High Performance Lithium Sulfur Battery and in-situ Analysis Techniques

Chenglin Yan

Soochow Institute for Energy and Materials InnovationS, Soochow University

Abstract: Lithium-sulfur  batteries  are  regarded as one  of  the  most promising  secondary battery  system  at  present  due  to  their  high theoretical  specific  capacity and theoretical specific energy. However, widespread practical applications for rechargeable lithium-sulfur batteries are plagued with many problems, such as low utilization rate, poor cycle life and rate performance, poor safety. To solve the  above  problems,  conductivity  of elemental sulfur  should  be  improved  and  shuttle  effect  should  be  inhibited. In this talk, we proposed a new strategy to improve the performance of lithium sulfur battery by  the suppression  of  the  polysulfides  dissolution,  optimization  of  the  composite materials  with  high  conductivity,  modification  of  the  electrolyte. A long cycle life of 500 cycles could be achieved. In-situ XANES and UV/Vis spectroscopy by analysis of the electrolyte and in-operando XPS by investigation of electrodes confirmed that covalent bond can effectively reduce the production of long-chain polysulfide, which is confirmed by DFT calculations. The reported strategy could be an important advance towards the commercial application of lithium-sulfur batteries.

Biography: Chenglin Yan is a full professor at Soochow University and executive director of key laboratory of advanced carbon materials and wearable energy technology in Suzhou, China. He received his PhD from Dalian University of Technology in 2008. In 2011, he became a staff scientist and a group leader at the Institute for Integrative Nanoscience at the Leibniz Institute in Dresden. In 2013, the IFW-Dresden awarded Dr Chenglin Yan the IIN Research Prize 2013 for his group’s research work. He received the Thousand Young Talents Award from the Chinese Thousand Talents Program in 2014.