文献类型：期刊文献

英文题名：P-Doped NiTe2 with Te-Vacancies in Lithium-Sulfur Batteries Prevents Shuttling and Promotes Polysulfide Conversion

作者：Yao, Weiqi[1];Tian, Chengxiang[2];Yang, Chao[3];Xu, Jie[1];Meng, Yufeng[4];Manke, Ingo[3];Chen, Nan[5];Wu, Ziling[1];Zhan, Liang[1];Wang, Yanli[1];Chen, Renjie[5]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Natl Univ Singapore, Dept Mech Engn, Singapore 117575, Singapore;[3]Helmholtz Ctr Berlin Mat & Energy, Hahn Meitner Pl 1, D-14109 Berlin, Germany;[4]Shanghai Inst Space Power Sources, Shanghai 200245, Peoples R China;[5]Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing 100081, Peoples R China

年份：2022

卷号：34

期号：11

外文期刊名：ADVANCED MATERIALS

收录：;EI(收录号：20220611602291);WOS:【SCI-EXPANDED(收录号:WOS:000750240100001)】；

基金：W.Y. and C.T. contributed equally to this work. This work was financed supported by the Natural Science Foundation of China (No. 22075081, 51472086, 51002051, U1710252, U21A2060) and Beijing Outstanding Young Scientists Program (BJJWZYJH01201910007023). The authors appreciate the assistance provided by the Analysis and Testing Center of East China University of Science and Technology. Additional support was provided by Feringa Nobel Prize Scientist Joint Research Center. The authors would gratefully acknowledge the beam time allocation at BESSY II (KMC-2 beamline) of Helmholtz-Zentrum Berlin for the XAS measurements. The authors also acknowledge the Shiyanjia Lab (www.shiyanjia.com).

语种：英文

外文关键词：electrocatalysts; lithium-sulfur batteries; modified separator; P-doping; Te-vacancy

摘要：Lithium-sulfur (Li-S) batteries have been hindered by the shuttle effect and sluggish polysulfide conversion kinetics. Here, a P-doped nickel tellurium electrocatalyst with Te-vacancies (P subset of NiTe2-x) anchored on maize-straw carbon (MSC) nanosheets, served as a functional layer (MSC/P subset of NiTe2-x) on the separator of high-performance Li-S batteries. The P subset of NiTe2-x electrocatalyst enhanced the intrinsic conductivity, strengthened the chemical affinity for polysulfides, and accelerated sulfur redox conversion. The MSC nanosheets enabled NiTe2 nanoparticle dispersion and Li+ diffusion. In situ Raman and ex situ X-ray absorption spectra confirmed that the MSC/P subset of NiTe2-x restrained the shuttle effect and accelerated the redox conversion. The MSC/P subset of NiTe2-x-based cell has a cyclability of 637 mAh g(-1) at 4 C over 1800 cycles with a degradation rate of 0.0139% per cycle, high rate performance of 726 mAh g(-1) at 6 C, and a high areal capacity of 8.47 mAh cm(-2) under a sulfur configuration of 10.2 mg cm(-2), and a low electrolyte/sulfur usage ratio of 3.9. This work demonstrates that vacancy-induced doping of heterogeneous atoms enables durable sulfur electrochemistry and can impact future electrocatalytic designs related to various energy-storage applications.