Effect of Na Doping on Electrochemical Properties of Cobalt-Free Li-Rich Mn-Based Cathode Materials

Abstract

Na doping is introduced to improve the electrochemical properties of Li_1.2Mn_0.6Ni_0.2O₂ cathode material, which is synthesized by sol–gel method. The effect of Na doping on the morphological, structural and electrochemical properties was systematically studied and analyzed. These results illustrate that lattice layer spacing is enlarged by Na doping, which is beneficial for the diffusion of Li-ion, and the voltage fading is successfully suppressed. The best electrochemical properties were obtained when Na doping amount is approximately 1%, which is attributed to the stronger structural stability and better reversibility of Li⁺ during the initial charge and discharge process.

Keywords:

• Na doping
• electrochemical properties
• Li-rich
• cathode materials

Additional information

Funding

This work was supported by National Natural Science Foundation of China (No. 51701173) and Key Scientific Research Project of Colleges and Universities in Henan Province (No. 19A610008).