储能科学与技术 ›› 2017, Vol. 6 ›› Issue (4): 806-809.doi: 10.12028/j.issn.2095-4239.2017.0102

• 研究开发 • 上一篇    下一篇

羧基纤维素钠在锂离子电池中的应用

黄庆华,秦  杏,张  娜   

  1. 天津力神电池股份有限公司,天津 300384
  • 收稿日期:2017-05-14 修回日期:2017-06-20 出版日期:2017-07-01 发布日期:2017-07-01
  • 通讯作者: 张娜,博士,高级工程师,E-mail:Zhangna@lishen.com.cn。
  • 作者简介:黄庆华(1977—),男,博士,工程师,主要研究方向为锂离子电池,E-mail:hqh0583@163.com

The use of sodium carboxymethyl cellulose in lithium-ion batteries

HUANG Qinghua, QIN Xing, ZHANG Na   

  1. Tianjin Lishen Battery Joint-Stock Co., Ltd., Tianjin 300384, China
  • Received:2017-05-14 Revised:2017-06-20 Online:2017-07-01 Published:2017-07-01

摘要: 通过两种结构参数的水溶性黏结剂羧甲基纤维素钠(CMC)应用于锂离子电池,研究了对石墨负极浆料稳定性及电化学性能的影响。结果表明:取代度较大(0.85)、分子量高(650000)的CMC比更低取代度(0.65)和分子量(250000)的CMC具有较好的溶解性和更高的黏度,更容易完全吸附在石墨颗粒表面。吸附的CMC之间的相互斥力使石墨颗粒在水溶液中分散均匀,从而有利于负极浆料体系的稳定和涂布,使锂离子电池具有较好的电化学性能。

关键词: 羧甲基纤维素钠(CMC), 取代度, 分子量, 石墨负极, 电化学性能

Abstract: The influence of water-soluble binder, sodium carboxymethyl cellulose (CMC) with two different structures, was investigated on the stability of graphite anode slurry for lithium-ion batteries and the associated electrochemical performance. CMC with a higher degree of substitution (DS) of 0.85 and a higher molecular mass of 650000 was found to be adsorbed more on the graphite particle surface compared with a lower DS of 0.65 and a lower molecular mass of 250000. This was attributed to higher viscosity and better solubility of the higher DS and molecular mass. Based on repulsive interactions between the adsorbed CMC, the graphite particles were well dispersed in the aqueous medium. It was concluded that a high DS with a high molecular mass would improve the stability of graphite anode slurries and hence enhance the electrochemical performance of Lithium-ion batteries.

Key words: sodium carboxymethyl cell, degree of substitution, molecular weight, graphite anode, electrochemical performance