Catalytic hosts with strong adsorption strength for long shelf-life lithium-sulfur batteries under lean electrolyte  

作　　者：Siyuan Zhao Huayu Pei Quan Yang Kangli Liu Yuanyuan Huang Zhuo Wang Guosheng Shao Jinping Liu Junling Guo 

机构地区：[1]State Center for International Cooperation on Designer Low-carbon&Environmental Materials,School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China [2]Zhengzhou Materials Genome Institute,Xingyang 450100,China [3]School of Chemistry,Chemical Engineering and Life Science,State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Nano Research》2023年第1期427-438,共12页纳米研究（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.52102318 and 52172229);the Natural Science Foundation of Henan(No.202300410427);fellowship of China Postdoctoral Science Foundation(No.2021TQ0287);the Zhengzhou Materials Genome Institute.The author would like to thank Shiyanjia Lab(www.shiyanjia.com)for the DFT calculation.

摘　　要：Low electrolyte/sulfur ratio(E/S)is an important factor in increasing the energy density of lithium-sulfur batteries(LSBs).Recently,the E/S has been widely lowered using catalytic hosts that can suppress“shuttle effect”during cycling by relying on a limited adsorption area.However,the shelf-lives of these cathodes have not yet received attention.Herein,we show that the selfdischarge of sulfur cathodes based on frequently-used catalytic hosts is serious under low E/S because the“shuttle effect”during storage process caused by polysulfides(PSs)disproportionation cannot be suppressed using a limited adsorption area.We further prove that the adsorption strength toward PSs,which is unfortunately weak in commonly-used catalytic hosts,is critical for effectively hindering the disproportionation of the PSs.Subsequently,to verify this conclusion,we prepare a sulfur-doped titanium nitride(S-TiN)catalytic array host.As the adsorption strength and catalytic activity of TiN can be improved by S doping simultaneously,the constructed S/S-TiN cathodes under a low E/S(6.5μL·mg−1)exhibit better shelf-life and cycle-stability than those of S/TiN cathodes.Our work suggests that enhancing the adsorption strength of catalytic hosts,while maintaining their function to reduce E/S,is crucial for practical LSBs.

关 键 词：lithium-sulfur battery low electrolyte/sulfur ratio(E/S) SELF-DISCHARGE catalytic host adsorption strength 

分 类 号：O64[理学—物理化学]