• XIAOLIN YAO

      Articles written in Bulletin of Materials Science

    • 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$_2$

      WANWAN LI YUE LI XIAOLIN YAO MINHUA FANG MIAO SHUI JIE SHU YUANLONG REN

      More Details Abstract Fulltext PDF

      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.

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