TiO₂/Si composites synthesized by sol-gel method and their improved electrode performance as Li-ion battery anodes

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• 作者：Hiroyuki Usui ; Kuniaki Wasada ; Masahiro Shimizu ; Hiroki Sakaguchi
• 关键词：TiO2/Si composite ; Li-ion battery anode ; Sol&ndash ; gel method ; Gas-deposition ; Li-ion diffusion
• 刊名：Electrochimica Acta
• 出版年：30 November, 2013
• 年：2013
• 卷：111
• 期：Complete
• 页码：575-580
• 全文大小：2323 K

文摘

Composites of rutile-type TiO₂ and Si were synthesized by a facile sol-gel method for a high-performance anode of Li-ion battery. We have investigated anode performance of binder-free thick-film electrodes prepared by a gas-deposition method using the TiO₂/Si composites obtained. The composite electrode exhibited a remarkably improved cyclability and a good high-rate performance: a discharge capacity at the 900th cycle was 710 mAh g^鈭?, and a specific capacity per Si weight was as large as 1870 mAh g(Si)^鈭? even at a high current rate of 4.8 C. It is suggested that a fast Li-ion diffusion in TiO₂ provides smooth insertion/extraction of Li-ion into/from the composite electrodes. The results offer a utility of rutile TiO₂ as a Li-ion conductor in Si-based electrodes for the next-generation Li-ion battery.