Tsinghua Shenzhen International Graduate School, Tsinghua University
Dr. Wei Lv is a teneured associate professor at Tsinghua Shenzhen International Graduate School, Tsinghua University. He received his Ph.D. degree from Tianjin University in 2012. His research interests focus on electrochemical energy storage devices and related materials, such as the carbon-based hosts and the catalysts in Li-S batteries and the lithium metal anode. He is granted by the Excellent Young Scientists Fund of NSFC and the Guangdong Natural Science Funds for Distinguished Young Scholar, and identified as a Highly Cited Researcher by Clarivate Analytics (2020-2023)
Lithium-sulfur (Li-S) batteries, which have high theoretical energy density, are the promising next-generation batteries. However, their practical use is hindered by several problems, including the low electronic conductivity of sulfur, the dissolution and shuttling of dissolved lithium polysulfides (LiPSs) in the electrolyte and the dendrite growth of lithium metal anode, which lead to the low utilization of sulfur and the fast capacity decay. Carbon materials are indispensable as sulfur hosts in the cathode because of their abundant porosity and controllable surface chemical properties to prevent LiPS shuttling and improve sulfur utilization. The key issue is achieving high sulfur loading while maintaining high sulfur utilization. We propose assembling the graphene to prepare the carbon-based host with large pores to ensure high sulfur loading. In addition, to introduce the other two-dimensional materials, such as MXenes, with catalysis activity, high sulfur utilization is achieved at the same time.
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