Balanced solvation/de-solvation of electrolyte facilitates Li-ion intercalation for fast charging and low-temperature Li-ion batteries

被引:118
作者
Lei, Sheng [1 ,2 ]
Zeng, Ziqi [1 ]
Liu, Mengchuang [1 ,3 ]
Zhang, Han [1 ,2 ]
Cheng, Shijie [1 ]
Xie, Jia [1 ]
机构
[1] Huazhong Univ Sci & Technol, Sch Elect & Elect Engn, State Key Lab Adv Electromagnet Engn & Technol, Wuhan 430074, Peoples R China
[2] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China
[3] Huazhong Univ Sci & Technol, Sch Chem & Chem Engn, Wuhan 430074, Peoples R China
基金
中国国家自然科学基金;
关键词
Electrolytes; Fast charging; Low-temperature; Lithium-ion batteries; CHEMISTRY; DESIGN; ANODE;
D O I
10.1016/j.nanoen.2022.107265
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Long charging times and poor low-temperature performance are two major challenges that hamper the widespread use of lithium-ion batteries in electrical devices. The electrolyte plays an important role in determining the charging time and operating temperature of batteries. Herein we demonstrate a weakly-solvating electrolyte consisting of 2.0 M lithium bis(fluorosulfonyl)imide in acetonitrile with fluorobenzene as the cosolvent. This combination is superior in terms of balancing the solvation/de-solvation of an electrolyte which simultaneously yields enhanced diffusion of Li+ in the bulk electrolyte and improved kinetics of Li+ de-solvation. In addition, we achieve a rapid interfacial diffusion of Li+ at the inorganic-polymeric solid electrolyte interphase, derived from fluorobenzene. Graphite half cells show a high specific capacity of 302.7 mA h g-1 at 8 C, long-term cycle life (91% retention after 1000 cycles at 5 C), and remarkable low temperature performance. Moreover, the NCM811 | graphite pouch cells also exhibit outstanding performance for fast-charging (201 mA h g-1 at 0.5 C and 167 mA h g-1 at 5 C) as well as outstanding cycling stability (80% retention after 500 cycles at 5 C). In summary, we provide design principles and experimental demonstration of next-generation electrolytes capable of fast charging and low-temperature operation.
引用
收藏
页数:9
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