A Nonflammable Electrolyte for High-Voltage Lithium Metal Batteries

Zhang, Guangzhao1; Li, Jiawei2; Wang, Qingrong1; Wang, Hui3; Wang, Jun1; Yu, Kai1; Chang, Jian1; Wang, Chaoyang3; Hong, Xiang4; Ma, Qiang4; Deng, Yonghong1

2023-06-01

10.1021/acsenergylett.3c00706

ACS ENERGY LETTERS   Impact Factor & Quartile

2380-8195

The electrochemical instability of the polar solventsin electrolytesoften causes reduction/oxidation at the surface of both Li anodesand nickel-rich cathodes in high-voltage lithium metal batteries (LMBs).Here, we design a bipolar molecule-regulated electrolyte with a capsule-likesolvation structure and nonflammability to stabilize high-voltageLMBs. The key enabler is to design and synthesize a nonflammable bipolarmolecule with a ion-dissociative polar head and a perfluorinated nonpolartail. The bipolar solvent promotes the formation of capsule-like solvationsheaths via weak coordination and encapsulates the polar moleculesinside the primary solvation shell, drastically reducing the detrimentaldecomposition of solvents. Finally, the assembled high-voltage cellprovides high capacity retention (Li||LiNi0.8Co0.1Mn0.1O2: >90%) during 200 charge/dischargecycles under strict conditions. The capsule-like electrolyte alsoenables a 420 mAh pouch cell with a cell-level energy density of 440Wh kg(-1) along with long cycling stability over 150cycles (retention: 92%).

SCI

English

First ; Corresponding

Key-Area Research and Development Program of Guangdong Province[2020B090919001] ; National Natural Science Foundation of China["22109066","22078144"] ; Natural Science Foundation of Guangdong Province["2022A1515011005","2023A1515010686"] ; Guangdong Basic and Applied Basic Research Foundation[2019A1515110881] ; Shenzhen Science and Technology Program[JCYJ20220818100218040] ; Science and Technology Planning Project of Guangdong Province[2021A0505110001]

Chemistry ; Electrochemistry ; Energy & Fuels ; Science & Technology - Other Topics ; Materials Science

Chemistry, Physical ; Electrochemistry ; Energy & Fuels ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:001008138100001

AMER CHEMICAL SOC

Web of Science

1.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Environm Corros & Biofouling, Qingdao 266071, Peoples R China
3.South China Univ Technol, Res Inst Mat Sci, Guangzhou 510640, Peoples R China
4.Huawei Technol Co Ltd, Cent Res Inst, Watt Lab, Shenzhen 518129, Peoples R China

Zhang, Guangzhao,Li, Jiawei,Wang, Qingrong,et al. A Nonflammable Electrolyte for High-Voltage Lithium Metal Batteries[J]. ACS ENERGY LETTERS,2023.

Zhang, Guangzhao.,Li, Jiawei.,Wang, Qingrong.,Wang, Hui.,Wang, Jun.,...&Deng, Yonghong.(2023).A Nonflammable Electrolyte for High-Voltage Lithium Metal Batteries.ACS ENERGY LETTERS.

Zhang, Guangzhao,et al."A Nonflammable Electrolyte for High-Voltage Lithium Metal Batteries".ACS ENERGY LETTERS (2023).