Fabrication of LiF/Fe/Graphene Nanocomposites As Cathode Material for Lithium-Ion Batteries

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• 作者：Ruguang Ma ; Yucheng Dong ; Liujiang Xi ; Shiliu Yang ; Zhouguang Lu ; Chiyuen Chung
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：February 13, 2013
• 年：2013
• 卷：5
• 期：3
• 页码：892-897
• 全文大小：479K
• 年卷期：v.5,no.3(February 13, 2013)
• ISSN：1944-8252

文摘

Homogeneous LiF/Fe/Graphene nanocomposites as cathode material for lithium ion batteries have been synthesized for the first time by a facile two-step strategy, which not only avoids the use of highly corrosive reagents and expensive precursors but also fully takes advantage of the excellent electronic conductivity of graphene. The capacity remains higher than 150 mA h g^鈥? after 180 cylces, indicating high reversible capacity and stable cyclability. The ex situ XRD and HRTEM investigations on the cycled LiF/Fe/G nanocomposites confirm the formation of FeF_x and the coexistence of LiF and FeF_x at the charged state. Therefore, the heterostructure nanocomposites of LiF/Fe/Graphene with nano-LiF and ultrafine Fe homogeneously anchored on graphene sheets could open up a novel avenue for the application of iron fluorides as high-performance cathode materials for lithium-ion batteries.

Keywords:

fluorides; graphene; nanocomposites; ball-milling; conversion reaction; lithium ion batteries