Abstract
Cathodes must accommodate the excellent performance of the applied anodes in lithium batteries. Li-rich Mn-based cathode materials with a specific capacity beyond 250 mAh·g−1 are considered some of the most promising cathode materials, although they suffer from some unsolved problems. In this paper, a series of Li1.2Ni0.2Mn0.6-xAlxO2 cathodes with an in situ-synthesized Li2CO3 coating layer by a one-step method is utilized to enhance their electrochemical performance by inhibiting the transition from a layered structure to a spinel structure and reducing the generation of Mn3+. The Li1.2Ni0.2Mn0.56Al0.04O2@Li2CO3 coating sample exhibits an excellent capacity retention rate of 89.5% and a small voltage decay of 1.11 mV per cycle after 200 cycles at 1 C. Lithium-ion full cells composed of Li1.2Ni0.2Mn0.56Al0.04O2@Li2CO3 and graphite show an energy density of 443.7 Wh·kg−1 at 0.1 C, and the capacity retention rate is 95.6% after 200 cycles at 1 C. These results offer prospects for satisfying the high energy density requirements of electric equipment.
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Funding
This work was financially supported by the Qian Ke He Ji Chu-ZK [2021]Yi Ban 236, the Guizhou Science and Technology Planning Project [2020]5021, the Potential Subject Project of Guizhou University GZUQLXK21006, the Guizhou High Level and Innovative Talents Projects [2022]009–1, and the Natural Science Research Project of Guizhou Provincial Department of Education [2022]041.
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Huo, YL., Gu, YJ., Chen, ZL. et al. Enhanced electrochemical performance of Li1.2Ni0.2Mn0.6-xAlxO2 cathodes in an in situ Li2CO3 coating by a one-step method. Ionics 29, 71–85 (2023). https://doi.org/10.1007/s11581-022-04804-z
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DOI: https://doi.org/10.1007/s11581-022-04804-z