凯发

With the advent of flexible electronics, flexible electrochemical energy storage and conversion devices have attracted great attention as a promising power source in the emerging field of flexible and wearable electronic devices. [1] Graphene as 2D carbon materials, have high specific surface area, good chemical stability, high electrical and thermal conductivity, and excellent flexibility. Therefore, graphene-based materials can be used as free-standing and binder-free electrodes for flexible electrochemical energy storage and conversion devices. By using the graphene, several kinds flexible electrode were explored.[2-5] A flexible graphene/polyaniline paper was prepared by in situ anodic electropolymerization of polyaniline on a graphene membrane, and it shows a stable large electrochemical capacitance and excellent cyclibility; graphene-cellulose paper membranes were fabricated as freestanding and binder-free electrodes for flexible supercapacitors with good performance. We also developed template-directed chemical vapor deposition to synthesize a three-dimensional interconnected graphene framework. By coating active materials on the graphene framework, an anode and cathode were made to assemble a thin, lightweight and flexible lithium ion battery [6] and lithium sulfur battery. The battery has high rate capability and capacity, and can be repeatedly bent down to <5 mm without failure and degradation of its electrochemical performance.

Reference:

[1] G.M. Zhou, F. Li, H.-M. Cheng. Progress in flexible lithium batteries and future prospects. Energy & Environmental Science, 2014, 7(4), 1307–1338.

[2] N. Li, G.M. Zhou, R.P. Fang, F. Li, and H-M Cheng. TiO2/graphene sandwich paper as an anisotropic electrode for high rate lithium ion batteries, Nanoscale, 2013, 5(17), 7780-7784

[3] D. W. Wang, F. Li, J. P. Zhao, W. C. Ren, Z. G. Chen, J. Tan, Z. S. Wu, I. Gentle, G. Q. Lu, H. M. Cheng, Fabrication of graphene/polyaniline composite paper via in situ anodic electropolymerization for high-performance flexible electrode, ACS Nano,3 (7), 1745-1752,2009

[4] Z. Weng, Y. Su, D. W. Wang, F. Li, J. Du, H. M. Cheng, Graphene-cellulose paper flexible supercapacitors, Advanced Energy Materials 2011, 1 (5), 917-922

[5] G.M. Zhou, L-C. Yin, D-W. Wang, L. Li, S.F. Pei, I. R. Gentle, F. Li, and H-M. Cheng, Fibrous hybrid of graphene and sulfur nanocrystals for high performance lithium-sulfur batteries. ACS Nano, 2013, 7(6), 5367-5375

[6] N. Li, Z. P. Chen, W. R. Ren, F. Li, H.-M.Cheng, Flexible graphene-based lithium ion batteries with ultrafast charge and discharge rates. Proc. Natl. Acad. Sci. U.S.A., 2012,109(43, 17360-17365)