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Achieving Practical High‐Energy‐Density Lithium‐Metal Batteries by a Dual‐Anion Regulated Electrolyte by Hai Su; Zifeng Chen; Mengjie Li; Panxing Bai; Yong Li; Xiao Ji; Ziqiang Liu; Jie Sun; Jia Ding; Ming Yang; Xiayin Yao; Chong Mao; Yunhua Xu is a Engineering article available to read on EtoBox.

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Lithium metal batteries (LMBs) using lithium metal anodes and high-voltage cathodes have been deemed as one of the most promising high-energy-density battery technology. However, its practical application is largely hindered by the notorious dendrite growth of lithium metal anode, fast structure degradation of cathode and insufficient electrode-electrolyte interphase kinetics. Here, a solvation structure regulation strategy is developed for LMBs using lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) and lithium difluoro(bisoxalato)phosphate (LiDFBOP) as anion regulators. The incorporation of TFSI -in the solvation sheath reduces the desolvation energy of Li + , and DFBOP -promotes the formation of high ion-conductive and sustainable inorganic-rich interphases on electrodes. Significantly enhanced performance is demonstrated on Li||LiNi0.83Co0.11Mn0.06O2 pouch cells, with 84.6% capacity retention after 150 cycles in 6.0 Ah pouch cells and an ultra-high rate capability up to 5 C in 2.0 Ah pouch cells. Furthermore, a pouch cell with an ultra-large capacity of 39.0 Ah is fabricated and achieves an ultra-high energy density of 521.3 Wh kg -1 . Our findings provide a facile electrolyte

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Author

Hai Su; Zifeng Chen; Mengjie Li; Panxing Bai; Yong Li; Xiao Ji; Ziqiang Liu; Jie Sun; Jia Ding; Ming Yang; Xiayin Yao; Chong Mao; Yunhua Xu

Publisher

Wiley

Published

2023

Language

EN

Field

Engineering (Physical Sciences)