Al2O3陶瓷改性隔膜的安全性能

Safety performance of Al2O3 ceramic modified separator

以聚乙烯(PE)隔膜和Al2O3陶瓷涂覆改性PE隔膜组装软包装锂离子电池。通过SEM、热收缩、穿刺、外短路和过充等测试,研究Al2O3陶瓷涂覆改性PE隔膜的安全性能PE隔膜经Al2O3陶瓷涂覆改性后,耐热性能和浸润性能提升,组装的电池在穿刺测试中最高温度仅135t,外短路和过充测试表现也更好。改性隔膜组装的电池在室温下于2.75-4.20V以0.5C充电、1.0C放电循环555次,容量保持率在90.86%以上,80%放电深度预计寿命在1200次以上。

By using polyethylene (PE) separator and Al2O3 ceramic modified PE separator, soft pack Li-ion batteries were assembled. The safety performance of Al2O3 ceramic modified PE separator was studied by SEM, thermal shrinkage, punch, short circuit and overcharge experiments. The heat resistance and infiltration performance of PE separator were improved after coating Al2O3 ceramic particles. A maximum temperature of only 135 was reached in the punch test of the battery assembled with Al2O3 ceramic modified PE separator, which had better performance in short circuit and overcharge tests. The capacity retention rate of battery assembled with modified separator was above 90. 86% after cycling 555 times with 0.5C charge and 1.0C discharge in 2.75-4.20V at room temperature, the budget life exceed 1 200 times at 80% depth of discharge.