Title：Design of High Energy Density Lithium-Sulfur Batteries

Speaker：Zhou Guangmin, Associate professor, Tsinghua -Berkeley Shenzhen Institute

Time：2020.11.18  10:00-11:00 a.m.

Venue：Conference Room 102, Building B5, University Town Campus, South China University of Technology 

Welcome faculties and students to attend! 

Biography：

Zhou Guangmin, associate professor and doctoral supervisor of Tsinghua-Berkeley Shenzhen University, graduated from Institute of Metal Research, Chinese Academy of Sciences in 2014, under the supervision of Academician Cheng Huiming and Researcher Li Feng. From 2014 to 2015, he carried out his postdoctoral research in the research group of Professor Arumugam Manthiram in UT Austin, USA. From 2015 to 2019, he worked as a postdoctoral researcher in Professor Cui Yi's research group at Stanford University. He has published more than 120 papers on electrochemical energy storage materials and devices in journals of Chemical Reviews, Nature Nanotechnology (2), Nature Communications (3), Science Advances, PNAS (2), Advanced Materials (5) and so on. The papers have been cited for more than 22,000 times (data from Google Scholar) with an H -index is 60. He was honored by Clarivate Analytics for being one of the most Global Highly Cited Researchers in 2018 and 2019.

Abstract

Despite the great promise of Li–S batteries, many challenges need to be addressed before they can find practical applications. For example, the low electrical conductivities of sulfur, polysulfide products and the final Li2S product affect the utilization of the active sulfur material and the rate capability of the battery. The highly soluble polysulfides in the electrolyte, which can shuttle between the anode and cathode and form a deposit of solid Li2S2/Li2S on the cathode and anode, cause an irreversible loss of sulfur, which leads to low Coulombic efficiency, low cyclic capacity and an increase in impedance. In this talk, firstly I will briefly introduce the background of rechargeable Li-S batteries, then I will talk about strategies to improve the performance of Li-S batteries from physical confinement, chemical binding and battery configuration design. Catalyzing capability of metal sulfides in promoting the conversion of sulfur species, reactivation of dead sulfur species and high energy LixSi/graphene–sulfur full cell will also be included. Finally, I will give a summary and acknowledgements.