Understanding the roles of Ti on the structure and electrochemical performances of Li2Ru1-xTixO3 cathode materials for Li-ion batteries

Hu Zhao; Yanchao Shi; Li Xue; Yingzhi Cheng; Zhongbo Hu; Xiangfeng Liu

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Understanding the roles of Ti on the structure and electrochemical performances of Li2Ru1-xTixO3 cathode materials for Li-ion batteries

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The lattice doping has been widely used to improve the electrochemical performances of Li-rich cathode materials but the roles of the introduced foreign atoms are still not very clear.Herein,a series of Li2Ru1-xTixO3 solid solutions have been synthesized and the roles of Ti doping on the structural and electrochemical properties of Li2RuO3 have been comprehensively investigated.The Rietveld refinement exhibits that the interlayer spacing gradually shortens with increasing Ti content.This shrinkage is favorable to the layered structure stability but increases the lithium diffusion barrier.Galvanostatic measurements show that Li2Ru0.8Ti0.2O3 possesses the best cyclability with 196.9 and 196.1 m Ah g-1for charge and discharge capacity retaining after 90 cycles,respectively.Cyclic voltammetry scanning indicates that Ti dopant promotes the formation of more peroxo-or superoxo-like species but reduces the initial coulumbic efficiency.Results of electrochemical impedance spectroscopy display that Ti doping reduces the charge transfer impedance,which facilitates the lithium-ion diffusion across the electrolyteelectrode interface and improves the electronic conductivity.Li2Ru0.8Ti0.2O3exhibits the best electrochemical performance owing to the balance among all the factors discussed above.This study also offers some new insights into optimizing the electrochemical performances of Li-rich cathode materials through the lattice doping.

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《天然气化学（英文版）》 |2019年第6期|9-16|共8页
作者
Hu Zhao; Yanchao Shi; Li Xue; Yingzhi Cheng; Zhongbo Hu; Xiangfeng Liu;
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College of Materials Science and Optoelectronic Technology University of Chinese Academy of Sciences Beijing 100049 China;

Inner Mongolia Synthetic Chemical Institute Hohhot 010072 Inner Mongolia China;

School of Chemical Engineering Shandong University of Technology Zibo 255049 Shandong China;

School of Chemical Engineering Shandong University of Technology Zibo 255049 Shandong China;

College of Materials Science and Optoelectronic Technology University of Chinese Academy of Sciences Beijing 100049 China;

College of Materials Science and Optoelectronic Technology University of Chinese Academy of Sciences Beijing 100049 China;

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Understanding the roles of Ti on the structure and electrochemical performances of Li2Ru1-xTixO3 cathode materials for Li-ion batteries

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