Corresponding Author

Jian-qiang WANG(wangjianqiang@sinap.ac.cn);
Yong-yao XIA(yyxia@fudan.edu.cn)


A series of the lithium-rich and manganese-based layered structure xLi2MnO3•(1-x)LiMn1/3Ni1/3Co1/3O2 (x = 0.3,0.5,0.7) materials were synthesized by a co-precipitation method, and followed by a solid-state reaction process. By comparing the first cycle efficiency, the reversible discharge capacity, the cycling stability and the voltage decay during the charge/discharge cycling process, the material with the composition of 0.5Li2MnO3•0.5LiMn1/3Ni1/3Co1/3O2was found to show the best electrochemical performance. The lithium storage mechanism and thermal stability of the de-lithiated compound were also investigated by in situ X-ray absorption fine structure (XAFS) spectroscopy and differential scanning calorimetry (DSC) techniques. The results of XAFS indicates that during the charging process to 4.5 V, the Ni and Co ions are oxidized to Ni4+ and Co4+, respectively, while the Mn ion remains Mn4+.

Graphical Abstract


lithium-rich layered oxides, cathode material, lithium-ion battery, in situ X-ray absorption fine structure

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