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Rational synthesis of a [email protected]o-Ni LDH heterostructure and derived heterogeneous carbon-based framework as a highly efficient multifunctional sulfur host

  • Li, Hongtai
  • Jin, Quan
  • Zhao, Jie
  • Wang, Bao
  • Guo, Xiaodong
Publication Date
Sep 28, 2020
Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
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A facile one-pot surfactant-free solvothermal method was developed to synthesize [email protected] layered double hydroxide (LDH) heterostructures. By rationally controlling the sequential growth of ZIF-67 and re-precipitation process of 2-MeIM-inserted Co-Ni LDHs, a series of heterogeneous [email protected] LDH polyhedra with controllable void space and final hollow Co. Ni LDH polyhedra were obtained through in situ transformation. Typical core-shelled [email protected] LDHs, yolk-shelled [email protected] LDHs, hollow Co-Ni LDHs, and conventional ZIF-67 were calcined to obtain the derivatives that inherit the morphological characteristics of their corresponding precursors. Due to structural and compositional advantages, the derived core-shelled heterogeneous carbon-based framework composed of a cobalt particle anchored graphitic mesoporous N-doped carbon core and partially reduced Co- Ni layered double oxide (LDO) embedded shell of edge-to-face stacking defective carbon nanosheets exhibited outstanding physical and chemical properties required for high-performance sulfur carrier materials. When employed as a sulfur host, this multifunctional core-shelled carbonaceous derivative smoothly promoted the "immobilization-diffusion conversion-deposition" process of polysulfides. The as-fabricated sulfur cathode exhibited a remarkably improved electrochemical performance with a high initial discharge specific capacity of 1140 mA h g s(-1) at 0.2C and a high retention of 769 mA h g s(-1) after 400 cycles at 1C, demonstrating its high utilization of sulfur and effective suppression of the "shuttle effect".

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