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Si-TiN alloy Li-ion battery negative electrode materials made by N2 gas milling

Published online by Cambridge University Press:  28 August 2018

Y. Wang ,
Simeng Cao ,
Hui Liu ,
Min Zhu  and
M.N. Obrovac Open the ORCID record for M.N. Obrovac [Opens in a new window]
Y. Wang
Affiliation:
Department of Chemistry, Dalhousie University, Halifax, N.S. B3H 4R2Canada School of Materials Science and Engineering and Key Laboratory of Advanced Energy, Storage Materials of Guangdong Province, South China University of Technology, Guangzhou 510641, P. R. China
Simeng Cao
Affiliation:
Department of Chemistry, Dalhousie University, Halifax, N.S. B3H 4R2Canada
Hui Liu
Affiliation:
Department of Chemistry, Dalhousie University, Halifax, N.S. B3H 4R2Canada School of Materials Science and Engineering and Key Laboratory of Advanced Energy, Storage Materials of Guangdong Province, South China University of Technology, Guangzhou 510641, P. R. China
Min Zhu
Affiliation:
School of Materials Science and Engineering and Key Laboratory of Advanced Energy, Storage Materials of Guangdong Province, South China University of Technology, Guangzhou 510641, P. R. China
M.N. Obrovac*
Affiliation:
Department of Chemistry, Dalhousie University, Halifax, N.S. B3H 4R2Canada Department of Physics and Atmospheric Science, Dalhousie University, Halifax, N.S. B3H 4R2Canada
*
Address all correspondence to M.N. Obrovac at mnobrovac@dal.ca
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Abstract

Si-TiN alloys are attractive for use as negative electrodes in Li-ion cells because of the high conductivity, low electrolyte reactivity, and thermal stability of TiN. Here it is shown that Si-TiN alloys with high Si content can surprisingly be made by simply ball milling Si and Ti powders in N2(g); a reaction not predicted by thermodynamics. This offers a low-cost and simple method of synthesizing these attractive materials. The resulting alloys have smaller grain sizes than Si-TiN made by ball milling Si and TiN directly, giving them high thermal stability and improved cycling characteristics in Li cells.

Type
Research Letters
Information
MRS Communications , Volume 8 , Issue 3 , September 2018 , pp. 1352 - 1357
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Copyright
Copyright © Materials Research Society 2018 

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