Multidimensional Materials and Electrode Architectures for High-Rate Hybrid (Faradic+Capacitive) Energy Storage 

Yury Gogotsi

Drexel University & Jilin University 

Abstract: Electrical energy storage (EES) plays a vital role in daily life because of our dependence on numerous electronic devices that require mobility [1]. Moreover, with miniaturization of electronics, penetration of wireless devices into our homes and clothes, wide use of sensor networks and widely anticipated “internet of things”, there is a major effort to develop miniature, but powerful EES devices. There is also a need for large-scale and inexpensive EES for grid and transportation. While there are thousands of papers on batteries and supercapacitors, new concepts must be formulated that will lead to a new generation of sustainable, affordable and safe EES technologies that will approach the theoretical limits for electrochemical storage and deliver electrical energy rapidly and efficiently. This presentation will address the cutting edge of EES, showing approaches to overcome diffusion limitations, which make current batteries slow and short-lived, by using capacitive EES principles (surface redox and fast intercalation processes) [1]. Two-dimensional (2D) materials with a thickness of a few nanometers or less can be used as single sheets due to their unique properties or as building blocks, to assemble a variety of structures [2[. Nonplanar architectures and redox materials, such as 2D transition metal carbides and nitrides (MXenes [3]) designed to increase the volumetric energy density of an electrode and eliminate/minimize the use of separators and current collectors will be reviewed. Oxygen or OH terminated MXenes, such as Ti3C2Ox, have redox capable transition metals layers on the surface and offer a combination of high electronic conductivity with hydrophilicity, as well fast ionic transport, offering charge-discharge time down to 10 ms [4].  Future research directions will be outlined with the goal of defining a new generation of EES materials/devices whose energy storage characteristics represent true hybridization of batteries and electrochemical capacitors.

Biography: Professor Yury Gogotsi is recognized as one of the leaders in materials for electrochemical capacitors. He seminal work on carbon nanomaterials helped to better understand the mechanisms of capacitive energy storage. He introduced new materials to the field, such as carbon onions, and invented new technologies, such as electrochemical flow capacitor. Gogotsi's recent work has concentrated on development of a new family of two-dimensional carbides and nitrides of transition metals (MXenes), which he and his Drexel University colleagues discovered in 2011. He is the author of over 500 of refereed journal papers and co-inventor of more than 60 inventions with patents issued or filed. He has an H-index of 92/109 (Web of Science/Google Scholar) and was recognized as Highly Cited Researcher by Thomson-Reuters/Clarivate Analytics in 2014-2017. Dr. Gogotsi is Charles T. and Ruth M. Bach Professor, Distinguished University Professor and Director of the A.J. Drexel Nanomaterials Institute at Drexel University. He also holds an appointment as Distinguished Foreign Professor at Jilin University, China.
Gogotsi has received numerous awards for his work, including the European Carbon Association Award, S. Somiya Award from the International Union of Materials Research Societies, Nano Energy award from Elsevier, International Nanotechnology Prize (RUSNANOPrize), and R&D 100 Award from R&D Magazine (twice). He has been elected a Fellow of the American Association for Advancement of Science (AAAS), Materials Research Society, American Ceramic Society, the Electrochemical Society, Royal Society of Chemistry, NanoSMAT Society, as well as Academician of the World Academy of Ceramics.