title: Carbon-Coated Fe3O4/VOxHollow Microboxes Derived from Metal-Organic Frameworks as a High-Performance Anode Material for Lithium-Ion Batteries.
abstract: As the ever-growing demand for high-performance power sources, lithium-ion batteries with high storage capacities and outstanding rate performance have been widely considered as a promising storage device. In this work, starting with metal-organic frameworks, we have developed a facile approach to the synthesis of hybrid Fe3O4/VOxhollow microboxes via the process of hydrolysis and ion exchange and subsequent calcination. In the constructed architecture, the hollow structure provides an efficient lithium ion diffusion pathway and extra space to accommodate the volume expansion during the insertion and extraction of Li+. With the assistance of carbon coating, the obtained Fe3O4/VOx@C microboxes exhibit excellent cyclability and enhanced rate performance when employed as an anode material for lithium-ion batteries. As a result, the obtained Fe3O4/VOx@C delivers a high Coulombic efficiency (near 100%) and outstanding reversible specific capacity of 742 mAh g-1after 400 cycles at a current density of 0.5 A g-1. Moreover, a remarkable reversible capacity of 556 mAh g-1could be retained even at a current density of 2 A g-1. This study provides a fundamental understanding for the rational design of other composite oxides as high-performance electrode materials for lithium-ion batteries.
authors.affiliation: Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei, 230026, China.
authors.forename: Zhi-Wei
authors.initials: ZW
authors.lastname: Zhao
authors.affiliation: Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei, 230026, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Wen
authors.affiliation: Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei, 230026, China.
authors.forename: Kuang
authors.initials: K
authors.lastname: Liang
authors.affiliation: Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei, 230026, China.
authors.forename: Yi-Fan
authors.initials: YF
authors.lastname: Jiang
authors.affiliation: Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei, 230026, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Zhou
authors.affiliation: Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei, 230026, China.
authors.forename: Cong-Cong
authors.initials: CC
authors.lastname: Shen
authors.affiliation: Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China , Hefei, 230026, China.
authors.forename: An-Wu
authors.identifier: http://orcid.org/0000-0002-4950-0490
authors.initials: AW
authors.lastname: Xu
keywords: Fe3O4/VOx; carbon layers; hollow microboxes; lithium-ion batteries; nanohybrid