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Research Article

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

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  • Received: 25 May 2020Revised: 14 July 2020Accepted: 15 July 2020Available online: 17 July 2020
  • To probe the coupling effect of the electron and Li ion conductivity in Ni-rich layered materials (LiNi0.8Co0.15Al0.05O2, NCA), lithium lanthanum titanate (LLTO) nano fiber and carbon-coated LLTO fiber (LLTO@C) materials were introduced to polyvinylidene difluoride, respectively, in the cathode. The enhancement in the conductivity was indicated by the suppressed impedance and polarization. Both at 1C and 5C, 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 5C. 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 was responsible for the 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 preeminent capacity retention. Only NiO phase “pitting” occurred. A mechanism based on the synergistic transport of Li ions and electron was proposed.
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Coupling effect of the conductivity of Li ions and electrons by the introduction of LLTO@C fibers in LiNi0.8Co0.15Al0.05O2 cathode

  • Corresponding author:

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

  • 1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
  • 2. State Center for International Cooperation on Designer Low-carbon & Environmental Materials (CDLCEM), Zhengzhou University, 100 Kexue Avenue, Zhengzhou 450001, China
  • 3. Zhengzhou Materials Genome Institute (ZMGI), Zhongyuanzhigu, Xingyang 450100, China

Abstract: To probe the coupling effect of the electron and Li ion conductivity in Ni-rich layered materials (LiNi0.8Co0.15Al0.05O2, NCA), lithium lanthanum titanate (LLTO) nano fiber and carbon-coated LLTO fiber (LLTO@C) materials were introduced to polyvinylidene difluoride, respectively, in the cathode. The enhancement in the conductivity was indicated by the suppressed impedance and polarization. Both at 1C and 5C, 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 5C. 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 was responsible for the 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 preeminent capacity retention. Only NiO phase “pitting” occurred. A mechanism based on the synergistic transport of Li ions and electron was proposed.

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