究方向为新型化学电源。

引用本文:

江欢, 徐强, 孟繁慧, 周江, 高俊奎.石墨负极的压实密度对软包锂离子电池性能的影响[J]. 化学工业与工程, 2017,34(2): 68-72

Jiang Huan, Xu Qiang, Meng Fanhui, Zhou Jiang, Gao Junkui.Effects of Compaction Density of Graphite Anode on Performance of Lithium-Ion Battery with Soft Package[J]. Chemcial Industry and Engineering, 2017,34(2): 68-72

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