Simultaneous Li2MoO4 coating and Mo6+ doping improves the structural stability and electrochemical properties of nickel-rich LiNi0.83Co0.11Mn0.06O2

High-nickel ternary material LiNixCoyMn1-x-yO2 (NCM) as a cathode material of Li-ion batteries has already been applied in many fields, like electric vehicles and 3C, due to its low cost and outstanding energy storage performance. but fast capacity decays result from interfacial degradation and internal destruction of the NCM structure leading to poor cycle life during charge-discharge processes, hindering widespread application. To solve these problems, this work develops a modification scheme to achieve the one-step generation of a Li2MoO4 coating on the outside of LiNi0.83Co0.11Mn0.06O2 particles and dope high-valence cations (Mo6+) inside LiNi0.83Co0.11Mn0.06O2 while reducing the residual Li content on the outside of materials. At 1C(1C = 200mAhg(-1)), the modified sample, Mo + NCM-1.0 (1.0 mol% doped LiNi0.83Co0.11Mn0.06O2), exhibits an excellent discharge capacity of 202 mAhg(-1) and cycling stability with a capacity retention of 90.22%. By contrast, pristine LiNi0.83Co0.11Mn0.06O2 shows the discharge capacity is 189.27 mAhg(-1) with a capacity retention of 87.93%. Further research shows that the modification scheme can alleviate the electrode loss during cycling, stabilize the internal structure of the NCM, enhance the Li+ diffusion rate, and improve the electrochemical properties. This modification strategy can be applied to other cathode materials.