制备了1.1 Ah的18650型LiFePO4/graphite动力电池并研究了温度对电池循环的作用机制.运用解体与非解体的研究手段系统地分析了电池在循环前后的容量以及正负极材料的形貌、结构与电极容量的变化.结果表明,在经过800周循环后55℃下电池的容量衰减显著,循环后电池的Rb与Rct有较为明显的增加.高温下电池的容量衰减主要来自于活性锂离子的损失.对于LiFePO4正极,长周期的循环并未对LiFePO4的结构造成影响,同时电极的容量未见衰减.而对于石墨负极,容量在55℃下有12.60％的衰减.在高温循环后负极表面发现了铁元素的沉积.铁元素的沉积加速了石墨电极表面膜的增厚并对电池容量的衰退产生影响.
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