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Utilization of Cu6Sn5 nanoparticles as anodes in sodium-ion batteries.

Cu6Sn5 nanoparticles are being studied as an anode material for sodium-ion batteries. Sodium electrochemically alloys with tin, with an optimal composition of [Na.sub.3.75]Sn (theoretical capacity: 516 mAh [g.sup.-1]). Copper is electrochemically inactive in sodium systems and instead acts as a buffer shell to surround the NaSn alloy for better electrical conductivity. In order to test the electrochemical performance of the copper-tin alloy, two processing techniques were used to fabricate the electrodes. The first technique utilizes vacuum filtration to create a free standing, flexible, binder free electrode by encasing the nanoparticles in a conductive multi-walled carbon nanotube (MWCNT) network. The second technique creates a laminated electrode cast on an aluminum current collector, combined with an electronically conductive carbon additive and a binding agent These electrodes were tested using Na half cells, utilizing pure sodium metal as the counter electrode. Initial testing using the first technique shows promising initial capacity of approximately 120 mAh [g.sup.-1], but rapidly declines to below 60 mAh [g.sup.-1] within 100 cycles. Studies on various additives, binders, and electrolytes are currently underway to improve the performance of the cells.

Riley Parrish, Boise State University

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Title Annotation:56TH ANNUAL SYMPOSIUM OF THE IDAHO ACADEMY OF SCIENCE: THEME: ENERGY, MATERIALS, AND NANOTECHNOLOGY
Author:Parrish, Riley
Publication:Journal of the Idaho Academy of Science
Article Type:Brief article
Geographic Code:1USA
Date:Dec 1, 2014
Words:196
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