铜箔对动力锂离子电池性能的影响

doi:10.19799/j.cnki.2095-4239.2020.0097

储能科学与技术 ›› 2020, Vol. 9 ›› Issue (S1): 1-6.doi: 10.19799/j.cnki.2095-4239.2020.0097

铜箔对动力锂离子电池性能的影响

高蕾(), 孟玉凤, 颜琪斌, 杨慧

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:2020-03-09 修回日期:2020-05-01 出版日期:2020-12-05 发布日期:2020-12-02
通讯作者: 高蕾 E-mail:59637669@qq.com
作者简介:高蕾（1976—），女，硕士，研究员，主要研究方向为锂离子电池技术，E-mail：59637669@qq.com。

The influence of copper foil appearance quality on Li-ion power battery performance

Lei GAO(), Yufeng MENG, Qibin YAN, Hui YANG

State Key Laboratory of Space Power Technology, Shanghai Institute of Space Power Sources, Shanghai 200245, China

Received:2020-03-09 Revised:2020-05-01 Online:2020-12-05 Published:2020-12-02
Contact: Lei GAO E-mail:59637669@qq.com

摘要/Abstract

摘要：

本工作研究了微观形貌不良的铜箔对于动力锂离子电池性能的影响。通过扫描电镜对比结果发现，不良铜箔表面有斑点状裂纹。采用不同铜箔制作试验电池，分析了电池的电化学阻抗谱(EIS)、低温、常温以及循环性能。根据EIS拟合结果，不良铜箔和正常铜箔试验电池的欧姆阻抗分别为31.95 mΩ和11.78 mΩ。不良铜箔的低温倍率性能以及循环性能明显低于正常铜箔。通过剖析发现，不良铜箔制作的新鲜负极片以及电池解剖后的负极片，都有严重的极膜脱落现象。

关键词: 铜箔, 动力锂离子电池, 低温性能

Abstract:

The influence of copper foil microscopic appearance on Li-ion battery performance was discussed. Scanning electron microscope (SEM) results showed that there was a spot-like flaw on the defective copper film. Soft-package battery was prepared with the defective and qualified copper foils, respectively. The batteries' performance was evaluated, including electrochemical impedance spectra (EIS) analysis,discharging at both low temperature and room temperature, and cycle performance. It has been concluded from the EIS simulation result that the defective copper foil could have a severe influence on ohm impedance values, which are 31.95 mΩ and 11.78 mΩ for defective and qualified copper film, respectively. Besides, the low-temperature discharge and cycle performance of defective copper film batteries are inferior to that of the qualified copper film battery. It was also found from the disassembled battery that the anode electrode coated by the defective copper foil has poor adherence. The phenomenon also happened in the freshly prepared anode electrode.

Key words: copper foil, Li-ion power battery, low temperature discharge

中图分类号:

TM 911

高蕾, 孟玉凤, 颜琪斌, 杨慧. 铜箔对动力锂离子电池性能的影响[J]. 储能科学与技术, 2020, 9(S1): 1-6.

Lei GAO, Yufeng MENG, Qibin YAN, Hui YANG. The influence of copper foil appearance quality on Li-ion power battery performance[J]. Energy Storage Science and Technology, 2020, 9(S1): 1-6.

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参考文献 4

1	陈朝阳, 章金晶, 杭先霞, 等, 锂离子电池用电解铜箔的择优取向[J]. 电源技术, 2010, 34(7): 647-649.
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类别	编号	首次充电容量/mA·h	首次放电容量/mA·h	化成效率/%	容量/mA·h	内阻/mΩ
正常铜箔	1	5194	4704	90.57	4697	2.441
	2	5200	4702	90.42	4697	2.439
	3	5187	4690	90.42	4687	2.506
不良铜箔	1	5215	4679	89.72	4683	2.507
	2	5235	4689	89.57	4695	2.517
	3	5206	4668	89.67	4672	2.51

阻抗	NGCu	OKCu
R_s/mΩ	31.95	11.78
R_ct/mΩ	4.76	1.99
R_sei/mΩ	3.35	3.21

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铜箔对动力锂离子电池性能的影响

The influence of copper foil appearance quality on Li-ion power battery performance

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