Abstract
LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode materials are susceptible to irreversible phase changes and surface side reactions between electrode materials and electrolyte during charging and discharging, which represent a severe danger to the safety and electrochemical performance of batteries. Li\(_{{1.06-x}}\)NaxNi0.5Co0.2Mn0.3O\(_{{2-y}}\)Cly cathode materials co-doped with Na+ and Cl– were prepared by a simple co-precipitation method. The effects of crystal structure, morphology and electrochemical properties were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and charge-discharge performance tests. The results show that the doping of Na+ and Cl– reduces the mixing of cations and expands the diffusion channels of Li+. Currently, the doped 1%-NCM has a high charge-discharge capacity and the best cycling performance (187.56 mA h g–1 at 1 C with the highest capacity retention at 76.29% after the first cycle). After 50 cycles, the specific capacity retention was 138.33 mA h g–1, which increased the capacity retention by 18.58% compared with the unmodified material, indicating that the co-doping of anions and cations improved the Li+ de-embedding ability as well as the specific capacity.
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The authors gratefully acknowledge supports by the Natural Science Foundation of Liaoning Province (no. 2020-BS-154).
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Yang, X., Dai, S., Li, H. et al. Preparation and Electrochemical Investigation of Na and Cl Co-Doped LiNi0.5Co0.2Mn0.3O2 Cathode Materials. Russ. J. Phys. Chem. 97, 3168–3173 (2023). https://doi.org/10.1134/S003602442313023X
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DOI: https://doi.org/10.1134/S003602442313023X