Poly-dopamine carbon-coated stable silicon/graphene/CNT composite as anode for lithium ion batteries

Fangfang Wang, Song Lin, Xuesong Lu, Ruoyu Hong, Huiyong Liu

Research output: Contribution to journalArticlepeer-review

2 Citations (SciVal)

Abstract

To buffer the volume expansion of silicon during charge-discharge process, a 3D carbon-coated stable silicon/graphene/CNT (C@Si/GN/CNT/PDA-C) composite was prepared. Si nanoparticles (SiNPs) were first modified by hexadecyl trimethyl ammonium bromide (CTAB) to enhance their stability and dispersibility in water, then uniformly distributed in graphene/carbon nanotubes (GN/CNT) by electrostatic self-assembly, and ultimately encapsulated by carbonized poly-dopamine carbon layer (PDA-C) at high-temperature. PDA-C not only alleviates the volume expansion of Si and inhibits the direct contact of Si with electrolyte, but also acts as a bridge between the conductive GN/CNT and Si to maintain electrode integrity. As an anode material for lithium-ion batteries, the C@Si/GN/CNT/PDA-C exhibits a superior reversible capacity of 1946 mAh g − 1 after 100 cycles with the capacity retention of 68.9% at a current density of 0.1 A g − 1, and over 1306 mAh g − 1 after 100 cycles at 1 A g − 1. The excellent electrochemical performance of C@Si/GN/CNT/PDA-C is attributed to the stable hierarchical structure.

Original languageEnglish
Article number139708
JournalElectrochimica Acta
Volume404
Early online date5 Dec 2021
DOIs
Publication statusPublished - 1 Feb 2022

Keywords

  • Anode material
  • GN/CNT
  • Lithium ion battery
  • Poly-dopamine
  • Silicon

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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