分离器(采油)
材料科学
六氟丙烯
电解质
电化学
静电纺丝
化学工程
离子电导率
复合数
锂离子电池
热稳定性
锂电池
膜
氟化物
电化学窗口
复合材料
离子
电池(电)
聚合物
无机化学
化学
离子键合
电极
有机化学
物理化学
工程类
功率(物理)
物理
热力学
四氟乙烯
量子力学
生物化学
共聚物
作者
Tian Liang,Wei‐Hua Liang,Jianhua Cao,Dayong Wu
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-02-11
卷期号:4 (3): 2578-2585
被引量:32
标识
DOI:10.1021/acsaem.0c03162
摘要
The development of high energy density lithium ion batteries puts forward requirements for separators. In this article, poly(vinylidene fluoride-hexafluoropropylene)/Li1.5Al0.5Ge1.5(PO4)3 composite membrane (PL) has been fabricated by electrospinning and with use of the dip-coating method as the separator of the lithium ion battery. With reference to the physical properties, PL has better mechanical strength than does its base membrane electrospun poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP), and thermal stability and electrolyte uptake (215%) higher than those of the PP separator; with reference to the electrochemistry parameters, PL has an ionic conductivity of up to 3.18 mS cm–1 at RT and a wide electrochemical window of 5.3 V (vs Li+/Li). The NCM811||Li battery that uses the PL separator exhibits a longer cycle life (144.7 mAh g–1 after 500 cycles at 0.2 C), a lower interfacial resistance change (71.19 Ω), and a higher rate capability as compared to the batteries that use the PP and electrospun PVDF-HFP separator. The above results reveal that the PL separator is an ideal choice for high energy density lithium batteries.
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