Li2S-based anode-free full batteries with modified Cu current collector

被引:96
作者
Chen, Jie [1 ]
Xiang, Jingwei [1 ]
Chen, Xin [1 ]
Yuan, Lixia [1 ]
Li, Zhen [1 ]
Huang, Yunhui [1 ]
机构
[1] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & & Mold Technol, Wuhan 430074, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
Li-S batteries; Anode free; High energy density; Dendrite free; Li2S cathodes; LITHIUM METAL; LI2S CATHODES; PERFORMANCE; CELLS;
D O I
10.1016/j.ensm.2020.05.009
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
It is considered that anode-free Li-metal batteries are one of the promising constructions for achieving extremely high energy density, but they still suffer from low Coulombic efficiency, rapid capacity fading and dendrite growth issues. Here, we demonstrate an anode-free full cell with Li2S as cathode and Au-modified Cu foil as the vacant anodic current collector for achieving a very high energy density up to 626 Wh kg(-1). The Au-modification (0.168 mg cm(-2), $ similar to 0.008 cm(-2)) will transform to Li x Au alloy and solid solution, which can successfully lower the nucleation barrier of Li deposition and induce the dendrite-free Li morphology. As a result, the anode-free Li2S parallel to Au/Cu full cell exhibits a greatly improved initial Coulombic efficiency of 69% and a stable cyclability over 150 cycles. Our work provides a new route to realize the truly Li-limited Li-S full batteries with much higher overall energy density and greatly stabilized interfacial chemistry.
引用
收藏
页码:179 / 186
页数:8
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