Li-rich manganese layered cathode materials doped with W

Lithium-rich manganese materials have high specific capacity and charge-discharge voltage platform, but large irreversible capacity. The bonding between transition metals and oxygen was enhanced by W doping in lithium-rich manganese cathode materials, with inhibited lattice oxygen shedding during the first charge-discharge process. Meanwhile, XRD refinement results showed that W-doping increased the interlayer spacing of lithium-rich manganese layered materials, promoted the diffusion of lithium ions, reduced the electrochemical impedance of materials, with an effective improvement of the cycle stability and rate performance of materials. Electrochemical tests show that the performance is the most favorable when W is doped at 3%, and the discharge specific capacities at 0.2 C, 3 C and 5 C are 211.3 mAh/g, 132.6 mAh/g and 114.61 mAh/g, respectively, which are 10.5%, 7.8% and 12.58% higher than those of undoped lithium-rich manganese materials.