Fluorinated co-solvent promises Li-S batteries under lean-electrolyte conditions

被引:73
作者
Shin, Woochul [1 ]
Zhu, Liangdong [1 ]
Jiang, Heng [1 ]
Stickle, William F. [2 ]
Fang, Chong [1 ]
Liu, Cong [2 ]
Lu, Jun [3 ]
Ji, Xiulei [1 ]
机构
[1] Oregon State Univ, Dept Chem, Gilbert Hall 153, Corvallis, OR 97331 USA
[2] Hewlett Packard Corp, 1000 NE Circle Blvd, Corvallis, OR USA
[3] Argonne Natl Lab, Chem Sci & Engn Div, Lemont, IL 60439 USA
关键词
LITHIUM-SULFUR BATTERIES; INITIO MOLECULAR-DYNAMICS; IONIC ASSOCIATION; ANODE MATERIAL; METAL ANODE; PERFORMANCE; CATHODE; SAFE; POLYSULFIDE; COMPOSITES;
D O I
10.1016/j.mattod.2020.06.007
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Practical lithium-sulfur batteries stipulate the use of a lean-electrolyte and a high Coulombic efficiency of the lithium metal anode. Herein, we employ 1,1,2,2-tetrafluoroethyl 2,2,2-trifluoroethyl ether as a co-solvent in the electrolyte of Li-S batteries to meet the demands. The co-solvent fosters the formation of a LiF-rich solid electrolyte interphase on lithium metal anode, as revealed by Ab initio molecular dynamics and Femtosecond Stimulated Raman spectroscopy. The co-solvent results in an average Coulombic efficiency of 99.4% for lithium plating/stripping cycles. Full cells with a capacity ratio of 2 between lithium anode and the S@PAN cathode (3 mg(s) cm(-2)) exhibited a stable cycle life over 100 cycles at an electrolyte/sulfur ratio of 2 mu L mg(-1), validating the high Coulombic efficiency of the lithium anode and demonstrating the compatibility of the electrolyte with both electrodes. To enhance the energy density, we prepared a hybrid cathode composed of 45 wt.% VS2 mixed with ZnS-coated Li2S@graphene as the cathode. Based on the mass of both electrodes and the electrolyte, the full cell delivers an energy density of 483 Wh kg(-1), which demonstrates viable Li-S batteries with the lean electrolyte.
引用
收藏
页码:63 / 71
页数:9
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