Material synthesis and device configuration design for flexible supercapacitors

Huiqiao Li

 Huazhong University of Science and Technology (HUST)

Abstract: Supercapacitors (SCs) with advantages of high power density, fast charge/discharge capability, long cycle life and safety, have been widely applied in various electric/hybrid devices as power sources, energy recovery devices or power compensation devices. Flexible SCs have attracted extensive interest and research to fulfill the requirements of flexibility, light-weight and miniaturization aroused from portable and wearable electronics. Novel nano materials especially nano composite materials with high specific capacitance have been constantly developed. Flexible two-dimensional (2D) tandem SCs, micro and fiber SCs have been successfully developed and a great progress has been gained. Despite this, some critical problems remained in flexible SCs, such as low volumetric capacitance and energy density, fastidious device configuration, complex and costly fabrication process, and lack of quantitative analysis on dynamic deformation. To address these problems and enhance electrochemical and mechanical performances of flexible SCs, we have made continuously efforts on: (1) development of high performance electrode materials, such as V2O5/CNT multilayered composites, ultrafine VN nanosheets assembled self-standing film electrode, porous Ni3S2/CoNi2S4 3D-network structures, high porous biomass derived carbons, etc.; (2) design of novel device structures/configuration including parallel double-helix structured 1D fiber SCs, 2D sandwich-like tandem SCs, and 2D in-plane chip-type micro SCs; (3) new strategy for device fabrication processing, such as a patterned collector-material-integrated technology for in-plane SCs by selective electrochemical deposition, a top-down fabrication route for wire-type SCs by a facile mechanical slicing method.

Biography: Huiqiao Li received her B. S. degree in chemistry from Zhengzhou University in 2003, and then received her Ph.D. degree in physical chemistry from Fudan University in 2008. She worked for 4 years at Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Japan. Currently, she is a full professor in the School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST). She has got the “New Century Excellent Talents”, “Distinguished Professor of Chutian Scholar”, “Hundred-Talents Program of Hubei Province”. Her research interests include energy storage materials and electrochemical power sources such as lithium-ion batteries, sodium-ion batteries and supercapacitors. She has authored and co-authored over 80 refereed journal publications, 1 book chapter, and 9 patents. Her publications have been cited more than 3500 times (H-index is 25).