Enhancing the electrochemical performances of LiNi0.8Co0.15Al0.05O2 cathode material by anion/cation co-doping


Layered structure LiNi0.8Co0.15Al0.05O2 (NCA) with high energy density is considered to be the most promising cathode material, but poor structural stability hinders its further development. Here, Na+/Br- co-doped NCA (Na&Br-NCA) was prepared via simple solid phase method. Electrochemical studies showed that cation Na+ doping stabilizes the crystal structure, increases the lattice spacing, and reduces the mixing of cations. Anion Br- doping increases the spacing between the plates and forms a weaker Li-Br bond, which is more conducive to the insertion and extraction of Li+. At 2C, Na&Br-NCA exhibited a reversible capacity of 184.1 mAh g1 with retention of 91.5% after 100 cycle and a superior rate performance (160.2 mAh g−1 at 5C) compared to pure NCA that showed 180.1 mAh g−1 with retention of 77.7% and 148.6 mAh g−1 at 5C. The results show that Na+/Br- co-doping is beneficial to stabilize the layered structure, reduce polarization, and promote lithium-ion diffusion of Na&Br-NCA. It also provides inspiration for other cation/anion co-doped modified cathode materials.

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This work received support from the Venture & Innovation Support Program for Chongqing Overseas Returnees (No.cx2019128), the Key Project of Science and Technology Research of Chongqing Education Commission of China (No.KJZDK201801103), the Chongqing Technology Innovation and Application Development project of Chongqing Science and Technology Commission (No.cstc2019jscx-msxmX0358), the Youth project of Science and Technology research program of Chongqing Education Commission of China (No.KJQN201901110), and the Basic and Frontier Research Project of Chongqing Science and Technology Commission (No. cstc2019jcyj-msxmX0165).

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Yang, B., Zhou, L., Hu, X. et al. Enhancing the electrochemical performances of LiNi0.8Co0.15Al0.05O2 cathode material by anion/cation co-doping. Ionics (2021). https://doi.org/10.1007/s11581-021-03947-9

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  • NCA
  • Na+ /Br- co-doped
  • Lithium-ion batteries