Статья

50C Fast‐Charge Li‐Ion Batteries using a Graphite Anode

Chuangchao SunState Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. ChinaXiao JiDepartment of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USASuting WengBeijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. ChinaRuhong LiState Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. ChinaXiaoteng HuangState Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. ChinaChunnan ZhuState Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. ChinaXuezhang XiaoState Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. ChinaTao DengDepartment of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USALi‐Wu FanInstitute of Thermal Science and Power Systems School of Energy Engineering Zhejiang University Hangzhou 310027 P. R. ChinaLixin ChenKey Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province Hangzhou 310013 P. R. ChinaXuefeng WangBeijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. ChinaChunsheng WangDepartment of Chemical and Biomolecular Engineering University of Maryland College Park MD 20742 USAXiulin FanState Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 P. R. China

2022en

ABI

Аннотация

Abstract Li‐ion batteries have made inroads into the electric vehicle market with high energy densities, yet they still suffer from slow kinetics limited by the graphite anode. Here, electrolytes enabling extreme fast charging (XFC) of a microsized graphite anode without Li plating are designed. Comprehensive characterization and simulations on the diffusion of Li + in the bulk electrolyte, charge‐transfer process, and the solid electrolyte interphase (SEI) demonstrate that high ionic conductivity, low desolvation energy of Li + , and protective SEI are essential for XFC. Based on the criterion, two fast‐charging electrolytes are designed: low‐voltage 1.8 m LiFSI in 1,3‐dioxolane (for LiFePO 4 ||graphite cells) and high‐voltage 1.0 m LiPF 6 in a mixture of 4‐fluoroethylene carbonate and acetonitrile (7:3 by vol) (for LiNi 0.8 Co 0.1 Mn 0.1 O 2 ||graphite cells). The former electrolyte enables the graphite electrode to achieve 180 mAh g −1 at 50C (1C = 370 mAh g −1 ), which is 10 times higher than that of a conventional electrolyte. The latter electrolyte enables LiNi 0.8 Co 0.1 Mn 0.1 O 2 ||graphite cells (2 mAh cm −2 , N/P ratio = 1) to provide a record‐breaking reversible capacity of 170 mAh g −1 at 4C charge and 0.3C discharge. This work unveils the key mechanisms for XFC and provides instructive electrolyte design principles for practical fast‐charging LIBs with graphite anodes.

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Идентификаторы

DOI: 10.1002/adma.202206020

Цитирования и источники

Цитирований: 3Использованных источников: 0

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