Abstract
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.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
