Distribution of relaxation times investigation of Co$^{3+}$ doping lithium-rich cathode material Li[Li$_{0.2}$Ni$_{0.1}$Mn$_{0.5}$Co$_{0.2}$]O$_2$

Bulletin of Materials Science

WANWAN LI^1¹ 

[1] The State Key Laboratory Base of Novel Functional Materials and Preparation Science, The Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, People’s Republic of China^1

关键词: Electrochemical impedance spectroscopy;    DRTs;    lithium rich;    cathode material;    Tikhonov regularization.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The element Co$^{3+}$ was introduced into lithium-rich material 0.5Li$_2$MnO$_3$ $\cdot$ 0.5LiNi$_{0.5}$Mn$_{0.5}$O$_2$ by apolyacrylamide-assisted sol–gel method to form Li[Li$_{0.2}$Ni$_{0.1}$Mn$_{0.5}$Co$_{0.2}$]O$_2$ and better electro-chemical performances were observed. Electrochemical impedance spectroscopy spectra were measured on 11 specific open circuit voltage levels on the initial charge profile. Then they were converted to the distribution of relaxation times (DRTs) $g(\tau)$ by self-consistent Tikhonov regularization method. The obtained DRTs offered a higher resolution in the frequency domain and providedthe number and the physical origins of loss processes clearly. Through the analysis of DRTs, the rapid augmentation of resistance to electronic conduction and charge transfer within the voltage range 4.46–4.7 V where the removal of Li$_2$O from Li$_2$MnO$_3$ component took place was the most remarkable phenomenon and the Co$^{3+}$ doping greatly reduced the resistanceto electronic conduction Re. This gave us more evidence about the complicated ‘structurally integrated’ composite character of the material.

【 授权许可】

CC BY