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Tin-based materials as negative electrodes for Li-ion batteries: Combinatorial approaches and mechanical methods

โœ Scribed by A. D. W. Todd; P. P. Ferguson; M. D. Fleischauer; J. R. Dahn


Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
947 KB
Volume
34
Category
Article
ISSN
0363-907X

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โœฆ Synopsis


Graphite has been used as the negative electrode in lithium-ion batteries for more than a decade. To attain higher energy density batteries, silicon and tin, which can alloy reversibly with lithium, have been considered as a replacement for graphite. However, the volume expansion of these metal elements upon lithiation can result in poor capacity retention. Alloying the active metal element with an inactive material can limit the overall volume expansion and improve cycle life. This paper presents a summary of tin-based materials as negative electrodes. After reviewing attempts to improve and understand the electrochemical behaviour of metallic tin and its oxides, the focus turns to alloys of tin with a transition metal (TM) and, optionally, carbon. To do so, a combinatorial sputtering technique was used to simultaneously prepare many different compositions of Sn-TM-based materials. The structural and electrochemical results of these samples are presented and they show that cobalt is the preferred TM to give optimal performance. Finally, a comparison of a Sn-Co-C negative electrode material prepared by a rapid quenching method (sputtering) with a material prepared by an economical milling method (mechanical attrition) is presented and discussed.


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layer (Brewer Science XHRIC-16) was spun on the sample at 4000 rpm for 30 s and oven prebaked at 175 C for 3 min. Photoresist (PR; Shipley 510A) was spun on the ARC at 4000 rpm and oven prebaked for 3 min at 95 C. IL with 355 nm third-harmonic YAG laser beam was used to produce periodic nanopatterns