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

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2022-08, Vol.1 (31), p.16555-16569
• Main Authors: Hwang, Do-Young, Kim, Hyun-Soo, Lee, Seung-Hwan
• Format: Article
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/d1ta08441k

A Ni-rich layered cathode (LiNi 0.8 Co 0.1 Mn 0.1 O 2 , 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 Li 3 PO 4 -coated NCM cathode material. The electrochemical results reveal that MgHPO 4 -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, MgHPO 4 -modified NCM maintains a superior cycling performance of 86.3% after 100 cycles at 25 °C. Most importantly, MgHPO 4 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. A Ni-rich layered cathode (LiNi 0.8 Co 0.1 Mn 0.1 O 2 , NCM) is a highly promising cathode material for lithium-ion batteries (LIBs).