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Ulvestad, Asbjørn; Andersen, Hanne F; Jensen, Ingvild J T; Mongstad, Trygve T; Mæhlen, Jan Petter; Prytz, Øystein; Kirkengen, Martin
Scientific reports, 06/2018, Volume: 8, Issue: 1Journal Article
Silicon is often regarded as a likely candidate to replace graphite as the main active anode material in next-generation lithium ion batteries; however, a number of problems impacting its cycle stability have limited its commercial relevance. One approach to solving these issues involves the use of convertible silicon sub-oxides. In this work we have investigated amorphous silicon sub-nitride as an alternative convertible silicon compound by comparing the electrochemical performance of a-SiN thin films with compositions ranging from pure Si to SiN . We have found that increasing the nitrogen content gradually reduces the reversible capacity of the material, but also drastically increases its cycling stability, e.g. 40 nm a-SiN thin films exhibited a stable capacity of more than 1,500 mAh/g for 2,000 cycles. Consequently, by controlling the nitrogen content, this material has the exceptional ability to be tuned to satisfy a large range of different requirements for capacity and stability.
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