Si 7 Ti 4 Ni 4 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

22 Citations (Scopus)

Abstract

Nano-Si embedded Si 7 Ti 4 Ni 4 is synthesized with the melt spinning method, which is facile, and applicable to mass-production. Si 7 Ti 4 Ni 4 , the buffer material, is electrochemically inactive toward lithium. Nevertheless, Si 7 Ti 4 Ni 4 has good electrical conductivity, in the order of 10 5 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 Si 7 Ti 4 Ni 4 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 7 Ti 4 Ni 4 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 Si 7 Ti 4 Ni 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

Fingerprint

electric batteries
Buffers
lithium
buffers
cycles
melt spinning
integrity
ions
anodes
grain boundaries
coatings
electrical resistivity
expansion
electrodes
carbon
Melt spinning
Amorphous carbon
Lithium
Anodes
Grain boundaries

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

Cite this

Si 7 Ti 4 Ni 4 as a buffer material for Si and its electrochemical study for lithium ion batteries . / Lee, Kyung Jae; Yu, Seung-Ho; Kim, Jung Joon; Lee, Dae Hyeok; Park, Jungjin; Suh, Soon Sung; Cho, Jong Soo; Sung, Yung Eun.

In: Journal of Power Sources, Vol. 246, 01.01.2014, p. 729-735.

Research output: Contribution to journalArticle

Lee, Kyung Jae ; Yu, Seung-Ho ; Kim, Jung Joon ; Lee, Dae Hyeok ; Park, Jungjin ; Suh, Soon Sung ; Cho, Jong Soo ; Sung, Yung Eun. / Si 7 Ti 4 Ni 4 as a buffer material for Si and its electrochemical study for lithium ion batteries In: Journal of Power Sources. 2014 ; Vol. 246. pp. 729-735.
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AU - Kim, Jung Joon

AU - Lee, Dae Hyeok

AU - Park, Jungjin

AU - Suh, Soon Sung

AU - Cho, Jong Soo

AU - Sung, Yung Eun

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N2 - Nano-Si embedded Si 7 Ti 4 Ni 4 is synthesized with the melt spinning method, which is facile, and applicable to mass-production. Si 7 Ti 4 Ni 4 , the buffer material, is electrochemically inactive toward lithium. Nevertheless, Si 7 Ti 4 Ni 4 has good electrical conductivity, in the order of 10 5 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 Si 7 Ti 4 Ni 4 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 7 Ti 4 Ni 4 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 Si 7 Ti 4 Ni 4 can be a promising anode material for lithium ion batteries.

AB - Nano-Si embedded Si 7 Ti 4 Ni 4 is synthesized with the melt spinning method, which is facile, and applicable to mass-production. Si 7 Ti 4 Ni 4 , the buffer material, is electrochemically inactive toward lithium. Nevertheless, Si 7 Ti 4 Ni 4 has good electrical conductivity, in the order of 10 5 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 Si 7 Ti 4 Ni 4 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 7 Ti 4 Ni 4 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 Si 7 Ti 4 Ni 4 can be a promising anode material for lithium ion batteries.

KW - Buffer material

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KW - Silicon

KW - Volume expansion

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