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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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Published in: | Journal of applied electrochemistry 2024, Vol.54 (12), p.2699-2713 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites |
Online Access: | Get full text |
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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 |
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ISSN: | 0021-891X 1572-8838 |
DOI: | 10.1007/s10800-024-02133-9 |