title: Superstructure ZrV2O7nanofibres: thermal expansion, electronic and lithium storage properties.
abstract: ZrV2O7has attracted much attention as a negative thermal expansion (NTE) material due to its isotropic negative structure. However, rarely has investigation of the lithium storage behaviors been carried out except our first report on it. Meanwhile, the electrochemical behaviors and energy storage characteristics have not been studied in depth and will be explored in this article. Herein, we report on the synthesis, characterization and lithium intercalation mechanism of superstructure ZrV2O7nanofibres that were prepared through a facile solution-based method with a subsequent annealing process. The thermal in situ XRD technique combined with the Rietveld refinement method is adopted to analyze the change in the temperature-dependent crystal structure. Benefiting from the nanostructured morphology and relatively high electronic conductivity, it presents acceptable cyclic stability and rate capability. According to the operando evolution of the XRD patterns obtained from electrochemical in situ measurements, the Li intercalation mechanism of the solid solution process with a subsequent conversion reaction can be concluded. Finally, the amorphous state of the electrodes after the initial fully discharged state can effectively enhance the electrochemical performances.
authors.affiliation: School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, P. R. China.
authors.forename: Qidong
authors.initials: Q
authors.lastname: Li
authors.affiliation: School of Physics, South China University of Technology, Guangzhou, 510641, P. R. China. sckq@scut.edu.cn and State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510641, P. R. China.
authors.forename: Yanming
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: School of Physics, South China University of Technology, Guangzhou, 510641, P. R. China. sckq@scut.edu.cn.
authors.forename: Quan
authors.initials: Q
authors.lastname: Kuang
authors.affiliation: School of Physics, South China University of Technology, Guangzhou, 510641, P. R. China. sckq@scut.edu.cn.
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Fan
authors.affiliation: School of Physics, South China University of Technology, Guangzhou, 510641, P. R. China. sckq@scut.edu.cn.
authors.forename: Youzhong
authors.initials: Y
authors.lastname: Dong
authors.affiliation: School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, P. R. China.
authors.forename: Xudong
authors.initials: X
authors.lastname: Liu