文献类型：期刊文献

英文题名：Engineering a TiNb2O7-Based Electrocatalyst on a Flexible Self-Supporting Sulfur Cathode for Promoting Li-S Battery Performance

作者：Zhou, Xi[1];Zeng, Peng[1];Yu, Hao[1];Guo, Changmeng[1];Miao, Changqing[2];Guo, Xiaowei[2];Chen, Manfang[1];Wang, Xianyou[1]

第一作者：Zhou, Xi

通讯作者：Chen, MF[1];Wang, XY[1]

机构：[1]Xiangtan Univ, Sch Chem,Natl Base Int Sci & Technol Cooperat, Natl Local Joint Engn Lab Key Mat New Energy Stor, Hunan Prov Key Lab Electrochem Energy Storage & C, Xiangtan 411105, Peoples R China;[2]Xinxiang Univ, Sch Chem & Mat Engn, Xinxiang 453003, Henan, Peoples R China

第一机构：Xiangtan Univ, Sch Chem,Natl Base Int Sci & Technol Cooperat, Natl Local Joint Engn Lab Key Mat New Energy Stor, Hunan Prov Key Lab Electrochem Energy Storage & C, Xiangtan 411105, Peoples R China

通讯机构：[1]corresponding author), Xiangtan Univ, Sch Chem,Natl Base Int Sci & Technol Cooperat, Natl Local Joint Engn Lab Key Mat New Energy Stor, Hunan Prov Key Lab Electrochem Energy Storage & C, Xiangtan 411105, Peoples R China.

年份：2022

卷号：14

期号：1

起止页码：1157-1168

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20220211454257);Scopus(收录号：2-s2.0-85122577373);WOS:【SCI-EXPANDED(收录号:WOS:000769152700103)】；

基金：This work was supported financially by Hunan Provincial Innovation Foundation for Postgraduate (No. XDCX2021B161), Key Project of Strategic New Industry of Hunan Province (No. 2019GK2032), and the National Key Research and Development Program of China (No. 2018YFB0104200).

语种：英文

外文关键词：TiNb2O7; self-supporting; double transition metal oxide; Li-S batteries; redox kinetics

摘要：Lithium-sulfur (Li-S) batteries are considered a prospective energy storage system because of their high theoretical specific capacity and high energy density, whereas Li-S batteries still face many serious challenges on the road to commercialization, including the shuttle effect of lithium polysulfides (LiPSs), their insulating nature, the volume change of the active materials during the charge-discharge process, and the tardy sulfur redox kinetics. In this work, double transition metal oxide TiNb2O7 (TNO) nanometer particles are tactfully deposited on the surface of an activated carbon cloth (ACC), activating the surface through a hydrothermal reaction and high-temperature calcination and finally forming the flexible self-supporting architecture as an effective catalyst for sulfur conversion reaction. It has been found that ACC@TNO possesses many catalytic activity sites, which can inhibit the shuttle effect of LiPSs and increase the Coulombic efficiency by boosting the redox reaction kinetics of LiPS transformation reaction. As a consequence, the ACC@TNO/S cathode exhibits an impressive electrochemical performance, including a high initial discharge capacity of 885 mAh g(-1) at a high rate of 1 C, a high discharge specific capacity of 825 mAh g(-1) after 200 cycles with a prominent capacity retention rate of 93%, and a small decay rate of 0.034% per cycle. Although TNO is extensively used in the fields of lithium ion batteries and other rechargeable batteries, it is first introduced as sulfur host materials to boost the redox reaction kinetics of the LiPS transformation reaction and increase the electrochemical performance of Li-S batteries. Therefore, studies of the synergistic effect on the chemical absorption and catalytic conversion effect of TNO for LiPSs of Li-S batteries provide a good strategy for boosting further the comprehensive electrochemical performances of Li-S batteries.