Journal
NANO LETTERS
Volume 21, Issue 19, Pages 8370-8377Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02923
Keywords
lithium-rich layered oxides; Fe; codoping; stability; low cost
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Funding
- National Key Research and Development Program of China [2019YFA0210600]
- National Natural Science Foundation of China [21805185, 21905174]
- Shanghai Rising-Star Program [20QA1406600]
- SPST of ShanghaiTech University [EM02161943]
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This study reports a Fe, Cl co-doped and Co-free Li-rich layered cathode, which significantly improves structural stability, enhances rate performance, and provides a low-cost, environmentally friendly strategy for high-performance cathode materials.
Lithium-rich layered oxides have received great attention due to their high energy density as cathode material. However, the progressive structural transformation from layered to spinet phase triggered by transition-metal migration and the irreversible release of lattice oxygen leads to voltage fade and capacity decay. Her; we report a Fe, Cl codoped and Co-free Li-rich layered cathode with significantly improved structural stability. It is revealed that the Fe and Cl codoping can facilitate the Li-ion diffusion and improve the rate performance of the materials. Moreover, the calculations show that the structural stability is enhanced by Fe and Cl codoping. As a result, the Fe and Cl codopant reduces the irreversible release of lattice oxygen, mitigates voltage fade, and improves the first-cycle Coulombic efficiency. This work provides a low-cost, environmentally friendly, practical strategy for high-performance cathode materials.
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