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Multiple Surface Optimizations for a Highly Durable LiCoO2 beyond 4.6 V
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DOI：10.1002/adfm.202307913.png)
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摘要
En 中文
Recently, lots of researches have focused on enhancing the structure stability of LiCoO2 (LCO) at a cutoff voltage of 4.6 V (vs Li/Li+) at roomtemperature. However, the high temperature (>= 45 degrees C) performances are more significant for practical applications. Herein, the mechanism of unsatisfactory structure stability of LCO at 45 degrees C via comparing a commercial LCO (C-LCO) and a surface optimized LCO (O-LCO) is revealed first. The deteriorated structure stability of LCO at 45 degrees C is mainly due to two aspects: i) the promoted bulk Li+ ion diffusion kinetics at 45 degrees C leads to a higher state of charge for the charged LCO, which triggers more side reactions; ii) the more prominent surface structure collapse at 45 degrees C blocks the Li+ ion transport channels. Surface optimizations, including the anions (F- and PO43-) and cations (Al3+) surface modulation and a subsurface spinel reinforcement, are comprehensively applied to alleviate the side reaction and structure collapse issues of O-LCO, leading to a high reversible discharge capacity of 238 mAh g(-1), as well as an obviously enhanced cycle and floating stability at 45 degrees C and beyond 4.6 V. A new insight is provided here for developing more advanced and practical high-voltage LCO.
Keyword:
high-temperature performances
LiCoO2
Li-ion batteries
surface modulation
期刊
IF:
19
论文数:
3.5W
被引数:
32.1W
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