为了提高锂离子电池用聚烯烃微孔膜的综合性能,在商用Celgard膜表面涂布ZrO2无机涂层,粘结剂选用电池用聚偏氟乙烯.对比分析涂覆前后的隔膜发现,ZrO2涂层可以显著提高Celgard膜的热尺寸稳定性和热熔化温度,对提高锂离子电池安全性起到积极作用.同时无机涂层还能明显改善隔膜对电解液的浸润性,复合隔膜具有更好的保液能力,以涂有ZrO2涂层的Celgard膜作为隔膜组装锂离子电池,可以显著提高长期充放电循环时电池容量保持率.
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