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

Energies

Taegyune Yoon²  Jaegyeong Kim²  Jinku Kim¹ 

[1] Department of Bio and Chemical Engineering, Hongik University, Sejong 339-701, Korea; E-Mail:;Department of Chemical Engineering, Dong-A University, Busan 604-714, Korea; E-Mails:

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

DOI  :  10.3390/en6094830

来源: mdpi

【 摘 要 】

Magnetite, Fe₃O₄, 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 μm 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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.