Electrospun Li₄Ti₅O₁₂ nanofibers sheathed with conductive TiN/TiO_xN_y layer as?an?anode material for high power Li-ion batteries

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• 作者：Hyunjung Park ; Taeseup Song ; Hyungkyu Han ; Ungyu Paik
• 关键词：Lithium ion batteries ; Anode ; Lithium titanate ; Electrospinning ; Nitridation
• 刊名：Journal of Power Sources
• 出版年：2013
• 出版时间：15 December, 2013
• 年：2013
• 卷：244
• 期：Complete
• 页码：726-730
• 全文大小：1363 K

文摘

Spinel lithium titanate (Li₄Ti₅O₁₂) has attracted great interest as an anode material for lithium ion batteries due to its safe operation, low cost, and zero-strain effect during Li insertion/extraction. However, the poor rate capability caused by low electronic conductivity limits its practical use. We synthesized surface functionalized one-dimensional (1D) Li₄Ti₅O₁₂ nanofibers using simple electro-spinning and subsequent nitridation process. Uniformly coated conducting TiN/TiO_xN_y layer on the surface of Li₄Ti₅O₁₂ nanofiber enables fast electron transport along its one dimensional geometry, which leads to significant improvement in rate capability. Nitridated Li₄Ti₅O₁₂ nanofibers electrode delivers about 1.35 times larger discharge capacity than that of pristine nanofibers electrode at a current density of 10?C.