Electrospinning Synthesis of Wire-Structured LiCoO2 for Electrode Materials of High-Power Li-Ion Batteries

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• 作者：Yoshifumi Mizuno ; Eiji Hosono ; Tatsuya Saito ; Masashi Okubo ; Daisuke Nishio-Hamane ; Katsuyoshi Oh-ishi ; Tetsuichi Kudo ; Haoshen Zhou
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：May 17, 2012
• 年：2012
• 卷：116
• 期：19
• 页码：10774-10780
• 全文大小：514K
• 年卷期：v.116,no.19(May 17, 2012)
• ISSN：1932-7455

文摘

An application of the Li-ion batteries to advanced transportation systems essentially requires the enhancement of the rate capability; thus, the fabrication of nanostructured cathode materials with the large surface area and short Li-ion diffusion length is particularly important. In this study, an electrospinning method was adopted for the synthesis of wire-structured LiCoO₂. The diameter of the as-spun fiber obtained from the precursor solution with multiwalled carbon nanotubes (vapor-grown carbon fiber, VGCF) was thinner than that of as-spun fiber obtained from the solution without VGCF. After the heat treatment, wire-structured LiCoO₂ was successfully obtained regardless of the existence of dispersed VGCF in the precursor solution, although the particle size of LiCoO₂ fabricated with VGCF was smaller than that of LiCoO₂ fabricated without VGCF. The charge/discharge and rate-capability experiments revealed that both resulting materials show the reversible Li-ion insertion/extraction reaction. However, due to the existence of a small irreversible capacity at the initial cycles, the interfacial resistance increases, resulting in the poor cyclability and lower charge/discharge rate capability, especially for nanowire LiCoO₂ fabricated with VGCF.