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Nb-Cl co-doping improved the electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode materials

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Abstract

LiNi0.6Co0.2Mn0.2O2 cathode material has been widely studied by researchers due to its high capacity, but its further development is restricted by low rate capacity, poor interface stability, and poor structural stability. Nb-Cl co-doped LiNi0.6Co0.2Mn0.2O2 cathode materials were prepared by solid-phase method. Structural analysis revealed that Nb and Cl elements were uniformly incorporated into the crystal structure. Electrochemical results show that the optimal co-doping amounts of Nb and Cl are 1% and 2%, and the modified LiNi0.6Co0.2Mn0.2O2 cathode material exhibits higher discharge capacity and cycle stability. At 0.5 C, the capacity retention rate was 90.80% after 100 cycles at a cut-off voltage of 3.0–4.6 V, much higher than that of the pristine sample which was 81.17%. In addition, the modified sample can still maintain a reversible capacity of 148.0 mAh g−1 even at 5 C. This is attributed to the synergistic effect of anion-cation co-doping, which effectively inhibits the phase transition process on the surface of the material in a highly delithiated state, slows down the structural collapse during cycling, and promotes the reversible intercalation/extraction of Li+. EIS and GITT tests also proved that Nb-Cl co-doping reduces the charge transfer resistance (Rct) and effectively increases the lithium ion diffusion rate.

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This experiment was conducted independently by us, we have full access to all data in this study, and we are fully responsible for the integrity of the data and the accuracy of the data analysis.

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Authors and Affiliations

  1. The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education. School of Chemistry and Materials Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, People’s Republic of China

    Bin Pan, Hailang Zhang & Yuling Weng

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  1. Bin Pan
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  2. Hailang Zhang
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  3. Yuling Weng
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Hailang Zhang contributed to the conception of the study; Bin Pan performed the experiments and the data analyses and wrote the manuscript; and Yuling Weng helped perform the analysis with constructive discussions.

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Correspondence to Hailang Zhang.

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Pan, B., Zhang, H. & Weng, Y. Nb-Cl co-doping improved the electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode materials. Ionics 29, 4495–4507 (2023). https://doi.org/10.1007/s11581-023-05196-4

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