期刊
SURFACE INNOVATIONS
卷 10, 期 2, 页码 119-127出版社
ICE PUBLISHING
DOI: 10.1680/jsuin.21.00010
关键词
batteries; coatings; energy storage
资金
- Australian Research Council (ARC) through the ARC Discovery project [DP180102297, FT180100705]
- Science and Technology Commission of Shanghai Municipality [19DZ2270200]
- Joint International Laboratory on Environmental and Energy Frontier Materials
- Innovation Research Team of High-Level Local Universities in Shanghai
In this work, an aluminum fluoride-coated lithium-rich cathode with a rod-shaped structure is synthesized through a hydrothermal method, showing improved structural stability and lithium ion diffusion dynamics for enhanced electrochemical performance.
Lithium (Li)-rich cathodes have attracted great attention due to their high specific capacity and energy density. However, their dramatic capacity fading limits their practical application for lithium-ion batteries. Surface coating is recognized as a universal technology for improving the capacity retention of electrodes for many energy-storage applications. In this work, an aluminum fluoride (AlF3)-coated lithium-rich cathode with a rod-shaped structure is synthesized through a hydrothermal method, followed by a chemical coprecipitation process. The aluminum fluoride protective layer provides ideal elastic buffer interspace to ameliorate the structure stability and expedite the lithiumion (Li+) diffusion dynamics, ensuring excellent electrochemical performance. Thereby the as-prepared aluminum fluoride-coated electrode has a high reversible discharge capacity of 195.6 mAh/g after 130 cycles at 0.1 C, corresponding to 89.9% of its initial specific capacity. A discharge capacity of 133.4 mAh/g can be achieved even at 2 C, much higher than that of the bare lithium-rich electrode (101.5 mAh/g). These results indicate that aluminum fluoride coating is an effective strategy to improve the electrochemical performance of lithium-rich cathodes.
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