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A nonflammable electrolyte for ultrahigh-voltage (4.8 V-class) Li||NCM811 cells with a wide temperature range of 100 degrees C

文献类型：期刊论文

作者Xiao, Peitao2,3; Zhao, Yun1,6; Piao, Zhihong2; Li, Baohua1,6; Zhou, Guangmin2; Cheng, Hui-Ming2,4,5
刊名ENERGY & ENVIRONMENTAL SCIENCE
出版日期2022-04-21
页码10
ISSN号1754-5692
DOI10.1039/d1ee02959b
通讯作者Zhou, Guangmin(guangminzhou@sz.tsinghua.edu.cn) ; Cheng, Hui-Ming(hmcheng@sz.tsinghua.edu.cn)
英文摘要The development of ultrahigh-voltage lithium metal batteries is one of the most promising ways to increase the energy density. However, commercial ethylene carbonate (EC)-based electrolytes have poor compatibility with both lithium metal anodes and cathodes at ultrahigh voltages. We report a high-voltage resistant electrolyte (HV electrolyte) produced by the fluorination of commercial solvents with the guidance of theoretical calculations. These designed solvents, with low energy levels of the lowest unoccupied molecular orbital (LUMO), can be preferably reduced at the lithium metal anode, suppressing lithium dendrite growth because of the formation of a LiF-rich solid-electrolyte interphase (SEI). Fluorination also decreases the energy levels of the highest occupied molecular orbital (HOMO), resulting in improved anodic stability at ultrahigh voltages. The low binding energies between fluorinated solvents in the HV electrolyte and Li+ accelerate the desolvation of Li+, leading to excellent electrochemical kinetics. As a result, Li||LiNi0.8Co0.1Mn0.1O2 (NCM811) cells, which can work in a wide operating temperature range from -30 to 70 degrees C, have capacity retentions of 95.1% after 160 cycles and 85.7% after 100 cycles at ultrahigh cut-off voltages of 4.7 and 4.8 V, respectively. Li||NCM811 cells with a thin (50 mu m) lithium metal anode and a lean electrolyte were constructed, and had a capacity retention of 89.2% after 150 cycles, demonstrating high potential in practical use as high energy density batteries.
资助项目National Key Research and Development Program of China[2019YFA0705700] ; National Key Research and Development Program of China[2021YFB2500200] ; National Natural Science Foundation of China[52072205] ; National Natural Science Foundation of China[U21A20174] ; Tsinghua Shenzhen International Graduate School
WOS研究方向Chemistry ; Energy & Fuels ; Engineering ; Environmental Sciences & Ecology
语种英语
出版者ROYAL SOC CHEMISTRY
WOS记录号WOS:000788168600001
资助机构National Key Research and Development Program of China ; National Natural Science Foundation of China ; Tsinghua Shenzhen International Graduate School
源URL[http://ir.imr.ac.cn/handle/321006/172632]  
专题金属研究所_中国科学院金属研究所
通讯作者Zhou, Guangmin; Cheng, Hui-Ming
作者单位1.Tsinghua Shenzhen Int Grad Sch SIGS, Shenzhen Key Lab Power Battery Safety, Shenzhen 518055, Peoples R China
2.Tsinghua Univ, Shenzhen Geim Graphene Ctr, Shenzhen Int Grad Sch, Tsinghua Berkeley Shenzhen Inst & Tsinghua, Shenzhen 518055, Peoples R China
3.Natl Univ Def Technol, Coll Aerosp Sci & Engn, Changsha 410073, Peoples R China
4.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
5.Chinese Acad Sci, Inst Technol Carbon Neutral, Shenzhen Inst Adv Technol, Shenzhen 518055, Peoples R China
6.Tsinghua Shenzhen Int Grad Sch SIGS, Shenzhen Geim Graphene Ctr, Shenzhen 518055, Peoples R China
推荐引用方式
GB/T 7714		 Xiao, Peitao,Zhao, Yun,Piao, Zhihong,et al. A nonflammable electrolyte for ultrahigh-voltage (4.8 V-class) Li||NCM811 cells with a wide temperature range of 100 degrees C[J]. ENERGY & ENVIRONMENTAL SCIENCE,2022:10.
APA Xiao, Peitao,Zhao, Yun,Piao, Zhihong,Li, Baohua,Zhou, Guangmin,&Cheng, Hui-Ming.(2022).A nonflammable electrolyte for ultrahigh-voltage (4.8 V-class) Li||NCM811 cells with a wide temperature range of 100 degrees C.ENERGY & ENVIRONMENTAL SCIENCE,10.
MLA Xiao, Peitao,et al."A nonflammable electrolyte for ultrahigh-voltage (4.8 V-class) Li||NCM811 cells with a wide temperature range of 100 degrees C".ENERGY & ENVIRONMENTAL SCIENCE (2022):10.

入库方式： OAI收割

来源：金属研究所

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