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一种可为锂二次电池提供过热保护的正温度敏感系数电极 被引量：6

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摘要 通过将导电碳黑（carbon black，CB）SuperP均匀地分散到聚甲基丙烯酸甲酯（poly（methyl methacrylate），PMMA）的聚合物基质中，发展出了一种具有正温度敏感系数（positive temperature coefficient，PTC）特征的CB—PMMA复合材料，并采用该复合材料为铝箔基体的表面涂层，制备出具有三明治结构的A1／PTC／LiCoO2阴极．通过循环伏安扫描、倍率充放电和交流阻抗等方法考察了PTC复合电极在常温和高温下的电化学性能．实验结果表明，PTC—LiCoO2电极在常温下具有高的充放电比容量、良好的倍率性能和循环稳定性，PTC涂层对LiCoO2电极的正常充放电没有产生明显的不利影响．但在80～120℃的高温下，PTC涂层因电阻急剧增大约2个数量级，限制了电极活性层与集流体之间的电流传输，导致电极容量的急剧下降，表现出良好的自激发热阻断效果，从而可以防止电池因热失控而引发的安全性问题．
作者 夏兰 朱利敏 张海燕 艾新平
机构地区 武汉大学化学与分子科学学院湖北省化学电源材料与技术重点实验室
出处 《科学通报》 EI CAS CSCD 北大核心 2012年第27期2632-2636,共5页 Chinese Science Bulletin
基金 国家重点基础研究发展计划(2009CB220100) 国家高技术研究发展计划(2011AA11A256,2011AA11A254) 中央高校基本科研业务费专项资金资助
关键词 锂离子电池 正温度系数 安全性 聚甲基丙烯酸甲酯 热失控
分类号 TM912 [电气工程—电力电子与电力传动]
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参考文献26

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二级参考文献20

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共引文献2

同被引文献88

  • 1何雨石,裴力,马紫峰.层状结构Li[Ni,Co,Mn]O_2正极材料制备与改性研究进展[J].化工进展,2007,26(3):337-344. 被引量：8
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引证文献6

二级引证文献42

科学通报
2012年 第27期

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