Coordination structure regulation in non-flammable electrolyte enabling high voltage lithium electrochemistry

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外文摘要：High-voltage battery systems bring significant increases in energy density but are also accompanied by fast degradation of electrochemical performance and serious safety issues.Herein,Li+coordination struc-ture regulation was conducted to formulate a non-flammable electrolyte,which consists of 1.5 M lithium bis(fluor sulfonyl)imide(LiFSI)in triethyl phosphate and methyl 2,2,2-trifluoromethyl carbonate(FEMC).The renamed TEP-FEMC-FEC(TFF)electrolyte exhibits an FSI--dominated solvation structure contributed by the weakly-solvating ability of FEMC.The generated inorganic-rich interfacial layers are conducive to stabilizing the phase transition of high-voltage cathodes while suppressing the dendritic growth on lithium metal or co-intercalation behavior in graphite anode.This TFF electrolyte enables LiCoO2||Li batteries to achieve capacity maintenance over 79％after 400 cycles with high-rate of 5 C at an ultra-high voltage of 4.6 V,and an outstanding capacity exceeding 100 mA h g-1 even at a super-high current density of 20 C.Additionally,the Ah-level LiCoO2||graphite pouch cells also exhibit high capacity retention and satisfactory safety performance even under fast charging.This work provides a novel research direction for the pursuit of high energy density non-flammable electrolytes.

外文关键词：

Non-flammableSolvation structureHigh-voltageLithium batteries

作者：

Zhiwen Deng、Ye Jia、Yan Deng、Changhaoyue Xu、Xuemei Zhang、Qiujie He、Jianan Peng、Hao Wu、Wenlong Cai

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作者单位：

College of Materials Science and Engineering,Sichuan University,Chengdu 610064,Sichuan,China

Engineering Research Center of Alternative Energy Materials and Devices,Sichuan University,Chengdu 610064,Sichuan,China

基金：

National Science Foundation of Sichuan ProvinceFundamental Research Funds for the Central UniversitiesScience and Technology Cooperation Special Fund of Sichuan University and Zigong City

项目编号：

2023NSFSC1124YJ20211412022CDZG-9

出版年：

2024

DOI：

10.1016/j.jechem.2024.04.041

能源化学

中国科学院大连化学物理研究所中国科学院成都有机化学研究所

能源化学

CSTPCDEI

影响因子：0.654

ISSN：2095-4956

年,卷(期)：2024.96(9)