Synthesis of LiNi_0.10Zn_xMn_1.90-xO₄ (x ≤ 0.15) cathode materials synthesized by solid state combustion and its electrochemical properties

LiNi_0.10Zn_xMn_1.90-xO₄ (x≤0.15) cathode materials were synthesized by solid phase combustion method. XRD and SEM show that all samples belong to spinel structure typical of LiMn₂O₄ material, no impurity formation. And all of them are spheroidal polyhedrons with good dispersibility and high crystallinity, the particle size is 100—200 nm. Among them, the LiNi_0.10Zn_0.02Mn_1.88O₄ sample has a relatively small particle size of 130 nm. The results of electrical performance show that the LiNi_0.10Zn_0.02Mn_1.88O₄ sample has excellent cycle stability and rate performance, and it maintains a capacity retention rate of 76.3% after 1 000 cycles at 1 C. At higher rates of 5 C, 10 C and 20 C, higher specific capacities of 98.0, 91.7 and 88.8 mA·h·g⁻¹are released, respectively. It shows optimal electrochemical performance.