首页|Anion-Regulated Weakly Solvating Electrolytes for High-Voltage Lithium Metal Batteries

Anion-Regulated Weakly Solvating Electrolytes for High-Voltage Lithium Metal Batteries

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Development of advanced high-voltage electrolytes is key to achieving high-energy-density lithium metal batteries(LMBs).Weakly solvating electrolytes(WSE)can produce unique anion-driven interphasial chemistry via altering the solvating power of the solvent,but it is difficult to dissolve the majority of Li salts and fail to cycle at a cut-off voltage above 4.5 V.Herein,we present a new-type WSE that is regulated by the anion rather than the solvent,and the first realize stable cycling of dimethoxyethane(DME)at 4.6 V without the use of the"solvent-in-salt"strategy.The relationships between the degree of dissociation of salts,the solvation structure of electrolytes,and the electrochemical performance of LMBs were systematically investigated.We found that LiBF4,which has the lowest degree of dissociation,can construct an anion-rich inner solvation shell,resulting in anion-derived anode/cathode interphases.Thanks to such unusual solvation structure and interphasial chemistry,the Li-LiCoO2 full cell with LiBF4-based WSE could deliver excellent rate performance(115 mAh g-1 at 10 C)and outstanding cycling stability even under practical conditions,including high loading(10.7 mg cm-2),thin Li(50 pm),and limited electrolyte(1.2 μL mg1).

high-voltage LiCoO2lithium metal batteriessolvation structureweakly solvating electrolyte

Zhipeng Jiang、Jisheng Mo、Chen Li、Haiwen Li、Qingan Zhang、Ziqi Zeng、Jia Xie、Yongtao Li

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School of Materials Science and Engineering & Low-Carbon New Materials Research Center,Anhui University of Technology,Maanshan 243002,China

Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials of Ministry of Education,Anhui University of Technology,Maanshan 243002,China

Hefei General Machinery Research Institute,Hefei 230031,China

State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

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Key Program for International S&T Cooperation Projects of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Anhui Provincial Education DepartmentAnhui Provincial Natural Science Foundation for Excellent Youth ScholarsExcellent Science and Technology Innovation Group of Jiangsu Province

2017YFE0124300519710025217120552171197KJ2021A03932108085Y16

2023

10.1002/eem2.12440

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(6)
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