High Performance Lithium Sulfur Battery and in-situ Analysis Techniques
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.