期刊
CHEM
卷 8, 期 8, 页码 2163-2178出版社
CELL PRESS
DOI: 10.1016/j.chempr.2022.04.012
关键词
-
资金
- Shenzhen Science and Technology Research Grant [JCYJ20200109140416788]
- Soft Science Research Project of Guangdong Province [2017B030301013]
The search for high-performance cathode materials is an important challenge for lithium-ion batteries. In this study, a strategy of delocalizing superstructure units within transition-metal layers was demonstrated to enhance the layer stability of a Li-excess Mn-rich layered oxide cathode. This resulted in a high capacity and energy density after cycling.
The search for cathode materials with high energy density, long-term cycling stability, and low cost is one of the most important challenges for current lithium-ion batteries. To address the structural instability in Mn-rich layered cathodes, we demonstrate herein through thorough experimental and theoretical studies that delocalizing Li@Mn-6 superstructure units within transition-metal layers is an effective strategy to enhance the layer stability of a Li-excess Mn-rich layered oxide (LMRO) cathode. The delocalized Li@Mn-6 superstructure units can not only increase the Mn valence to inhibit the adverse Jahn-Teller effect but also harness the anionic redox activity with suppressed O-Mn-0 species. Benefited from its stable layered structure, the LMRO cathode can retain a high capacity and energy density of 251 mA h g(-1) and 791 W h kg(-1), respectively, after 100 cycles with nearly 100% retention. This work provides a feasible route to develop the high-performance layered cathodes with stable anionic redox chemistry.
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