title: Supercritical carbon dioxide anchored Fe₃O₄ nanoparticles on graphene foam and lithium battery performance.
abstract: Magnetite (Fe3O4) is an attractive electrode material due to its high theoretical capacity, eco-friendliness, and natural abundance. However, its commercial application in lithium-ion batteries is still hindered by its poor cycling stability and low rate capacity resulting from large volume expansion and low conductivity. We present a new approach which makes use of supercritical carbon dioxide to efficiently anchor Fe3O4 nanoparticles (NPs) on graphene foam (GF), which was obtained by chemical vapor deposition in a single step. Without the use of any surfactants, we obtain moderately spaced Fe3O4 NPs arrays on the surface of GF. The particle size of the Fe3O4 NPs exhibits a narrow distribution (11 ± 4 nm in diameter). As a result, the composites deliver a high capacity of about 1200 mAh g(-1) up to 500 cycles at 1 C (924 mAh g(-1)) and about 300 mAh g(-1) at 20 C, which reaches a record high using Fe3O4 as anode material for lithium-ion batteries.
authors.affiliation: College of Chemistry and Molecular Science, Wuhan University , Wuhan 430072, People's Republic of China.
authors.forename: Xuebo
authors.initials: X
authors.lastname: Hu
authors.forename: Minhao
authors.initials: M
authors.lastname: Ma
authors.forename: Mengqi
authors.initials: M
authors.lastname: Zeng
authors.forename: Yangyong
authors.initials: Y
authors.lastname: Sun
authors.forename: Linfeng
authors.initials: L
authors.lastname: Chen
authors.forename: Yinghui
authors.initials: Y
authors.lastname: Xue
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.forename: Xinping
authors.initials: X
authors.lastname: Ai
authors.forename: Rafael G
authors.initials: RG
authors.lastname: Mendes
authors.forename: Mark H
authors.initials: MH
authors.lastname: Rümmeli
authors.forename: Lei
authors.initials: L
authors.lastname: Fu
keywords: Fe3O4 nanoparticles; graphene foam; lithium-ion battery; supercritical CO2