Molybdenum Ion Doping for Enhanced Performance of High-Nickel LiNi0.8Co0.1Mn0.1O2Ternary Cathodess

To enhance the structural and chemical stability of LiNi0.8Co0.1Mn0.1O2 (NCM811), a series of Mo-doped NCM811 electrolytes (Mox-NCM811, x = 0-0.03) were synthesized via high-energy mechanical ball milling followed by high-temperature sintering. XRD phase analysis, GASA II refinement, and SEM characterization revealed that appropriate Mo doping effectively reduces the ion migration impedance, enhances Li+ diffusion coefficient, and stabilizes the material structure, thereby improving both discharge specific capacity and cycling performance. When the Mo doping level reaches x=0.02, the optimized material demonstrates a first-cycle discharge capacity of 213.4 mAh/g at 0.1C rate and maintains 88.51% capacity retention after 100 cycles at 1C rate, significantly surpassing the undoped sample's 84% retention. Notably, the capacity retention remains at 89.4% even after multiple rate cycling tests (various rates for 5 cycles each) followed by returning to 0.1C rate.