Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第21卷    第11期    总第152期    2011年11月

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文章编号:1004-0609(2011)11-2812-07
锰酸锂电池储存后容量衰减机理
刘云建1, 2, 3, 宋 杨1, 魏洪兵1, 王彩娟1, 赵 永1, 金 挺1, 李新海3, 郭华军3

(1. 吴江出入境检验检疫局,吴江 215200;2. 江苏大学 材料科学与工程学院,镇江 212013;
3. 中南大学 冶金科学与工程学院,长沙 410083
)

摘 要: 采用商品化的LiMn2O4制作锰酸锂/石墨电池,研究其储存性能,并对储存前后的正极、负极和电解液进行表征分析。结果表明:半荷电常温储存一个月,电池容量衰减3.7%,循环性能得到改善。X射线衍射和透射电镜结果表明:LiMn2O4晶格发生收缩,正极表面形成一层固体电解质(SEI)膜。交流阻抗研究表明:正极阻抗由储存前的62.69 Ω增大到储存后的84.64 Ω,负极阻抗由储存前的183.1 Ω增大到储存后的301 Ω。红外光谱分析表明:电解液溶剂和电解质盐均不同程度地发生了分解,锰酸锂电池储存后容量衰减主要是由电极极化、Mn溶解、电解液分解、负极SEI膜增厚等原因造成。

 

关键字: 锰酸锂电池;储存;容量衰减;机理

Capacity fading mechanism of LiMn2O4 cell after storage
LIU Yun-jian1, 2, 3, SONG Yang1, WEI Hong-bing1, WANG Cai-juan1, ZHAO Yong1, JIN Ting1, LI Xin-hai3, GUO Hua-jun3

1. Wujiang Entry-Exit Inspection and Quarantine Bureau, Wujiang 215200, China;
2. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China;
3. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:The power battery was manufactured with the commercial LiMn2O4 and graphite. The storage performance of LiMn2O4 battery was tested. The cathode, anode and electrolyte before and after storage were characterized. The result shows that the capacity fading ratio of LiMn2O4 battery at half-charged state is 3.7%, but the cycling performance is improved after storage. XRD results show that the crystal lattice of LiMn2O4 shrinks. TEM results show that the surface of LiMn2O4 particles is covered with SEI film. The cathode impedance increases from 62.69 Ω to 84.64 Ω and that of anode increases from 183.1 Ω to 301 Ω. FT-IR results show that the solvent and solutes of electrolyte decompose at a certain degree after storage. The polarization, Mn dissolution, electrolyte decomposition and the incrassation of anode SEI are responsible for the capacity fading of LiMn2O4 battery after storage.

 

Key words: LiMn2O4 battery; storage; capacity fading; mechanism

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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