PVDF-HFP-Based Composite Electrolyte Membranes having High Conductivity and Lithium-Ion Transference Number for Lithium Metal Batteries

被引:28
作者
Liu, Xuhua [1 ]
Liu, Jie [1 ]
Lin, Bencai [1 ]
Chu, Fuqiang [1 ]
Ren, Yurong [1 ]
机构
[1] Changzhou Univ, Jiangsu Collaborat Innovat Ctr Photovolta Sci & E, Sch Mat Sci & Engn, Changzhou 213164, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
lithium metal batteries; solid polymer electrolytes; composite electrolyte membranes; conductivity; lithium-ion transference number; BAB TRIBLOCK COPOLYMERS; POLYMER ELECTROLYTES; DENDRITE-FREE; HIGH-PERFORMANCE; RECENT PROGRESS; TEMPERATURE; SULFONATE; NETWORK; ANODE; GLASS;
D O I
10.1021/acsaem.1c03417
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Lithium metal batteries (LMBs) with liquid-based electrolytes usually suffer from safety problems such as the growth of Li dendrites and the leakage and volatilization of organic solvents. Replacing liquid-based electrolytes using solid polymer electrolytes may resolve these problems. In this study, sulfonated polyvinylidene fluoride lithium-hexafluoropropylene (SPVDFLiHFP), a single-ion conductive polymer, is synthesized from polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) and chlorosulfonic acid, and a series of LMBs are fabricated using SPVDFLi-HFPx/PVDF-HFP composite electrolyte membranes and characterized. The as-prepared SPVDFLi-HFPx/PVDF-HFP composite electrolyte membranes possess high conductivity (2.84 x 10(-4) S cm(-1)), a wide electrochemical window (5.4 V, vs Li/Li+), and high interface compatibility with lithium metal anodes. Benefiting from the single-ion conductive nature of SPVDFLi-HFP, SPVDFLi-HFP50/PVDF-HFP exhibits a high lithium-ion transference number of 0.81. A solid-state LiFePO4 vertical bar SPVDFLi-HFP50/PVDF-HFP|Li battery exhibits an initial capacity of 147.9 mA h g(-1), a capacity retention of 89.1% at the end of 200 cycles, and an average Coulombic efficiency exceeding 99% at 0.2 C, demonstrating strong application potential in LMBs.
引用
收藏
页码:1031 / 1040
页数:10
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