A Compact Gel Membrane Based on a Blend of PEO and PVDF for Dendrite-Free Lithium Metal Anodes

被引:30
作者
Liang, Shishuo [1 ]
Shi, Yi [1 ]
Ma, Tianyi [1 ]
Yan, Wenqi [1 ]
Qin, Sainan [1 ]
Wang, Yuqi [1 ]
Zhu, Yusong [1 ]
Wang, Hongwei [2 ]
Wu, Yuping [1 ]
机构
[1] Nanjing Tech Univ, Sch Energy Sci & Engn, Nanjing 211816, Jiangsu, Peoples R China
[2] Chinese Acad Inspect & Quarantine, Inst Ind & Consumer Prod Safety, Beijing 100176, Peoples R China
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
dendrite-free; gel membrane; batteries; lithium metal anode; polymer electrolyte; MICROPOROUS POLYMER ELECTROLYTE; HIGH-PERFORMANCE; COMPOSITE ELECTROLYTE; SAFE;
D O I
10.1002/celc.201901351
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
A compact gel membrane (GM) with certain flexibility is facilely fabricated after a casted PEO/PVDF blend film is swelled by a LiPF6-based liquid electrolyte. The GM exhibits a suitable lithium ionic conductivity (0.28 mS cm(-1) at r.t., room temperature), a remarkable lithium-ion transference number (0.52 at r.t.), and high mechanical strength (19.0 MPa) in dry or wet state. Owing to the special comprehensive performance of the GM, dendrite-free reversible lithium plating/stripping (up to 500 h) at a current density of 0.5 mA cm(-2) and a capacity of 0.25 mAh cm(-2) is achieved for Li metal anodes at r.t.. The suppression of lithium dendrite of the obtained GM is further demonstrated in Li/GM/LiFePO4 cells with a high discharge capacity (142 mAh g(-1) at r.t. and 160 mAh g(-1)at 50 degrees C) and a superior cycling stability. This research provides a new strategy for developing lithium metal batteries with high stability and long cycle life.
引用
收藏
页码:5413 / 5419
页数:7
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