Si-TiN alloy anode materials prepared by reactive N2 gas milling: thermal stability and electrochemistry in Li-cells

Si-TiN alloys were synthesized through a novel N2 gas milling method and a conventional inert gas milling approach. Thermal stability of these two kinds of Si-TiN alloys and their electrochemistry as negative electrodes in Li-ion cells were evaluated before and after heating. Si70(TiN)30 prepared by...

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Bibliographic Details
Published in:Electrochimica acta 2021-11, Vol.396, p.139259, Article 139259
Main Authors: Cao, Simeng, Tahmasebi, Mohammad H., Bennett, J. Craig, Obrovac, M.N.
Format: Article
Language:English
Subjects:
Alloys
Anodes
Crystallization
Electric cells
Electrochemistry
Electrode materials
Grain structure
Heat treatment
High temperature
Li-ion batteries
Lithium-ion batteries
Rare gases
Si-alloy anodes
Silicon
Thermal stability
Titanium nitride
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Summary:Si-TiN alloys were synthesized through a novel N2 gas milling method and a conventional inert gas milling approach. Thermal stability of these two kinds of Si-TiN alloys and their electrochemistry as negative electrodes in Li-ion cells were evaluated before and after heating. Si70(TiN)30 prepared by N2 gas milling was found to have high temperature tolerance, evidenced by low crystallization and fine grain structure after heat treatment. The Si70(TiN)30 (N2) alloy after heat treatment shows resistance to Li15Si4 formation during electrochemical lithium insertion, which is presumably due to its fine grain structure. Si70(TiN)30 (N2) was further modified by carbon coating at 800°C, resulting in a high capacity retention after 50 cycles of 94%, while achieving a large reversible volumetric capacity of 1490 Ah/L.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2021.139259