Enhancing the electrochemical performance of Li-rich cathode material by a flexible precursor treatment method

Abstract The Li1.2Mn0.54Ni0.13Co0.13O2 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.