Journal
NANO LETTERS
Volume 14, Issue 1, Pages 277-283Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl403943g
Keywords
Nanostructures; silicon; lithium-ion battery; flash heat treatment; rate capability; electrochemical performance
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- University of Waterloo
- Waterloo Institute for Nanotechnology
- Office of Vehicle Technologies of the U.S. Department of Energy [DE-AC02-05CH11231, 7056410]
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A novel, economical flash heat treatment of the fabricated silicon based electrodes is introduced to boost the performance and cycle capability of Li-ion batteries. The treatment reveals a high mass fraction of Si, improved interfacial contact, synergistic SiO2/C coating, and a conductive cellular network for improved conductivity, as well as flexibility for stress compensation. The enhanced electrodes achieve a first cycle efficiency of similar to 84% and a maximum charge capacity of 3525 mA h g(-1), almost 84% of silicon's theoretical maximum. Further, a stable reversible charge capacity of 1150 mA h g(-1) at 1.2 A g(-1) can be achieved over 500 cycles. Thus, the flash heat treatment method introduces a promising avenue for the production of industrially viable, next-generation Li-ion batteries.
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