title: Phase Separation Derived Core/Shell Structured Cu11V6O26/V2O5Microspheres: First Synthesis and Excellent Lithium-Ion Anode Performance with Outstanding Capacity Self-Restoration.
abstract: Novel amorphous vanadium oxide coated copper vanadium oxide (Cu11V6O26/V2O5) microspheres with 3D hierarchical architecture have been successfully prepared via a microwave-assisted solution method and subsequent annealing induced phase separation process. Pure Cu11V6O26microspheres without V2O5coating are also obtained by an H2O2solution dissolving treatment. When evaluated as an anode material for lithium-ion batteries (LIBs), the as-synthesized hybrid exhibits large reversible capacity, excellent rate capability, and outstanding capacity self-recovery. Under the condition of high current density of 1 A g-1, the 3D hierarchical Cu11V6O26/V2O5hybrid maintains a reversible capacity of ≈1110 mA h g-1. Combined electrochemical analysis and high-resolution transmission electron microscopy observation during cycling reveals that the amorphous V2O5coating plays an important role on enhancing the electrochemical performances and capacity self-recovery, which provides an active amorphous protective layer and abundant grain interfaces for efficient inserting and extracting of Li-ion. As a result, this new copper vanadium oxide hybrid is proposed as a promising anode material for LIBs.
authors.affiliation: MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: Jian
authors.initials: J
authors.lastname: Pei
authors.affiliation: MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.affiliation: MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: Changfeng
authors.initials: C
authors.lastname: Bie
authors.affiliation: MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
authors.forename: Jingxue
authors.initials: J
authors.lastname: Sun
keywords: Cu11V6O26/V2O5 hybrid; amorphous vanadium oxide coating; capacity self-restoration; lithium-ion batteries