Low-solvation electrolytes for high-voltage sodium-ion batteries

Yan Jin, Phung M. L. Le, Peiyuan Gao, Yaobin Xu, Biwei Xiao, Mark H. Engelhard, Xia Cao, Thanh D. Vo, Jiangtao Hu, Lirong Zhong, Bethany E. Matthews, Ran Yi, Chongmin Wang, Xiaolin Li, Jun Liu and Ji-Guang Zhang ()
Additional contact information
Yan Jin: Pacific Northwest National Laboratory
Phung M. L. Le: Pacific Northwest National Laboratory
Peiyuan Gao: Pacific Northwest National Laboratory
Yaobin Xu: Pacific Northwest National Laboratory
Biwei Xiao: Pacific Northwest National Laboratory
Mark H. Engelhard: Pacific Northwest National Laboratory
Xia Cao: Pacific Northwest National Laboratory
Thanh D. Vo: Pacific Northwest National Laboratory
Jiangtao Hu: Pacific Northwest National Laboratory
Lirong Zhong: Pacific Northwest National Laboratory
Bethany E. Matthews: Pacific Northwest National Laboratory
Ran Yi: Pacific Northwest National Laboratory
Chongmin Wang: Pacific Northwest National Laboratory
Xiaolin Li: Pacific Northwest National Laboratory
Jun Liu: Pacific Northwest National Laboratory
Ji-Guang Zhang: Pacific Northwest National Laboratory

Nature Energy, 2022, vol. 7, issue 8, 718-725

Abstract: Abstract Sodium-ion batteries (NIBs) have attracted worldwide attention for next-generation energy storage systems. However, the severe instability of the solid–electrolyte interphase (SEI) formed during repeated cycling hinders the development of NIBs. In particular, the SEI dissolution in NIBs with a high-voltage cathode is more severe than in the case of Li-ion batteries (LIBs) and leads to continuous side reactions, electrolyte depletion and irreversible capacity loss, making NIBs less stable than LIBs. Here we report a rational electrolyte design to suppress the SEI dissolution and enhance NIB performance. Our electrolyte lowers the solvation ability for SEI components and facilitates the formation of insoluble SEI components, which minimizes the SEI dissolution. In addition to the stable SEI on a hard carbon (HC) anode, we also show a stable interphase formation on a NaNi0.68Mn0.22Co0.1O2 (NaNMC) cathode. Our HC||NaNMC full cell with this electrolyte demonstrates >90% capacity retention after 300 cycles when charged to 4.2 V. This study enables high-voltage NIBs with long cycling performance and provides a guiding principle in electrolyte design for sodium-ion batteries.

Date: 2022
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DOI: 10.1038/s41560-022-01055-0

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