Polyvinyl alcohol (PVA) and zirconium dioxide (ZrO2) were used as the matrix material and the functional filler,respectively.PVA-ZrO2 composite separator for Li-ion battery was prepared by a phase inversion method.The PVA-ZrO2 were characterized by morphology,porosity,electrolyte wettability,heat resistance and electrochemical performances.The effects of ZrO2 filler on the performance of the composite separator were investigated.Results shown that when the solution was consisted of 10% PVA,1.5% ZrO2 particles and 88.5% water,the composite separator possessed excellent electrolyte wettability and thermal stability,the contact angle was only 6° and the electrolyte uptake was 210%.Moreover,the thermal shrinkage was about zero at 160℃.Based on the above advantages,the battery assembled with the optimized composite separator exhibited superior rate capacity retention and cycling capacity retention,for example the discharge capacity at 16C was about 50% of that at 0.2C,and the cycling capacity retention after 100 cycles was about 96.4%,which was obviously better than those of the polyolefin-based separators.
Xiao Wei, Wang Hong, Zhang Kaiyue, Zhang Zhongyu, Liu Jianguo, Yan Chuanwei
. Preparation and performance of PVA-based composite separator for Li-ion battery[J]. New Chemical Materials, 2020
, 48(10)
: 115
-120
.
DOI: 10.19817/j.cnki.issn 1006-3536.2020.10.025
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