Silicon Composite Electrodes with Dynamic Ionic Bonding

Sen Kang, Ke Yang, Scott R. White, Nancy R. Sottos

Research output: Contribution to journalArticle

Abstract

Silicon (Si) composite electrodes are developed with increased cycle lifetimes and reliability through dynamic ionic bonding between active Si nanoparticles and a polymer binder. Amine groups are covalently attached to Si nanoparticles via surface functionalization. Si composite electrodes are fabricated by combining the Si nanoparticles with a poly(acrylic acid) (PAA) binder. The formation of ionic bonds between amine groups on Si particles and carboxylic acid groups on the PAA binder is characterized by X-ray photoelectron spectroscopy and Raman spectroscopy. Si composite anodes with ionic bonding demonstrate long term cycling stability with capacity retention of 80% at 400 cycles at a current density of 2.1 A g−1 and good rate capability. The dynamic ionic bonds effectively mitigate the deterioration of electrical interfaces in the composite anodes as suggested by stable impedance over 300 cycles.

Original languageEnglish (US)
JournalAdvanced Energy Materials
Volume7
Issue number17
DOIs
StatePublished - Sep 6 2017

Keywords

  • Li-ion batteries
  • Si composite anodes
  • ionic bonding
  • restoration of electrical interfaces

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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