FSI-inspired solvent and "full fluorosulfonyl" electrolyte for 4 V class lithium-metal batteries

被引：237

作者：

Xue, Weijiang ^{[1
]}

Shi, Zhe ^{[2
]}

Huang, Mingjun ^{[3
]}

Feng, Shuting ^{[4
]}

Wang, Chao ^{[1
]}

Wang, Fei ^{[2
]}

Lopez, Jeffrey ^{[5
]}

Qiao, Bo ^{[3
,5
]}

Xu, Guiyin ^{[1
]}

Zhang, Wenxu ^{[3
]}

Dong, Yanhao ^{[1
]}

Gao, Rui ^{[1
]}

Shao-Horn, Yang ^{[5
,6
]}

Johnson, Jeremiah A. ^{[3
]}

Li, Ju ^{[1
,2
]}

机构：

[1] MIT, Dept Nucl Sci & Engn, Cambridge, MA 02139 USA

[2] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

[3] MIT, Dept Chem, Cambridge, MA 02139 USA

[4] MIT, Dept Chem Engn, Cambridge, MA 02139 USA

[5] MIT, Res Lab Elect, Cambridge, MA 02139 USA

[6] MIT, Dept Mech Engn, Cambridge, MA 02139 USA

来源：

ENERGY & ENVIRONMENTAL SCIENCE | 2020年 / 13卷 / 01期

基金：

美国国家科学基金会;

关键词：

HIGH-ENERGY; ETHER ELECTROLYTES; ANODE; INTERPHASE; SOLVATION; SUFEX; IONS;

D O I：

10.1039/c9ee02538c

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

High-voltage rechargeable lithium-metal batteries (LMBs) require electrolytes that are compatible with both the Li metal anode (LMA) and the metal-oxide cathode. Herein, by imitating the fluorosulfonyl imide group from a well-known LMA-compatible salt, lithium bis(fluorosulfonyl) imide (LiFSI), we come up with an organic solvent dimethylsulfamoyl fluoride (FSO2NC2H6), a fluorosulfonamide (FSA) with two methyl substituents, to develop a new "full fluorosulfonyl" (FFS) electrolyte. Remarkably, it enables a highly reversible LMA with an excellent initial coulombic efficiency (CE) similar to 91%, and rapidly approaching 99% within only 10 cycles, with average CE outperforming the well-known LMA-compatible fluoroethylene carbonate (FEC)-based electrolyte. Furthermore, benefitting from its high anodic stability against the oxidative LiNi0.6Mn0.2Co0.2O2 (NMC622) and LiMn2O4 (LMO) surfaces, the Li||NMC622 cell retains 89% of its original capacity after 200 cycles using a limited Li excess anode. This electrolyte design strategy opens a new avenue for exploring new medium-concentration organic electrolytes for 4 V class lithium-metal batteries (LMBs).

引用

页码：212 / 220

页数：9

共 60 条

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