Nov. 11^th Mon. 2019, 12:00pm
N Center #86126, Sungkyunkwan University, Suwon

New Electrode Materials for the next generation of Energy Storage Devices

Prof. Dominique Guyomard

Institut des matériaux Jean Rouxel (IMN), Université de Nantes-CNRS, Nantes, France

Abstract

Recent developments in our Lab at the IMN will be shared on advanced electrode materials for the next-generation energy storage systems.

We review our recent discovery of a novel conducting polymer electrode achieving high capacity at 3.5V under long term cycling, and we show its beneficial use as a thin coating on LiFePO4 powder for Li-ion application.

Si-based Li-ion batteries will deliver higher energy density than their graphite counterpart, but they still suffer from low cycle life and poor comprehension of their reaction mechanism. We describe our recent results on the nanoscale STEM-EELS imaging of the silicon reaction mechanism upon cycling.

For stationary applications such as storage of renewable energy sources, low cost is a must. We focus on aqueous organic batteries as a new promising technology, barely studied yet, for which negative electrodes are missing. We have designed and synthesized novel mixed p- and n-type “bi-block” oligomer negative electrodes with repeating units made of naphthalene diimide and bipyridinium units. They demonstrate optimal potential, extremely fast kinetics and highly competitive capacity and cyclability in both neutral aqueous Na and Mg electrolytes, including ocean water. Based on these findings, full organic cells were assembled and tested.

Brief Bio

Dominique Guyomard has created the “Electrochemical Energy Storage and Transformation Lab” (EEST) at the IMN (Institut des Materiaux Jean Rouxel at Nantes, France) in 2007, about 40 scientists including 17 staff members. His team gathers activities on rechargeable batteries, on supercapacitors, on high temperature fuels cells and electrolysers, and on advanced spectroscopies.

His main purpose is to bridge the gap between academic research and industrial developments in the field of energy storage, with innovative and comprehensive research on industrial key issues. His expertise deals with solid state electrochemistry, material science and surface science, applied to the fields of Li-ion, Li metal polymer, and eco-friendly organic batteries, in collaboration with several industrial companies.

He received the 2007 IBA Research Award, the 2008 French Academy of Science Award for Science transfer to Industry, the 2010 ECS Battery Division Research Award, and the 2016 ECS Battery Division Technology Award. He is co-inventor of 34 patents and co-author of more than 360 articles including 265 peer-reviewed papers, and has delivered more than 100 invited international conferences.