化工新型材料

化工新型材料 ›› 2020, Vol. 48 ›› Issue (10) : 115-120. DOI: 10.19817/j.cnki.issn 1006-3536.2020.10.025

新材料与新技术

PVA基复合锂电隔膜的制备及性能研究

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Preparation and performance of PVA-based composite separator for Li-ion battery

Xiao Wei^1,3, Wang Hong¹, Zhang Kaiyue¹, Zhang Zhongyu², Liu Jianguo¹, Yan Chuanwei¹

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摘要

以聚乙烯醇(PVA)和二氧化锆(ZrO₂)为成膜骨架材料和功能填料,利用相转化法制备PVA-ZrO₂复合微孔锂电隔膜。通过微观形貌、孔隙率、电解液亲和性、耐热性及电化学性能等对其进行表征,考察ZrO₂添加量对隔膜性能的影响,并评价隔膜的电池循环性能和倍率性能。结果表明,当PVA的浓度为10%、ZrO₂的添加量为1.5%时,复合隔膜的电解液润湿性和热稳定性较好,其电解液接触角仅为6°,吸液率达到210%,160℃下热收缩率几乎为0。该隔膜装配电池的倍率容量和循环容量保持性优异,16C电流下的放电容量为0.2C电流的50%,循环100次后容量保持约96%,优于聚烯烃隔膜。

Abstract

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.

关键词

聚乙烯醇 / 二氧化锆 / 隔膜 / 润湿性 / 耐热性 / 电化学性能

Key words

PVA / ZrO₂ / separator / electrolyte wettability / thermal resistance / electrochemical performance

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PVA基复合锂电隔膜的制备及性能研究[J]. 化工新型材料, 2020, 48(10): 115-120 DOI:10.19817/j.cnki.issn 1006-3536.2020.10.025

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原文顺序 | 出版日期 | 本文引用

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Received		Published
		2020-10-20
Issue Date
2020-10-20

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