首页|Nitrile Electrolyte Strategy for 4.9 V-Class Lithium-Metal Batteries Operating in Flame

Nitrile Electrolyte Strategy for 4.9 V-Class Lithium-Metal Batteries Operating in Flame

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Challenges facing high-voltage/high-capacity cathodes,in addition to the longstanding problems pertinent to lithium(Li)-metal anodes,should be addressed to develop high-energy-density Li-metal batteries.This issue mostly stems from interfacial instability between electrodes and electrolytes.Conventional carbonate-or ether-based liquid electrolytes suffer from not only volatility and flammability but also limited electrochemical stability window.Here,we report a nitrile electrolyte strategy based on concentrated nitrile electrolytes(CNEs)with co-additives.The CNE consists of high-concentration lithium bis(fluorosulfonyl)imide(LiFSI)in a solvent mixture of succinonitrile(SN)/acetonitrile(AN).The SN/AN solvent mixture is designed to ensure high oxidation stability along with thermal stability,which are prerequisites for high-voltage Li-metal cells.The CNE exhibits interfacial stability with Li metals due to the coordinated solvation structure.Lithium nitrate(LiNO3)and indium fluoride(lnF3)are incorporated in the CNE as synergistic co-additives to further stabilize solid-electrolyte interphase(SEI)on Li metals.The resulting electrolyte(CNE+LiNO3/lnF3)enables stable cycling performance in LillLiNi0.8Co0.1Mn0.1 and 4.9 V-class LillLiNi0.5Mn1.5O4 cells.Notably,the LillLiNi0.5Mn1.5O4 cell maintains its electrochemical activity at high temperature(100 ℃)and even in flame without fire or explosion.

4.9 V-class cathodeselectrolyte-electrode interfaceslithium-metal batteriesnitrile electrolytessafety

Hyunseok Moon、Sung-Ju Cho、Dae-Eun Yu、Sang-Young Lee

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Department of Chemical and Biomolecular Engineering,Yonsei University,Seoul 03722,Korea

Molecular Foundry,Lawrence Berkeley National Laboratory,Berkeley CA USA

Batteries R&D Center,LG Energy Solution,Daejeon 34122,Korea

U.S.Army Research Office(ARO)Basic Science Research ProgramBasic Science Research Program韩国国家研究基金会项目Ministry of Science,ICT and Future Planning,the Technol-ogy Innovation ProgramMinistry of Science,ICT and Future Planning,the Technol-ogy Innovation ProgramMinistry of Trade,Industry & Energy(MOTIE)Research and Development program for Forest Science TechnologyKorea Forest Service(Korea Forestry Promotion Institute)

W911NF-18-1-00162021R1A2B5B030016152021M3H4A1A020993552001096020012216FTIS 2021354D10-2123-AC03

2023

10.1002/eem2.12383

能源与环境材料(英文)

能源与环境材料(英文)

CSCD
ISSN：
年,卷(期)：2023.6(3)
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