Lithium (fluorosulfonyl)(n-nonafluorobutanesulfonyl)imide for stabilizing cathode-electrolyte interface in sulfonamide electrolytes

被引:5
作者
Wu, Hao [1 ]
Song, Ziyu [1 ]
Feng, Wenfang [1 ]
Zhou, Zhibin [1 ]
Zhang, Heng [1 ]
机构
[1] Huazhong Univ Sci & Technol, Sch Chem & Chem Engn, Key Lab Mat Chem Energy Convers & Storage, Minist Educ, Wuhan 430074, Peoples R China
基金
中国国家自然科学基金;
关键词
lithium metal batteries; lithium (fluorosulfonyl)(n-nonafluorobutanesulfonyl)imide; sulfonamide; non-flammable electrolyte; cathode stabilization; ELECTROCHEMICAL PERFORMANCE; LIQUID ELECTROLYTE; THERMAL RUNAWAY; IONIC LIQUIDS; BATTERIES; CARBONATE; VISCOSITY; GRAPHITE; DESIGN; ANIONS;
D O I
10.1007/s12274-023-5726-7
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
Rechargeable lithium metal batteries (RLMBs) have been regarded as promising successors for contemporary lithium-ion batteries, in view of their high gravimetric and volumetric energy densities. Conventional non-aqueous liquid electrolytes containing organic carbonate solvents possess high chemical reactivities with metallic lithium anode and high flammability, which induces considerable safety threats under extreme conditions (e.g., overcharging and thermal runaway). Herein, we propose the utilization of fluorinated sulfonamide (i.e., N,N-dimethyl fluorosulfonamide (DMFSA)) as solvent, together with lithium (fluorosulfonyl)(n-nonafluorobutanesulfonyl)imide (LiFNFSI) as co-salt and/or electrolyte additive for accessing safer and highperforming RLMBs. Comprehensive physical (e.g., thermal transition, viscosity, and ionic conductivity) and electrochemical (e.g., anodic stability on different electrodes) characterizations have been performed, aiming to reveal the inherent characteristics of the sulfonamide-based electrolytes and the particular role of LiFNFSI on the stabilization of LiCoO2 cathode. It has been demonstrated that the sulfonamide-based electrolytes exhibit superior flame-retardant abilities and decent ionic conductivities (> 1 mS center dot cm- 1 at room temperature). The incorporation of LiFNFSI as co-salt and/or electrolyte additive could significantly suppress the side reactions occurring at the cathode compartment, through the preferential decompositions of the FNFSI- anion. This work is anticipated to give an in-depth understanding on the working mechanism of LiFNFSI in the sulfonamide-based electrolytes, and also spurs the development of high-energy and safer RLMBs.
引用
收藏
页码:9507 / 9518
页数:12
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