Synergy mechanism of defect engineering in MoS_(2)/FeS_(2)/C heterostructure for high-performance sodium-ion battery  

作　　者：Linlin Ma Xiaomei Zhou Jun Sun Pan Zhang Baoxiu Hou Shuaihua Zhang Ningzhao Shang Jianjun Song Hongjun Ye Hui Shao Yongfu Tang Xiaoxian Zhao 

机构地区：[1]Department of Chemistry,College of Science,Hebei Agricultural University,Baoding 071001,Hebei,China [2]Hebei Key Laboratory of Applied Chemistry,School of Environmental and Chemical Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China [3]College of Chemistry,Nankai University,Tianjin 300071,China [4]Clean Nano Energy Center,State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,Hebei,China [5]College of Physics,Qingdao University,Qingdao 266071,Hebei,China [6]CIRIMAT,UniversitéPaul Sabatier,31062 Toulouse,France

出　　处：《Journal of Energy Chemistry》2023年第7期268-276,I0006,共10页能源化学（英文版）

基　　金：the National Natural Science Foundation of China(NSFC)(22105059,22279112);the Talent Introduction Program of Hebei Agricultural University(YJ201810);the Youth Topnotch Talent Foundation of Hebei Provincial Universities(BJK2022023);the Natural Science Foundation of Hebei Province(B2022203018);the Fok Ying-Tong Education Foundation of China(171064);the Natural Science Foundation of Shandong Province,China(ZR2021QE192);the China Postdoctoral Science Foundation(2018M630747);the 333 Talent Program of Hebei Province(C20221018)for their support。

摘　　要：MoS_(2) is a promising anode material in sodium-ion battery technologies for possessing high theoretical capacity.However,the sluggish Na^(+) diffusion kinetics and low electronic conductivity hinder the promises.Herein,a unique MoS_(2)/FeS_(2)/C heterojunction with abundant defects and hollow structure(MFCHHS)was constructed.The synergy of defect engineering in MoS_(2),FeS_(2),and the carbon layer of MFCHHS with a larger specific surface area provides multiple storage sites of Na^(+)corresponding to the surface-controlled process.The MoS_(2)/FeS_(2)/C heterostructure and rich defects in MoS_(2) and carbon layer lower the Na^(+) diffusion energy barrier.Additionally,the construction of MoS_(2)/FeS_(2) heterojunction promotes electron transfer at the interface,accompanying with excellent conductivity of the carbon layer to facilitate reversible electrochemical reactions.The abundant defects and mismatches at the interface of MoS_(2)/FeS_(2) and MoS_(2)/C heterojunctions could relieve lattice stress and volume change sequentially.As a result,the MFCHHS anode exhibits the high capacity of 613.1 mA h g^(-1)at 0.5 A g^(-1) and 306.1 mA h g^(-1) at 20 A g^(-1).The capacity retention of 85.0%after 1400 cycles at 5.0 A g^(-1) is achieved.The density functional theory(DFT)calculation and in situ transmission electron microscope(TEM),Raman,ex-situ X-ray photon spectroscopy(XPS)studies confirm the low volume change during intercalation/deintercalation process and the efficient Na^(+)storage in the layered structure of MoS_(2) and carbon layer,as well as the defects and heterostructures in MFCHHS.We believe this work could provide an inspiration for constructing heterojunction with abundant defects to foster fast electron and Na^(+) diffusion kinetics,resulting in excellent rate capability and cycling stability.

关 键 词：Defect engineering HETEROSTRUCTURE Hollow structure Sodium-ion battery MoS_(2)/FeS_(2) 

分 类 号：TM912[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]