报告题目：Flexible EnergyStorage: Zinc Based Batteries
报告人：Chunyi Zhi
Department of Materials Science &Engineering,
City University of Hong Kong, Hong KongSAR, China
时间：2019年7月26日(星期五)下午14:30
地点：材料馆A323
Biography:
Dr. Chunyi Zhi got his PhD degree in physics from institute of physics,Chinese Academy of Sciences. After that, he started to work as a postdoctoralresearcher in National Institute for Materials Science (NIMS) in Japan,followed by a research fellow in International Center for Young Scientists inNIMS and a permanent position in NIMS as a senior researcher. He is currentlyan associate professor in Department of Materials Science & Engineering,City University of Hong Kong. Zhi’s research focuses flexible/wearable energy storage devices etc. He haspublished more than 240 papers with another-citation of>15000 and h-index of 68. He has been granted more than 70 patents.
Abstract:
Ourresearch focuses on development of flexible energy storage/conversion devices,including supercapacitors, batteries and metal air batteries. Wearableelectronic textiles that store capacitive energy are a next frontier inpersonalized electronics. We demonstrate a new electrolyte comprising polyacrylic acid dual cross-linked by hydrogen bonding andvinyl hybrid silica nanoparticles(VSNPs-PAA) that addresses all thesuperior functions and provide an ultimate solution to the intrinsicself-healability and high stretchability of a supercapacitor. Supercapacitorswith VSNPs-PAA as the electrolyte are self-healed, achieving an excellenthealing efficiency of ~100% even after 20 cycles of breaking/healing. By adesigned facile electrode fabrication procedure, they are stretched up to 600%strain with performance enhanced.
Inaddition, we have successfully fabricated an extremely safe, wearable andrechargeable solid-state aqueous electrolyte based battery with a newhierarchical polymer electrolyte (HPE). The HPE works as both an efficientionic conductor and a highly effective separator, providing high flexibility,high ionic conductivity as well as the excellent safety performance for thebattery. This solid state ZIB exhibits a high energy density (14.6 mWh cm−3normalized to the volume of the whole device), a high specific capacity of 280mAh g-1 and high capacity retention of 97% after 1000 cycles. Moreover, thisbattery exhibits high flexibility and greatly enhanced safety performance.
