Spinel-structured lithium nickel manganese oxide decorated LiNi0.83Co0.11Mn0.06O2 cathode material with stable structure and excellent performance for Li-ion batteries

Developing battery materials with high specific energy and long cycle life is a crucial core technology that needs to be broken. High-nickel and high-voltage are the development trends of cathode materials, but the structural instability seriously deteriorate electrochemical performance. Herein, to solve the above problem and obtain structurally stable high-voltage nickel-rich cathode materials, a novel high-voltage spinel-structured cladding layer was designed by wet chemistry and coated on the surface of LiNi_0.83Co_0.11Mn_0.06O₂ material. LiNi_0.5Mn_1.5O₄ with spinel structure possesses good structural compatibility with layered cathode materials and has efficient three-dimensional Li-ion diffusion paths, which can meet the needs of Li-ion diffusion kinetics. Meanwhile, LiNi_0.5Mn_1.5O₄ has a high operating voltage and a very stable thermodynamic structure in the charging state which can inhibit the corrosion and interfacial side reactions of the cathode material, thus stabilizing the crystal structure. The results show that 1 wt% LiNi_0.5Mn_1.5O₄-coated sample displayed the best electrochemical performance, with a discharge capacity of 203.7 mAh g⁻¹ at 1 C, the capacity retention of 77.71% after 200 cycles, and even after 300 cycles, the capacity retention still reached 64.36%.