Abstract
By virtue of high discharge capacity and wide voltage range, lithium-rich layered oxides (LLO) are expected to become the most promising cathode materials for high-energy lithium-ion batteries. However, there are still some challenges that hinder the commercial application of LLO. In this work, the conversion of structure (layered to spinel) is inhibited through La-doping, which enhances the cycle performance and relieves voltage decay of LLO. A pinch of La-doping can prevent the migration of transition metal (TM) ions and stabilize crystal structure. As a result, the La-doped lithium-rich layered oxide (LaLLO) exhibit higher discharge specific capacity of 164.1 mAh g−1 (vs. 127.4 mAh g−1) with a cycle retention rate of 78.3% (vs. 61.0%) after 300 cycles at 1C. At the same time, LaLLO demonstrated better voltage stability with an average voltage decay of 1.5 mV per cycle (vs. 2.0 mV per cycle). In addition, irreversible release of O2− is restrained due to the stronger La–O bond, the initial coulomb efficiency can be enhanced from 73.2% to 82.4%.
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Acknowledgements
This work was supported by Sichuan Science and Technology Program (2019ZDZX0029). The authors would like to acknowledge the experimental facilities provided by Sichuan LüXin Power Technology Co., Ltd.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by YQ. The first draft of the manuscript was written by YQ and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Qian, Y., Duan, J., Wu, Q. et al. A facile lanthanum-doping strategy for enhancing the long-cycle performance of lithium-rich layered oxides. J Mater Sci: Mater Electron 33, 3151–3161 (2022). https://doi.org/10.1007/s10854-021-07517-7
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DOI: https://doi.org/10.1007/s10854-021-07517-7