Covalently-Bonded Poly(vinyl alcohol)-Silica Composite Nanofiber Separator with Enhanced Wettability and Thermal Stability for Lithium-Ion Battery

被引：20
作者：
Chen, Shilin [1 ]
Zhang, Zhixiong [1 ]
Li, Li [2 ]
Yuan, Wenhui [1 ]
机构：
[1] South China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510640, Guangdong, Peoples R China
[2] South China Univ Technol, Coll Environm Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China
来源：
CHEMISTRYSELECT | 2018年 / 3卷 / 47期
关键词：
electrospinning; lithium-ion batteries; nanofiber membrane; thermal stability; wettability; ELECTROCHEMICAL PERFORMANCE; POLYETHYLENE SEPARATORS; POLYPROPYLENE SEPARATOR; POLYMER ELECTROLYTE; MEMBRANE; SHRINKAGE;
D O I：
10.1002/slct.201802794
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Covalently-bonded poly(vinyl alcohol)-silica (PVA-SiO2) composite nanofiber membranes are fabricated via sol-gel electrospinning and their physical and electrochemical properties are investigated for application as separators in lithium-ion batteries (LIBs). Experimental results demonstrate the PVA-SiO2 membranes possess a unique three-dimensional interconnected porous structure and display higher porosity (73%), better electrolyte affinity, higher electrolyte uptake (405%) and lower thermal shrinkage compared to commercial polypropylene (PP) membranes. In addition, batteries using PVA-SiO2 composite nanofiber membranes as separators exhibit enhanced ionic conductivity (1.81 mS cm(-1)), superior cycling stability and C-rate performance than those using PP separators. These findings reveal that the PVA-SiO2 composite nanofiber membrane might be a promising alternative to commercial polyolefin separator for high performance LIBs.
引用
收藏
页码：13365 / 13371
页数：7
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