Li_xV₂O₅ nanobelts for high capacity lithium-ion battery cathodes

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• 作者：Dmitrii A. Semenenko ; Daniil M. Itkis ; Ekaterina A. Pomerantseva ; Eugene A. Goodilin ; Tatiana L. Kulova ; Alex ; er M. Skundin ; Yurii D. Tretyakov
• 关键词：Vanadium oxide ; Hydrothermal ; Nanomaterials ; Lithium batteries
• 刊名：Electrochemistry Communications
• 出版年：2010
• 出版时间：September 2010
• 年：2010
• 卷：12
• 期：9
• 页码：1154-1157
• 全文大小：881 K

文摘

5–10 μm long, typically 200–300 nm wide, and several nanometers thick Li_xV₂O₅ (×  0.8) nanobelts with the δ-type crystal structure were synthesized by a hydrothermal treatment of Li⁺-exchanged V₂O₅ gel. When dried at 200 °C under vacuum prior to electrochemical testing, the as-prepared nanobelts underwent the well-known δ → ε → γ-phase transition giving a mixture of ε and γ phases as a nanocomposite electrode material. Such a simple preparation procedure guarantees a yield of material with drastically enhanced initial discharge specific capacity of 490 mAh/g and great cyclability. The enhanced electrochemical performance is attributed to the complex of experimental procedures including post-synthesis treatment of the single-crystalline Li_xV₂O₅ nanobelts.