Building Ultrathin Li4Mn5O12 Shell for Enhancing the Stability of Cobalt-Free Lithium-Rich Manganese Cathode Materials

Spinel Li4Mn5O12 was successfully prepared by the wet chemical method to modify the surface of Li1.2Ni0.2Mn0.6O2. The results showed that an ultrathin spinel Li4Mn5O12 surface-modified layer with a thickness of approximately 10 nm was successfully constructed on the raw material surface, and that th...

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Bibliographic Details
Published in:Batteries (Basel) 2023-02, Vol.9 (2), p.123
Main Authors: Qiu, Yuhong, Peng, Xuefeng, Zhou, Lichun, Yan, Jie, Song, Yaochen, Bi, Linnan, Long, Xin, He, Liang, Xie, Qingyu, Wang, Sizhe, Liao, Jiaxuan
Format: Article
Language:English
Subjects:
Cathodes
Cations
Cobalt
cobalt-free lithium-rich manganese oxide
Composite materials
Crystal structure
Diffusion rate
Electrode materials
Electrodes
Energy storage
Ion diffusion
Li4Mn5O12-coated
Lithium
Lithium ions
lithium-ion battery
Manganese
Microscopy
Morphology
Phase transitions
positive electrode
Raw materials
Shell stability
Spinel
Thickness
Work stations
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Summary:Spinel Li4Mn5O12 was successfully prepared by the wet chemical method to modify the surface of Li1.2Ni0.2Mn0.6O2. The results showed that an ultrathin spinel Li4Mn5O12 surface-modified layer with a thickness of approximately 10 nm was successfully constructed on the raw material surface, and that the cationic order was improved. In addition, the lithium ion diffusion coefficients (DLi+) of the raw materials and the modified materials were calculated using the EIS test and impedance fitting. The results indicated that the ultrathin Li4Mn5O12 surface modification shell can increase the lithium ion diffusion rate of the material and improve the rate capability of the material. So, the surface modification layer of spinel Li4Mn5O12 can reduce the oxygen loss of the first cycle and improve the cationic order of the material. Therefore, the first coulombic efficiency of Li4Mn5O12/Li1.2Ni0.2Mn0.6O2 material at the current density of 12.5 mA·g−1 reaches 80.46%, and the capacity retention rate reaches 91.74% after 50 cycles, which are 3.36% and 21.23% higher than those of the raw materials, respectively. It showed better electrochemical reversibility and cyclic stability. This study provides a straightforward and convenient modification method for improving the stability of cobalt-free lithium-rich manganese cathode materials and has a favorable application prospect.
ISSN:2313-0105
2313-0105
DOI:10.3390/batteries9020123