Electrochemical characteristics of Co-Si alloy and multilayer films as anodes for lithium ion microbatteries

초록

The cycling behaviors of Co-Si alloy and multilayered films, which were prepared by co-deposition from separate pure metal sources and by alternating deposition of different metals, respectively, are investigated. The alloy films with near stoichiometric compound composition of CoSi<inf>2.06</inf> and CoSi<inf>2.2</inf> exhibit an excellent cycling stability, but alloying with large excess Si results in capacity fading during cycling. The cycling stability of multilayers with average composition of CoSi<inf>2.9</inf> is improved significantly by post-annealing treatment at 350 °C. Nano-structured multilayer films are suggested as promising anode materials for thin-film batteries. © 2003 Elsevier Science Ltd. All rights reserved.

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