二次锂电池用PVDF-HFP/SiO2复合聚合物隔膜的研究

李立1 ;苑克国2 ;张育川1 ;胡塔光1 ;王安邦2 ;杨裕生2

北京化工大学学报(自然科学版) ›› 2006, Vol. 33 ›› Issue (2) : 55-58.

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北京化工大学学报(自然科学版) ›› 2006, Vol. 33 ›› Issue (2) : 55-58.
研究论文

二次锂电池用PVDF-HFP/SiO2复合聚合物隔膜的研究

  • 李立 ;苑克国 ;张育川 ;胡塔光 ;王安邦 ;杨裕生
作者信息 +

Study of PVDF-HFP/SiO2 Composite Polymer Separator for Rechargeable Lithium Battery

  • LiLi1 ;Yuan Ke-guo2 ;Zhang Yu-chuan1 ;Hu Ta-guang1 ;Wang An-bang2 ;Yang Yu-sheng2
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文章历史 +

摘要

采用倒相法制备了二次锂电池用的聚偏氟乙烯–六氟丙烯复合聚合物(PVDF-HFP/SiO2)隔膜,测定了它的吸液率、电导率、机械强度等性能,并通过扫描电镜对其形貌进行了分析。研究结果表明, PVDF-HFP/SiO2隔膜具有较高的吸液率、电导率和韧性:电解质吸收率达184.4%、
室温电导率为1.20mS/cm、断裂伸长率高达163%。利用PVDF-HFP/SiO2隔膜装配的二次锂电池的首放比容量为834.8mAh/g,第40次的放电比容量达到400mAh/g, 循环效率达到99.8%以上,表现出良好的电化学性能。

Abstract

A polymer (PVDF-HFP) separator and a composite polymer (PVDF-HFP/SiO2) separator were prepared by the phase-inversion method. The electrolyte uptake, conductivity and mechanical properties of the separators were studied, and the corresponding micro-structures were examined by SEM. The PVDF-HFP/SiO2 separator exhibits much higher electrolyte uptake, conductivity and ductibility with an electrolyte uptake volume of 184.4%, a conductivity of 1.2 mS/cm and ductibility of 163%. When the PVDF-HFP/SiO2 separator is employed in a lithium battery a good cycle performance and a high cycling fficiency are observed. The first discharge specific capacity is 834.8 mAh/g, the 40th cycle discharge capacity is 400 mAh/g and the average charge/discharge efficiency is above 99.8%.

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李立1 ;苑克国2 ;张育川1 ;胡塔光1 ;王安邦2 ;杨裕生2. 二次锂电池用PVDF-HFP/SiO2复合聚合物隔膜的研究[J]. 北京化工大学学报(自然科学版), 2006, 33(2): 55-58
LiLi1 ;Yuan Ke-guo2 ;Zhang Yu-chuan1 ;Hu Ta-guang1 ;Wang An-bang2 ;Yang Yu-sheng2. Study of PVDF-HFP/SiO2 Composite Polymer Separator for Rechargeable Lithium Battery[J]. Journal of Beijing University of Chemical Technology, 2006, 33(2): 55-58

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