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Open Access Publications from the University of California

Highly graphitized carbon coating on SiO with a π-π stacking precursor polymer for high performance lithium-ion batteries

  • Author(s): Fang, S
  • Li, N
  • Zheng, T
  • Fu, Y
  • Song, X
  • Zhang, T
  • Li, S
  • Wang, B
  • Zhang, X
  • Liu, G
  • et al.

© 2018 by the authors. A highly graphitized carbon on a silicon monoxide (SiO) surface coating at low temperature, based on polymer precursor π-π stacking, was developed. A novel conductive and electrochemically stable carbon coating was rationally designed to modify the SiO anode materials by controlling the sintering of a conductive polymer, a pyrene-based homopolymer poly (1-pyrenemethyl methacrylate; PPy), which achieved high graphitization of the carbon layers at a low temperature and avoided silicon carbide formation and possible SiO material transformation. When evaluated as the anode of a lithium-ion battery (LIB), the carbon-coated SiO composite delivered a high discharge capacity of 2058.6 mAh/g at 0.05 C of the first formation cycle with an initial Coulombic efficiency (ICE) of 62.2%25. After 50 cycles at 0.1 C, this electrode capacity was 1090.2 mAh/g (~82%25 capacity retention, relative to the capacity of the second cycle at 0.1 °C rate), and a specific capacity of 514.7 mAh/g was attained at 0.3 C after 500 cycles. Furthermore, the coin-type full cell composed of the carbon coated SiO composite anode and the Li[Ni0.5Co0.2Mn0.3O2] cathode attained excellent cycling performance. The results show the potential applications for using a π-π stacking polymer precursor to generate a highly graphitize coating for next-generation high-energy-density LIBs.

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