Brannerite-Type Vanadium鈥揗olybdenum Oxide LiVMoO6 as a Promising Anode Material for Lithium-Ion Batteries with High Capacity and Rate Capability

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• 作者：Nan Chen ; Chunzhong Wang ; Fang Hu ; Xiaofei Bie ; Yingjin Wei ; Gang Chen ; Fei Du
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：July 29, 2015
• 年：2015
• 卷：7
• 期：29
• 页码：16117-16123
• 全文大小：520K
• ISSN：1944-8252

文摘

Brannerite-type vanadium鈥搈olybdenum 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鈥揹ischarge 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^鈥? at the current density of 100 mA g^鈥? and a superior rate capability with discharge capacity of ca. 584 and 285 mAh g^鈥? under the high current densities of 2 and 5 A g^鈥?, 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 V⁵⁺ change into V³⁺/V²⁺, suggesting intercalation/deintercalation processes, whereas Mo⁶⁺ 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.