Collaboratively enhancing electrochemical properties of LiNi0.83Co0.11Mn0.06O2 through doping and coating of quadrivalent elements
Ni-rich layered oxides (Ni ≥ 80%) with high energy density have become a mainstream cathode material for Li-ion batteries. However, irreversible phase transitions and interface instability are deep-seated challenges in commercializing Ni-rich materials. This study used a collaborative modification s...
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Veröffentlicht in: | Rare metals 2023-12, Vol.42 (12), p.4103-4114 |
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Hauptverfasser: | , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Ni-rich layered oxides (Ni ≥ 80%) with high energy density have become a mainstream cathode material for Li-ion batteries. However, irreversible phase transitions and interface instability are deep-seated challenges in commercializing Ni-rich materials. This study used a collaborative modification strategy involving doping and coating with quadrivalent elements to construct Ni-rich materials. In particular, introducing tetravalent Zr makes the valence change of Ni (2+ to 4+) more accessible to complete spontaneously during the charging and discharging processes, which significantly suppresses the cationic mixing and irreversible phase transition (H2 ↔ H3). Combining the strategy of constructing CeO
2
coatings on the surface and interfacial spinel-like phases improves the Li
+
diffusion kinetics and interfacial stability. Simultaneously, part of the strongly oxidizing four-valence Ce
4+
diffuses to the surface layer, further increasing the average valence state of Ni. Therefore, LiNi
0.83
Co
0.11
Mn
0.06
O
2
(NCM)-Zr@Ce achieves 78.5% outstanding retention at 1.0C after 200 cycles within 3.0–4.3 V compared to unmodified NCM with 41.4% retention. The improved cyclic stability can be attributed to the collaborative modification strategy of the quadrivalent elements, which provides an effective synergistic modification strategy for developing high-performance Li-ion battery cathode materials.
Graphical abstract |
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ISSN: | 1001-0521 1867-7185 |
DOI: | 10.1007/s12598-023-02356-3 |