The Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ cathode material with excellent electrochemical properties was successfully prepared by treating precursor with KMnO₄. The results indicated that KMnO₄ treatment could depress Li⁺/Ni²⁺ cation mixing degree and extend c axis of the cathode material structure. Simultaneously, the formed spinel phase could improve cycling stability and provide 3D Li⁺ diffusion channels. The modified materials showed the increased discharge capacity, improved capacity retention and the suppressed electrochemical impedance. And the interface stability between the cathode material and electrolyte was greatly improved. The improvement can be assigned to the more ordered crystal structure and the moderate spinel structure.

通过用KMnO ₄处理前驱体，成功制备了电化学性能优异的Li _1.2 Mn _0.54 Ni _0.13 Co _0.13 O ₂正极材料。结果表明，KMnO ₄处理可降低Li ⁺ / Ni ²⁺阳离子的混合度，并延伸阴极材料结构的c轴。同时，形成的尖晶石相可以改善循环稳定性并提供3D Li ⁺扩散通道。改性材料显示出增加的放电容量，改善的容量保持率和抑制的电化学阻抗。正极材料与电解质之间的界面稳定性得到了极大的提高。该改进可以归因于更有序的晶体结构和适度的尖晶石结构。