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Energies 2013, 6(9), 4830-4840; doi:10.3390/en6094830

Article

Electrostatic Self-Assembly of Fe₃O₄ Nanoparticles on Graphene Oxides for High Capacity Lithium-Ion Battery Anodes

Taegyune Yoon ¹, Jaegyeong Kim ¹, Jinku Kim ² and Jung Kyoo Lee ^1,*

¹ Department of Chemical Engineering, Dong-A University, Busan 604-714, Korea ² Department of Bio and Chemical Engineering, Hongik University, Sejong 339-701, Korea

* Author to whom correspondence should be addressed.

Received: 19 July 2013; in revised form: 22 August 2013 / Accepted: 29 August 2013 / Published: 12 September 2013

(This article belongs to the Special Issue Li-ion Batteries and Energy Storage Devices)

Download PDF Full-Text [3811 KB, uploaded 12 September 2013 14:21 CEST]

Abstract: Magnetite, Fe₃O_4, is a promising anode material for lithium ion batteries due to its high theoretical capacity (924 mA h g⁻¹), high density, low cost and low toxicity. However, its application as high capacity anodes is still hampered by poor cycling performance. To stabilize the cycling performance of Fe₃O₄ nanoparticles, composites comprising Fe₃O₄ nanoparticles and graphene sheets (GS) were fabricated. The Fe₃O₄/GS composite disks of mm dimensions were prepared by electrostatic self-assembly between negatively charged graphene oxide (GO) sheets and positively charged Fe₃O₄-APTMS [Fe₃O₄ grafted with (3-aminopropyl)trimethoxysilane (APTMS)] in an acidic solution (pH = 2) followed by in situ chemical reduction. Thus prepared Fe₃O₄/GS composite showed an excellent rate capability as well as much enhanced cycling stability compared with Fe₃O₄ electrode. The superior electrochemical responses of Fe₃O₄/GS composite disks assure the advantages of: (1) electrostatic self-assembly between high storage-capacity materials with GO; and (2) incorporation of GS in the Fe₃O₄/GS composite for high capacity lithium-ion battery application.

Keywords: lithium-ion battery; anode; iron oxide; magnetite; graphene; self-assembly

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