title: Brannerite-Type Vanadium-Molybdenum Oxide LiVMoO₆ as a Promising Anode Material for Lithium-Ion Batteries with High Capacity and Rate Capability.
abstract: Brannerite-type vanadium-molybdenum oxide LiVMoO6 is prepared by a facile liquid-phase method, and its electrochemical properties as anode of lithium-ion batteries are comprehensively studied by means of galvanostatic charge-discharge profiles, rate performance, and cyclic voltammetry. In the working voltage between 3.0 and 0.01 V, LiVMoO6 delivers a high reversible capacity of more than 900 mAh g(-1) at the current density of 100 mA g(-1) and a superior rate capability with discharge capacity of ca. 584 and 285 mAh g(-1) under the high current densities of 2 and 5 A g(-1), respectively. Moreover, ex situ X-ray diffraction and X-ray photoelectron spectroscopy are utilized to examine the phase evolution and valence changes during the first lithiated process. A small amount of inserted Li(+) induces a decomposition of LiVMoO6 into Li2Mo2O7 and V2O5, which play the host during further lithiated processes. When being discharged to 0.01 V, most V(5+) change into V(3+)/V(2+), suggesting intercalation/deintercalation processes, whereas Mo(6+) are reduced into a metallic state on the basis of the conversion reaction. The insights obtained from this study will benefit the design of novel anode materials for lithium-ion batteries.
authors.forename: Nan
authors.initials: N
authors.lastname: Chen
authors.forename: Chunzhong
authors.initials: C
authors.lastname: Wang
authors.affiliation: §School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, PR China.
authors.forename: Fang
authors.initials: F
authors.lastname: Hu
authors.affiliation: ∥Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Kyoto 615-8520, Japan.
authors.forename: Xiaofei
authors.initials: X
authors.lastname: Bie
authors.forename: Yingjin
authors.initials: Y
authors.lastname: Wei
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: Fei
authors.initials: F
authors.lastname: Du
keywords: anode materials; electrochemical properties; lithiated mechanism; lithium-ion batteries; vanadium−molybdenum oxide