Si7Ti4Ni4 as a buffer material for Si and its electrochemical study for lithium ion batteries

Kyung Jae Lee, Seung Ho Yu, Jung Joon Kim, Dae Hyeok Lee, Jungjin Park, Soon Sung Suh, Jong Soo Cho, Yung Eun Sung

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Nano-Si embedded Si7Ti4Ni4 is synthesized with the melt spinning method, which is facile, and applicable to mass-production. Si7Ti4Ni4, the buffer material, is electrochemically inactive toward lithium. Nevertheless, Si 7Ti4Ni4 has good electrical conductivity, in the order of 105 S m-1, which is more conductive than amorphous carbon that is usually used as a coating material for active material. Furthermore, the surrounding grain boundaries of Si7Ti 4Ni4 effectively relax volume expansion of Si. Therefore, it plays a critical role in maintaining the structure of electrode and the integrity of active materials. As a result, nano-Si embedded in Si 7Ti4Ni4 shows outstanding cycle performance over 50 cycles at 400 mA g-1, and it maintains 86% of its specific capacity at 3200 mA g-1, compared with that of 400 mA g-1. This indicates that nano-Si embedded in Si7Ti4Ni 4 can be a promising anode material for lithium ion batteries.

Original languageEnglish
Pages (from-to)729-735
Number of pages7
JournalJournal of Power Sources
Volume246
DOIs
Publication statusPublished - 2014 Jan 1
Externally publishedYes

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Keywords

  • Buffer material
  • Lithium ion battery
  • Silicon
  • Volume expansion

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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