Highly stable and high-performance MgHPO4 surface-modified Ni-rich cathode materials for advanced lithium ion batteries

초록

A Ni-rich layered cathode (LiNi0.8Co0.1Mn0.1O2, NCM) is a highly promising cathode material for lithium-ion batteries (LIBs). However, LIBs face crucial challenges of its structural degradation and interfacial instability during the cycling process. In this paper, we successfully design a Mg-doped and Li3PO4-coated NCM cathode material. The electrochemical results reveal that MgHPO4-modified NCM shows not only an advanced initial discharge capacity of 203.5 mA h g(-1) but also the highest rate capability of 89.4% at 6.0C. More importantly, MgHPO4-modified NCM maintains a superior cycling performance of 86.3% after 100 cycles at 25 degrees C. Most importantly, MgHPO4 dual-modification on the NCM particle can immunize against the phase transition from the layered phase to the rock-salt phase. Therefore, this study proposes a novel strategy for improving the NCM cathode material to accelerate its commercialization.

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