title: Fe3O4 nanoparticle-integrated graphene sheets for high-performance half and full lithium ion cells.
abstract: We synthesized Fe(3)O(4) nanoparticle/reduced graphene oxide (RGO-Fe(3)O(4)) nanocomposites and evaluated their performance as anodes in both half and full coin cells. The nanocomposites were synthesized through a chemical co-precipitation of Fe(2+) and Fe(3+) in the presence of graphene oxides within an alkaline solution and a subsequent high-temperature reduction reaction in argon (Ar) environment. The morphology and microstructures of the fabricated RGO-Fe(3)O(4) nanocomposites were characterized using various techniques. The results indicated that the Fe(3)O(4) nanoparticles had relatively homogeneous dispersions on the RGO sheet surfaces. These as-synthesized RGO-Fe(3)O(4) nanocomposites were used as anodes for both half and full lithium-ion cells. Electrochemical measurement results exhibit a high reversible capacity which is about two and a half times higher than that of graphite-based anodes at a 0.05C rate, and an enhanced reversible capacity of about 200 mAh g(-1) even at a high charge/discharge rate of 10C (9260 mA g(-1)) in half cells. Most important of all, these fabricated novel nanostructures also show exceptional capacity retention with the assembled RGO-Fe(3)O(4)/LiNi(1/3)Mn(1/3)Co(1/3)O(2) full cell at different C rates. This outstanding electrochemical behavior can be attributed to the unique microstructure, morphology, texture, surface properties of the nanocomposites, and combinative effects from the different chemical composition in the nanocomposites.
authors.affiliation: The Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA.
authors.forename: Liwen
authors.initials: L
authors.lastname: Ji
authors.forename: Zhongkui
authors.initials: Z
authors.lastname: Tan
authors.forename: Tevye R
authors.initials: TR
authors.lastname: Kuykendall
authors.forename: Shaul
authors.initials: S
authors.lastname: Aloni
authors.forename: Shidi
authors.initials: S
authors.lastname: Xun
authors.forename: Eric
authors.initials: E
authors.lastname: Lin
authors.forename: Vincent
authors.initials: V
authors.lastname: Battaglia
authors.forename: Yuegang
authors.initials: Y
authors.lastname: Zhang