文献类型：期刊文献

英文题名：ZnS-SnS@NC Heterostructure as Robust Lithiophilicity and Sulfiphilicity Mediator toward High-Rate and Long-Life Lithium-Sulfur Batteries

作者：Yao, Weiqi[1];Zheng, Weizhong[2];Xu, Jie[3,4];Tian, Chengxiang[5];Han, Kun[6];Sun, Weizhen[2];Xiao, Shengxiong[1]

机构：[1]Shanghai Normal Univ, Coll Chem & Mat Sci, Key Lab Resource Chem, Shanghai Key Lab Rare Earth Funct Mat,Educ Minist, Shanghai 200234, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[3]Fudan Univ, iChEM Collaborat Innovat Ctr Chem Energy Mat, Inst New Energy, Dept Chem, Shanghai 200433, Peoples R China;[4]Fudan Univ, iChEM Collaborat Innovat Ctr Chem Energy Mat, Inst New Energy, Shanghai Key Lab Mol Catalysis & Innovat Mat, Shanghai 200433, Peoples R China;[5]Natl Univ Singapore, Dept Mech Engn, Singapore 117575, Singapore;[6]Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, Inst Adv Mat & Technol, Beijing 100083, Peoples R China

年份：2021

卷号：15

期号：4

起止页码：7114

外文期刊名：ACS NANO

收录：;EI(收录号：20211810297889);WOS:【SCI-EXPANDED(收录号:WOS:000645436800100)】；

基金：This research work was fully financially by the National Natural Science Foundation of China (21772123, 22008065), China Postdoctoral Science Foundation (2019TQ0204, 2020M671179), Shanghai Engineering Research Center of Green Energy Chemical Engineering (18DZ2254200), Shanghai Government (18JC1412900), and International Joint Laboratory of Resource Chemistry (IJLRC). The authors also acknowledge the Beijing Synchrotron Radiation Facility (BSRF) for the XAS measurement and Shiyanjia Lab (www.shiyanjia.com) for the TG characterizations.

语种：英文

外文关键词：Li-S batteries; heterostructure; ZnS-SnS; polysulfides; electrocatalysts

摘要：Lithium-sulfur ( Li-S) batteries are severely hindered by the low sulfur utilization and short cycling life, especially at high rates. One of the effective solutions to address these problems is to improve the sulfiphilicity of lithium polysulfides (LiPSs) and the lithiophilicity of the lithium anode. However, it is a great challenge to simultaneously optimize both aspects. Herein, by incorporating the merits of strong absorbability and high conductivity of SnS with good catalytic capability of ZnS, a ZnS-SnS heterojunction coated with a polydopamine-derived N-doped carbon shell (denoted as ZnS-SnS@NC) with uniform cubic morphology was obtained and compared with the ZnS-SnS2@NC heterostructure and its single-component counterparts (SnS@NC and SnS2@NC). Theoretical calculations, ex situ XANES, and in situ Raman spectrum were utilized to elucidate rapid anchoring-diffusion-transformation of LiPSs, inhibition of the shuttling effect, and improvement of the sulfur electrochemistry of bimetal ZnS-SnS heterostructure at the molecular level. When applied as a modification layer coated on the separator, the ZnS-SnS@NC-based cell with optimized lithiophilicity and sulfiphilicity enables desirable sulfur electrochemistry, including high reversibility of 1149 mAh g(-1) for 300 cycles at 0.2 C, high rate performance of 661 mAh g(-1) at 10 C, and long cycle life with a low fading rate of 0.0126% each cycle after 2000 cycles at 4 C. Furthermore, a favorable areal capacity of 8.27 mAh cm(-2) is maintained under high sulfur mass loading of 10.3 mg cm(-2). This work furnishes a feasible scheme to the rational design of bimetal sulfides heterostructures and boosts the development of other electrochemical applications.