Hao-yang Wang, Xue Cheng, Xiao-feng Li, Ji-min Pan, and Jun-hua Hu, Coupling effect of the conductivities of Li ions and electrons by introducing LLTO@C fibers in the LiNi0.8Co0.15Al0.05O2 cathode, Int. J. Miner. Metall. Mater., 28(2021), No. 2, pp. 305-316. https://doi.org/10.1007/s12613-020-2145-6
Cite this article as:
Hao-yang Wang, Xue Cheng, Xiao-feng Li, Ji-min Pan, and Jun-hua Hu, Coupling effect of the conductivities of Li ions and electrons by introducing LLTO@C fibers in the LiNi0.8Co0.15Al0.05O2 cathode, Int. J. Miner. Metall. Mater., 28(2021), No. 2, pp. 305-316. https://doi.org/10.1007/s12613-020-2145-6
Research Article

Coupling effect of the conductivities of Li ions and electrons by introducing LLTO@C fibers in the LiNi0.8Co0.15Al0.05O2 cathode

+ Author Affiliations
  • Corresponding author:

    Jun-hua Hu    E-mail: hujh@zzu.edu.cn

  • Received: 25 May 2020Revised: 12 July 2020Accepted: 15 July 2020Available online: 17 July 2020
  • To probe the coupling effect of the electron and Li ion conductivities in Ni-rich layered materials (LiNi0.8Co0.15Al0.05O2, NCA), lithium lanthanum titanate (LLTO) nanofiber and carbon-coated LLTO fiber (LLTO@C) materials were introduced to polyvinylidene difluoride in a cathode. The enhancement of the conductivity was indicated by the suppressed impedance and polarization. At 1 and 5 C, the cathodes with coupling conductive paths had a more stable cycling performance. The coupling mechanism was analyzed based on the chemical state and structure evolution of NCA after cycling for 200 cycles at 5 C. In the pristine cathode, the propagation of lattice damaged regions, which consist of high-density edge-dislocation walls, destroyed the bulk integrity of NCA. In addition, the formation of a rock-salt phase on the surface of NCA caused a capacity loss. In contrast, in the LLTO@C modified cathode, although the formation of dislocation-driven atomic lattice broken regions and cation mixing occurred, they were limited to a scale of several atoms, which retarded the generation of the rock-salt phase and resulted in a pre-eminent capacity retention. Only NiO phase “pitting” occurred. A mechanism based on the synergistic transport of Li ions and electrons was proposed.
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