Novel strategy to improve the Li-storage performance of micro silicon anodes

Min Jae Choi, Ying Xiao, Jang Yeon Hwang, Ilias Belharouak, Yang Kook Sun

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Silicon (Si)-based materials have attracted significant research as an outstanding candidate for the anode material of lithium-ion batteries. However, the tremendous volume change and poor electron conductivity of bulk silicon result in inferior capacity retention and low Coulombic efficiency. Designing special Si with high energy density and good stability in a bulk electrode remains a significant challenge. In this work, we introduce an ingenious strategy to modify micro silicon by designing a porous structure, constructing nanoparticle blocks, and introducing carbon nanotubes as wedges. A disproportion reaction, coupled with a chemical etching process and a ball-milling reaction, are applied to generate the desired material. The as-prepared micro silicon material features porosity, small primary particles, and effective CNT-wedging, which combine to endow the resultant anode with a high reversible specific capacity of up to 2028.6 mAh g−1 after 100 cycles and excellent rate capability. The superior electrochemical performance is attributed to the unique architecture and optimized composition.

Original languageEnglish
Pages (from-to)302-310
Number of pages9
JournalJournal of Power Sources
Volume348
DOIs
Publication statusPublished - 30 Apr 2017

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Keywords

  • High capacity
  • High tap density
  • Lithium-ion batteries
  • Micro Si
  • Nanoscale primary particles

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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