储能科学与技术 ›› 2019, Vol. 8 ›› Issue (1): 123-129.doi: 10.12028/j.issn.2095-4239.2018.0146

• 研究及进展 • 上一篇    下一篇

碳负极黏结剂对于动力锂离子电池性能的影响

高蕾, 程广玉, 顾洪汇, 王可   

  1. 空间电源技术国家重点实验室, 上海空间电源研究所, 上海 200245
  • 收稿日期:2018-09-07 修回日期:2018-09-17 出版日期:2019-01-01 发布日期:2018-10-30
  • 通讯作者: 高蕾(1976-),女,高级工程师,主要研究方向为锂离子电池,E-mail:59637669@qq.com。
  • 作者简介:高蕾(1976-),女,高级工程师,主要研究方向为锂离子电池,E-mail:59637669@qq.com。

Influence of graphite anode binder on the high power Li-ion battery performance

GAO Lei, CHENG Guangyu, GU Honghui, WANG Ke   

  1. State Key Laboratory of Space Power Technology, Shanghai Institute of Space Power Sources, Shanghai 200245, China
  • Received:2018-09-07 Revised:2018-09-17 Online:2019-01-01 Published:2018-10-30

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摘要： 本文研究了油性体系的聚偏氟乙烯（PVDF）和水溶性体系的丁苯橡胶和羧甲基纤维素钠（SBR-CMC）对于动力锂离子电池性能的影响。通过差示扫描量热法（DSC）测试了PVDF、SBR以及CMC的玻璃化转变温度，结果分别为-51.7℃、-42.18℃和-55.82℃。通过软包装试验电池，对比了两种黏结剂对于动力锂离子电池性能包括化成分容、大倍率放电、低温放电以及循环性能等的影响。结果发现，两种黏结剂体系的试验电池在常温下的容量发挥、功率性能以及循环寿命没有明显区别，但是在低温（-40℃）的放电性能的差别较大，并且随着放电电流加大，这种差别会进一步增大。分别在20℃和-40℃下以0.5 C放电、在-40℃下1 C放电，水性黏结剂体系电池与油性体系电池放电容量比分别为1.004、0.706和0.589。

关键词: 动力锂离子电池, 负极, 低温, 黏结剂, 玻璃化转变温度

Abstract: Applying styrene butadiene rubber-carboxymethyl cellulose (SBR-CMC) and polyvinylidene fluoride (PVDF) as anode binder, respectively, the influence of different anode binders on the high power li-ion battery performance was researched. Glass transition temperature of PVDF, SBR and CMC was tested by the method of differential scanning calorimetry (DSC), and the values were -51.7℃, -42.18℃ and -55.82℃, respectively. Pouch cells were prepared with the two kinds of binder. The rate performance testing result showed no obvious difference at room temperatures. However, due to the different glass-transition temperature of the two binders, the sample cells with PVDF binder exhibited superior performance in low temperature discharge. The cells were discharged at 0.5 C at the temperature of 20℃ and -40℃, and 1 C at -40℃, respectively, the discharge capacity ratio of cell with SBR-CMC binder to that of the with PVDF binder cell were 1.004, 0.706 and 0.589.

Key words: high power Li-ion battery, anode, low temperature, binder, glass-transition temperature

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