Effect of W6+ doping on the electrochemical performance of low-cobalt LiNi0.9Co0.01Mn0.09O2 cathode materials

High-nickel LiNi 0.9 Co 0.01 Mn 0.09 O 2 cathode materials demonstrate significant potential for next-generation lithium-ion batteries (LIBs) due to their high energy density and low cost. However, the reduced cobalt content in these high-nickel materials often results in structural degradation and poor cycling stability. In this work, the material referred to as NCM919 was prepared through a homogeneous co-precipitation method, followed by the introduction of W 6+ doping to enhance cycling stability. The electrochemical performance results indicate that the cathode doped with 1.0 mol% W 6+ (NCM-1.0 W) exhibits improved electrochemical characteristics. NCM-1.0 W shows an initial discharge capacity of 182.74 mAh/g at a rate of 0.5 C, with 97.86% of the initial capacity retained after 100 cycles within a voltage range of 2.5 ~ 4.3 V. Additionally, NCM-1.0 W achieves an initial discharge capacity of 197.99 mAh/g at a rate of 1.0 C, with 85.68% of the initial capacity maintained after 100 cycles in a voltage range of 2.5 ~ 4.5 V.