Enhanced Wettability of a PTFE Porous Membrane for a High-Temperature Stable Lithium-Ion Battery Separator

被引：10
作者：
Guo, Hongxia [1 ]
Li, Mingye [1 ]
Li, Fan [2 ]
Zhu, Qizhen [3 ]
Zhao, Yao [1 ]
Wang, Feng [2 ]
Qin, Zhenping [2 ]
机构：
[1] Beijing Univ Technol, Fac Mat & Mfg, Nanmofang St,Pingleyuan 100, Beijing 100124, Peoples R China
[2] Beijing Univ Technol, Fac Environm & Life, Nanmofang St,Pingleyuan 100, Beijing 100124, Peoples R China
[3] Beijing Univ Chem Technol, Beijing Key Lab Electrochem Proc & Technol Mat, State Key Lab Organ Inorgan Composites, Beisanhuan East Rd 15, Beijing 100029, Peoples R China
来源：
CHEMICAL ENGINEERING & TECHNOLOGY | 2022年 / 45卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Electrochemical performance; Li-ion battery separator; Poly(tetrafluoroethylene) membrane; Wettability; ELECTROCHEMICAL PERFORMANCE; POLYPROPYLENE SEPARATORS; SURFACE MODIFICATION; THERMAL-STABILITY; ELECTROLYTE; CHALLENGES; THIN;
D O I：
10.1002/ceat.202000218
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
A hydrophobic poly(tetrafluoroethylene) (PTFE) porous membrane was modified into a hydrophilic lithium-ion battery (LIB) separator with a higher affinity to the electrolyte via the hybrid consisting of a cationic fluorocarbon surfactant (FCS), polyethylenimine (PEI), and tetraethyl orthosilicate (TEOS), which can be in-situ biomineralized into SiO2 nanoparticles. The obtained PTFE/FCS-PEI-SiO2 separator showed a dynamic electrolyte contact angle, which decreased from 50.3 degrees to 0 degrees within 4 s, along with 215 % of electrolyte uptake. The ionic conductivity and the interfacial resistance were 9.12 mS cm(-1) and 228.8 omega, respectively. In addition, the cell equipped with the separator showed a capacity of 163.7 mAh g(-1) at a current density of 0.2 C. Notably, the cell with the separator displayed good high-temperature stability.
引用
收藏
页码：737 / 744
页数：8
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