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Guo, Feng; Chen, Xi; Hou, Yuhan; Wei, Wenshuo; Wang, Zhicheng; Yu, Hao; Xu, Jingjing
Small (Weinheim an der Bergstrasse, Germany), 04/2023, Letnik: 19, Številka: 16Journal Article
Li||NMC811 battery, with lithium‐metal (high specific capacity and low redox potential) as anode and LiNi0.8Co0.1Mn0.1O2 (NMC811) as cathode, has been widely accepted to be a good candidate as one of the high‐energy‐density batteries. However, its cyclability needs improvement to fulfill the requirement for its future commercial use, especially under practical conditions. Electrolyte plays a key role in improving the cycling performance of Li||NMC811 batteries, where a high voltage/electrochemical window and good stability with the electrodes of the electrolyte are required. Herein, a localized high‐concentration electrolyte with an additive of lithium difluoro(oxalate)borate (LiDFOB) is reported that improves the cycling performance of Li||NMC811 cells under crucial conditions with Li foil thickness of 50 µm, cathode areal loading of 4 mAh cm−2, the areal capacity ratio between the negative and positive electrodes (N/P ratio) of 2.6 and the electrolyte/cell capacity ratio (E/C ratio) of 3.0 g (Ah)−1. These cells can maintain 80% of the capacity after 195 cycles. The cyclability for Li||NMC811 battery needs improvement to fill the gap between the current battery performance and that needed for its future commercial use, especially under practical conditions. The authors propose a localized high‐concentration electrolyte with lithium difluoro(oxalate)borate additive, which improves the cycling performance of Li||NMC811 cells with a high cathode loading and minimized excess components of anode and electrolyte.
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