1 Supporting Information Facile Fabrication of Foldable Electrospun Polyacrylonitrile-Based Carbon Nanofibers for Flexible Lithium-Ion Batteries Renzhong Chen, Yi Hu*, Zhen Shen, Peng Pan, Xia He, Keshi Wu, Xiangwu Zhang, and Zhongling Cheng *E-mail: huyi-v@zstu.edu.cn Fig. S1 XPS spectra of Zn(Ac) 2 nanoparticles, PAN nanofibers, and Zn(Ac) 2 /PAN nanofibers: a) survey spectrum and b) N 1s, c) O 1s, and d) Zn 2p spectra. The chemical bonding states of Zn(Ac) 2 /PAN nanofibers were investigated by XPS. The full wide-scan spectrum exhibits strong O and Zn signals from the Zn(Ac) 2 /PAN nanofibers, confirming the presence of Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A. This journal is © The Royal Society of Chemistry 2017