AI Article Synopsis
- High-entropy materials enhance the performance and stability of lithium-ion battery cathodes, but their surface stability and electrochemical performance still need improvement.
- This study introduces a new material, LiNiCoAlFeMnOF, which substitutes oxygen with fluorine to enhance these properties.
- The results show this new compound significantly outperforms a previous version, achieving 85.4 mAh/g capacity and 71.5% retention after 100 cycles, indicating potential for better battery technology.
Article Abstract
High-entropy materials have been demonstrated to improve the structural stability and electrochemical performance of layered cathode materials for lithium-ion batteries (LIBs). However, structural stability at the surface and electrochemical performance of these materials are less than ideal. In this study, we show that fluorine substitution can improve both issues. Here, we report a new high-entropy layered cathode material LiNiCoAlFeMnOF (HEOF1) based on the partial substitution of oxygen with fluorine in previously reported high-entropy layered oxide LiNiCoAlFeMnO. This new compound delivers a discharge capacity of 85.4 mAh g and a capacity retention of 71.5% after 100 cycles, showing significant improvement from LiNiCoAlFeMnO (first 57 mAh g and 9.8% after 50 cycles). This improved electrochemical performance is due to suppression of the surface MO phase formation. Although still an early stage study, our results show an approach to stabilize the surface structure and improve the electrochemical performance of high-entropy layered cathode materials.
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| http://dx.doi.org/10.1021/acs.jpclett.3c00891 | DOI Listing |
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