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安电能源解析冬天为什么锂电池容量会变低

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对于影响锂离子电池低温性能决定性因素的探讨


专家观点一:电解液对锂离子电池低温性能的影响最大,电解液的成分及物化性能对电池低温性能有重要影响。电池低温下循环面临的问题是:电解液粘度会变大,离子传导速度变慢,造成外电路电子迁移速度不匹配,因此电池出现严重极化,充放电容量出现急剧降低。尤其当低温充电时,锂离子很容易在负极表面形成锂枝晶,导致电池失效。

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电解液的电导率与电解液的组成成分有关,减小溶剂的粘度是提高电解液电导率的途径之一。溶剂低温下溶剂良好的流动性是离子运输的保障,而低温下电解液在负极所形成的固体电解质膜也是影响锂离子传导的关键,且RSEI为锂离子电池在低温环境下的主要阻抗。

专家二:限制锂离子电池低温性能的主要因素是低温下急剧增加的Li+扩散阻抗,而并非SEI膜。

锂离子电池正极材料的低温特性

层状结构正极材料的低温特性

CENGZHUANGJIEGOU,JIYONGYOUYIWEILILIZIKUOSANTONGDAOSUOBUKEBINIDEBEILVXINGNENG,YOUYONGYOUSANWEITONGDAODEJIEGOUWENDINGXING,SHIZUIZAOSHANGYONGDELILIZIDIANCHIZHENGJICAILIAO。QIDAIBIAOXINGWUZHIYOULiCoO2、Li(Co1-xNix)O2HELi(Ni,Co,Mn)O2DENG。

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