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| PO43- doping and AlF3 coating synergistically enhancing electrochemical properties of Li1.2Ni0.13Co0.13Mn0.54O2 cathode material |
| Author Name | Affiliation | E-mail | | LUO Bi-Cheng | State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China | | | WU Liang | State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China | | | PENG Yan | State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China | | | FENG Xiang-Yu | State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China | | | ZHOU Ming-Ran | State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China | | | WANG Chen-Yu | State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China | | | LIU Jing | State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China | liu_jing@whut.edu.cn | | LI Yu | State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China | yu.li@whut.edu.cn |
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| Abstract: The lithium-rich manganese-based material (Li1.2Ni0.13Co0.13Mn0.54O2, LNCM) is susceptible to structural transformations and interfacial side reactions during charge and discharge, leading to rapid capacity decay and posing significant challenges for its commercial application. In this study, a synergistic modification strategy involving PO43- (P) doping and AlF3 coating was employed to prepare the P-LNCM@AlF3 cathode material, which enhances the structural stability of LNCM and suppresses interfacial side reactions. Among them, the large tetrahedral PO43- polyanion doping in the lattice can inhibit the migration of transition metal ions and reduce the volume change due to its stronger bonding with transition metal ions compared to oxygen, thus stabilizing the crystal structure. Moreover, the PO43- doping can expand the lithium layer spacing and promote the diffusion of Li+, thus enhancing the multiplicative performance of the material. In addition, the AlF3 nanolayer coating on the surface of the active material reduces its contact with the electrolyte, which can inhibit the side reaction between the material and the electrolyte and thus enhance the interfacial stability. Based on these advantages, the P-LNCM@AlF3 cathode exhibited excellent electrochemical performance. It exhibited a discharge specific capacity of 179.2 mAh·g-1 at a current density of 1C and 161.5 mAh·g-1 after 200 cycles, with a capacity retention rate of 90.12%. Even at a high current density of 5C, a discharge capacity of 128.8 mAh·g-1 could be achieved. |
| Keywords: Li-rich manganese base material PO43- doping AlF3 coating synergistic modification transition metal ions migration interfacial stability |
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| LUO Bi-Cheng,WU Liang,PENG Yan,FENG Xiang-Yu,ZHOU Ming-Ran,WANG Chen-Yu,LIU Jing,LI Yu.PO43- doping and AlF3 coating synergistically enhancing electrochemical properties of Li1.2Ni0.13Co0.13Mn0.54O2 cathode material[J].Chinese Journal of Inorganic Chemistry,2023,39(11):2131-2142. |
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