Abstract
The introduction of copper (Cu) element to iron-manganese-based layered cathode materials can effectively enhance their cycling stability and air tolerance. However, the low redox reactivity of Cu2+ decreases the capacity of the copper-iron-manganese layered oxide cathode material. Recently, lithium (Li) doping has been regarded as an efficient strategy to exploit high-capacity cathode materials by enabling high-covalency transition metals. Here, we report a Na1.0LixCu0.22Fe0.30Mn0.48O2 (x = 0.025, 0.05, 0.075) cathode material with increased capacity by adding Li into a Na1.0Cu0.22Fe0.30Mn0.48O2 cathode via a simple solid-phase sintering method. The doped Li element can regulate the redox reactivities of the adjacent Fe and Mn elements, leading to the promotion of the Fe redox reactivity and the suppression of Mn redox reactivity, which prevents both the Jahn–Teller effect and the structure collapse during the charge/discharge process. In conclusion, Li doping can not only improve the capacity of the cathode material but also improve its stability. When x = 0.075, the capacity of Na1Li0.075Cu0.22Fe0.30Mn0.48O2 cathode can reach 114.2 mAh g−1 with a high capacity retention of 90.2% after 300 cycles at 1 C. These results shed light on the role play of Li in the transition metal layer, and can guide the design and modification for high-performance SIBs of layered materials.
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Acknowledgments
Yuanliang Yuan and Xin Wang contributed equally to this work. This work was financially supported by the National Natural Science Foundation of China (No. 52172184), Sichuan Natural Science Foundation (No. 2022NSFSC0259) and the Fundamental Research Funds for the Central Universities (No. ZYGX2019J024).
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Yuan, Y., Wang, X., Jiang, J. et al. Li-Doped Layered Na1.0Cu0.22Fe0.30Mn0.48O2 Cathode with Enhanced Electrochemical Performance for Sodium-Ion Batteries. J. Electron. Mater. 52, 3509–3516 (2023). https://doi.org/10.1007/s11664-023-10344-7
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DOI: https://doi.org/10.1007/s11664-023-10344-7