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An electrospun hierarchical LiV₃O₈ nanowire-in-network for high-rate and long-life lithium batteries

Ren, Wenhao, Zheng, Zhiping, Luo, Yanzhu, Chen, Wei, Niu, Chaojiang, Zhao, Kangning, Yan, Mengyu, Zhang, Lei, Meng, Jiashen, Mai, Liqiang
Journal of materials chemistry A 2015 v.3 no.39 pp. 19850-19856
cathodes, crosslinking, electrochemistry, lithium batteries, polyethylene glycol, polyvinyl alcohol, thermogravimetry
Structural and morphological control of the LiV₃O₈ material has a significant impact on its electrochemical performance. In order to obtain a favorable structure, a hierarchical LiV₃O₈ nanowire-in-network is designed and constructed by electrospinning through a polymer crosslinking strategy. The crosslinking effect between poly(vinyl alcohol) (PVA) and poly(ethylene oxide) (PEO) not only benefits electrospinning, but also realizes a mild multi-step degradation process during calcination. Based on temperature-dependent experiments and thermogravimetric (TG) analysis, the function of polymer blends and the formation mechanism of the structure are discussed in detail. As a cathode for lithium batteries, LiV₃O₈ exhibits a high initial capacity of 320.6 mA h g⁻¹ at 100 mA g⁻¹ and a high-rate capacity of 202.8 mA h g⁻¹ at 2000 mA g⁻¹. This remarkable performance is attributed to its unique structure, which provides a large effective contact area, low charge transfer resistance, and improved structural stability. Our work indicates that the hierarchical LiV₃O₈ nanowire-in-network material is a promising cathode for use in high-rate and long-life rechargeable lithium batteries.