文献类型：期刊文献

英文题名：Oxygen vacancies-enriched CeO2-CoxOy heterostructures facilitate the "trapping-conversion" process of lithium polysulfides for high-performance Li-S batteries

作者：Gao, Anran[1];Wu, Qinwen[1];Chen, Hongli[1];Pan, Yukun[1];Niu, Bo[1];Zhang, Yayun[1,2];Long, Donghui[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Specially Funct Mat & Related Technol, Minist Educ, Shanghai 200237, Peoples R China

年份：2025

卷号：512

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20251518215503);WOS:【SCI-EXPANDED(收录号:WOS:001483915000001)】；

基金：This work was partly supported by National Natural Science Foun-dation of China (No. U2341291 and No. 52102098) and Fundamental Research Funds for the Central Universities. Thanks, ceshihui ( www.ceshihui.cn) for the XRD analysis.

语种：英文

外文关键词：Oxygen vacancies; CeO 2-CoO/rGO heterostructure; Bidirectional catalytic process; Polysulfides conversion; Separator modified

摘要：Oxygen vacancies can tune the electronic and catalytic properties of oxide heterostructures, but their actions on the lithium polysulfides (LiPSs) conversion in Li-S batteries remain largely unexplored. Herein, we develop an oxygen vacancies-enriched CeO2-CoO heterostructure that could accelerate the sulfur redox kinetics via rapid bidirectional catalytic process. The enrichment of oxygen vacancies enhances electron interactions between CeO2-CoO and LiPSs by regulating the d-orbit electron density within the oxide heterostructure. This regulation significantly improves both adsorption capacity and catalytic activity of CeO2-CoO heterostructure, thereby resulting in an efficient and sustainable "trapping-conversion" process for LiPSs. Consequently, Li-S battery with the oxygen vacancies-enriched CeO2-CoO modified separator exhibits a notable lithium-ion diffusion coefficient (Dli+) of 3.1*10-5 cm2 s-1 in the sulfur oxidation process, and a high initial specific capacity of 1450 mAh g-1 at 0.2C and an ultra-low-capacity decay rate of 0.04 % per cycle over 1000 cycles at 1C. The present work highlights the positive actions of oxygen vacancies in heterostructures on the LiPSs conversion, offering a new pathway to improve the performance of Li-S batteries.