title: One-Pot Synthesis of Pomegranate-Structured Fe3 O4 /Carbon Nanospheres-Doped Graphene Aerogel for High-Rate Lithium Ion Batteries.
abstract: A unique hierarchically nanostructured composite of iron oxide/carbon (Fe3O4/C) nanospheres-doped three-dimensional (3D) graphene aerogel has been fabricated by a one-pot hydrothermal strategy. In this novel nanostructured composite aerogel, uniform Fe3O4 nanocrystals (5-10 nm) are individually embedded in carbon nanospheres (ca. 50 nm) forming a pomegranate-like structure. The carbon matrix suppresses the aggregation of Fe3O4 nanocrystals, avoids direct exposure of the encapsulated Fe3O4 to the electrolyte, and buffers the volume expansion. Meanwhile, the interconnected 3D graphene aerogel further serves to reinforce the structure of the Fe3O4/C nanospheres and enhances the electrical conductivity of the overall electrode. Therefore, the carbon matrix and the interconnected graphene network entrap the Fe3O4 nanocrystals such that their electrochemical function is retained even after fracture. This novel hierarchical aerogel structure delivers a long-term stability of 634 mA h g(-1) over 1000 cycles at a high current density of 6 A g(-1) (7 C), and an excellent rate capability of 413 mA h g(-1) at 10 A g(-1) (11 C), thus exhibiting great potential as an anode composite structure for durable high-rate lithium-ion batteries.
authors.affiliation: State Key Laboratory of Material-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University (Former Name: Nanjing University of Technology), Nanjing, Jiangsu, 210009, P. R. China.|Jiangnan Graphene Research Institute, Changzhou, Jiangsu, 213149, P. R. China.
authors.forename: Dafang
authors.initials: D
authors.lastname: He
authors.affiliation: State Key Laboratory of Material-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University (Former Name: Nanjing University of Technology), Nanjing, Jiangsu, 210009, P. R. China.
authors.forename: Lixian
authors.initials: L
authors.lastname: Li
authors.affiliation: Jiangnan Graphene Research Institute, Changzhou, Jiangsu, 213149, P. R. China.
authors.forename: Fengjuan
authors.initials: F
authors.lastname: Bai
authors.affiliation: State Key Laboratory of Material-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University (Former Name: Nanjing University of Technology), Nanjing, Jiangsu, 210009, P. R. China.
authors.forename: Chenyang
authors.initials: C
authors.lastname: Zha
authors.affiliation: State Key Laboratory of Material-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University (Former Name: Nanjing University of Technology), Nanjing, Jiangsu, 210009, P. R. China. lshen@njtech.edu.cn.
authors.forename: Liming
authors.initials: L
authors.lastname: Shen
authors.affiliation: Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois, 60208, USA.
authors.forename: Harold H
authors.initials: HH
authors.lastname: Kung
authors.affiliation: State Key Laboratory of Material-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University (Former Name: Nanjing University of Technology), Nanjing, Jiangsu, 210009, P. R. China. nzhbao@njtech.edu.cn.
authors.forename: Ningzhong
authors.initials: N
authors.lastname: Bao
keywords: carbon nanospheres; graphene; lithium ion batteries; magnetite nanocrystals; nanostructures