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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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沉淀剂对聚乙烯表面涂覆聚偏氟乙烯锂离子电池隔膜结构及电化学性质的影响
DOI: 10.11777/j.issn1000-3304.2015.15176, PP. 1299-1306
Keywords: 复合微孔隔膜,聚偏氟乙烯-共-六氟丙烯,热收缩,锂离子电池
Abstract:
为了降低目前商用聚乙烯锂离子电池隔膜在闭孔温度下的热收缩比率、同时提高复合隔膜的电化学性能,通过浸没沉淀法在聚乙烯(PE)隔膜两侧涂覆聚偏氟乙烯-共-六氟丙烯(PVDF-HFP)微孔涂层.通过改变强沉淀剂和弱沉淀剂的比例,研究混合沉淀剂与溶剂的溶度参数差异(Δδ)对于微孔涂层结构的影响.随着Δδ逐渐增加,固-液相分离产生的微孔结构逐渐扩展,涂层由致密表面结构向球状颗粒聚集的微孔结构转变.微孔涂层的结构对于复合隔膜的热收缩比率、电化学性能均有明显的影响.在沉淀剂中水含量40%、60%的条件下,成功地制备出了热收缩显著降低,电导率、循环性能和倍率性能等电化学性能均有所提升的三层复合隔膜.
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