Correlations among structure, composition and electrochemical performances of WO3 anode materials for lithium ion batteries. (20th February 2016)

• Record Type: Journal Article
• Authors: Li, Pu; Li, Xing; Zhao, Ziyan; Wang, Mingshan; Fox, Thomas; Zhang, Qian; Zhou, Ying
• Is Part Of: Electrochimica acta. Volume 192(2016)
• Page Start: 148
• Page End: 157
• Publication Date: 2016-02-20
• Subjects: lithium-ion batteries -- WO3 -- structure and composition -- electrochemical properties; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.01.199
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: The residual precursor ions affect the charge/discharge performances of WO3 . Lithiated monoclinic WO3 reveals the best discharge capacity. Lithiation can enhance the conductivity of WO3 . Abstract: Suitable host structure for lithium insertion and extraction is crucial for lithium-ion batteries. Tungsten trioxides (WO3 ) are particularly interesting materials for this purpose. In this work, the influences of structure and composition of WO3 on the charge/discharge performances of Li-ion batteries are systematically investigated. Firstly, lithiated tungsten trioxides (Li-WO3 ) are successfully synthesized by a hydrothermal method followed by annealing at different temperatures (200–600 °C). It is found that the hexagonal framework collapses and gradually transforms to the monoclinic phase due to the release of NH4 + and NH3 molecules. Unexpectedly, monoclinic WO3 reveals better performances than that of hexagonal WO3 . Among all the investigated samples, the lithiated WO3 annealed at 500 °C exhibits the highest discharge capacity and cycle performance (703 mAh g −1 after 10 cycles). We believe that the Li + remained in the solid structure of WO3 can lead to a more stable structure. In addition, Li + could inhibit the oxidation of W 5+ during the heat treatment process, which increases the electron conductivity of WO3 . Our results indicate that the electrochemical properties of WO3 are strongly related to the residual precursor and crystal structure.