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Enhancing electrochemical performance of lithium-rich manganese-based cathode materials through lithium sulfate coating

The surface modification of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 cathode material is carried out by heat treatment of the mixtures of Mn 0.75 Ni 0.25 C 2 O 4 and (NH 4 ) 2 SO 4 absorbed on the surface of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 material. The structural analysis by XRD, XPS, FTIR, and Raman...

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Bibliographic Details
Published in:Journal of applied electrochemistry 2024, Vol.54 (12), p.2699-2713
Main Authors: Zhang, Yue, Yang, Wenyan, Zhi, Songhui, Bai, Mulin, Liao, Zijun, Yang, Wei, Zou, Hanbo, Chen, Shengzhou
Format: Article
Language:English
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Summary:The surface modification of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 cathode material is carried out by heat treatment of the mixtures of Mn 0.75 Ni 0.25 C 2 O 4 and (NH 4 ) 2 SO 4 absorbed on the surface of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 material. The structural analysis by XRD, XPS, FTIR, and Raman spectroscopy demonstrates that Li 2 SO 4 and metal oxides exist in the coating layer. The loading of coating layer and the calcination temperature play a crucial role in the initial Coulomb efficiency and cyclic stability of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 cathode material. Compared with the pristine and metal oxide-coated sample, modified Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 with Li 2 SO 4 coating exhibits higher first discharge specific capacity (233 mAh g −1 at 0.1 A g −1 ) and longer cyclic stability (retention of 94.7% at 1 A g −1 ). The enhancement of the electrochemical performance can be attributed to the increased reversibility Mn 3+ /Mn 4+ redox reaction and the reduced irreversible migration of transition metal ion. Graphical abstract
ISSN:0021-891X
1572-8838
DOI:10.1007/s10800-024-02133-9