Photocatalytic Synthesis of TiO2 and Reduced Graphene Oxide Nanocomposite for Lithium Ion Battery

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• 作者：Jingxia Qiu ; Peng Zhang ; Min Ling ; Sheng Li ; Porun Liu ; Huijun Zhao ; Shanqing Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：July 25, 2012
• 年：2012
• 卷：4
• 期：7
• 页码：3636-3642
• 全文大小：399K
• 年卷期：v.4,no.7(July 25, 2012)
• ISSN：1944-8252

文摘

In this work, we synthesized graphene oxide (GO) using the improved Hummers鈥?oxidation method. TiO₂ nanoparticles can be anchored on the GO sheets via the abundant oxygen-containing functional groups such as epoxy, hydroxyl, carbonyl, and carboxyl groups on the GO sheets. Using the TiO₂ photocatalyst, the GO was photocatalytically reduced under UV illumination, leading to the production of TiO₂-reduced graphene oxide (TiO₂-RGO) nanocomposite. The as-prepared TiO₂, TiO₂-GO, and TiO₂-RGO nanocomposite were used to fabricate lithium ion batteries (LIBs) as the active anode materials and their corresponding lithium ion insertion/extraction performance was evaluated. The resultant LIBs of the TiO₂-RGO nanocomposite possesses more stable cyclic performance, larger reversible capacity, and better rate capability, compared with that of the pure TiO₂ and TiO₂-GO samples. The electrochemical and materials characterization suggest that the graphene network provides efficient pathways for electron transfer, and the TiO₂ nanoparticles prevent the restacking of the graphene nanosheets, resulting in the improvement in both electric conductivity and specific capacity, respectively. This work suggests that the TiO₂ based photocatalytic method could be a simple, low-cost, and efficient approach for large-scale production of anode materials for lithium ion batteries.

Keywords:

lithium ion batteries; UV photocatalysis; TiO₂; reduced graphene oxide