Reinforcing electrochemical performance of Ni-rich NCM cathode co-modified by mg-doping and Li3PO4-coating

초록

The structural and interfacial degradation of Ni-rich cathode materials during the cycling continuously delays its commercialization of lithium-ion batteries (LIBs). To overcome these drawbacks, we propose a MgHPO4-modified LiNi0.8Co0.1Mn0.1O2 (M-NCM) cathode material. From electrochemical analysis, M-NCM takes the combining advantages of Mg doping and Li3PO4 coating. Interestingly, M-NCM shows a better discharge capacity of 203.5 mAh g(-1), delivering outstanding initial coulombic efficiency of 86.1% compared to the pristine LiNi0.8Co0.1Mn0.1O2. Additionally, M-NCM displays advanced cycle performance with a superior capacity retention of 81.1% after 100 cycles. Furthermore, M-NCM effectively suppresses interfacial undesirable reactions at electrode/electrolyte interface during cycling. Consequentially, this study finds that MgHPO4 surface modification can bring enhanced electrochemical performance of Ni-rich-layered cathode materials for high-energy and long-term LIBs.

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