Flower-like NiCo_(2)S_(4)nanosheets with high electrochemical performance for sodium-ion batteries
作者机构：Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education)Jilin Key Engineering Laboratory of New Energy Materials and TechnologiesCollege of PhysicsJilin UniversityChangchun130012China State Key Laboratory of Inorganic Synthesis and Preparative ChemistryCollege of ChemistryJilin UniversityChangchun130012China Key Laboratory of Eco-Chemical Engineering(Ministry of Education)College of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao266042China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2020年第13卷第11期
页 面：3041-3047页
核心收录：
基 金：supported by funding from“973”project(No.2015CB251103) the National Natural Science Foundation of China(No.21771086) S&T Development Program of Jilin Province(Nos.20160101320JC and 20180101293JC) Jilin Provincial Department of Education“13th Five-Year”scientific research project(No.JJKH20180116KJ)
主 题：NiCo_(2)S_(4) sodium-ion batteries anode materials sodium storage mechanism pseudocapacitance
摘 要：A three-dimensional flower-like NiCo_(2)S_(4) formed by two-dimensional nanosheets is synthesized by a facile hydrothermal method and utilized as the anode for sodium-ion *** have shown that materials can achieve the best performance under the ether-based electrolyte system with voltage ranging from 0.3 to 3 V,which could effectively avoid the dissolution of polysulfides and over-discharge of the ***,sodium storage mechanism and charge compensation behaviors of this ternary metal sulfide are comprehensively investigated by ex situ X-ray ***,ex situ Raman spectra,ex situ X-ray photoelectron spectroscopy and transmission electron microscopy measurements are used to related tests for the first ***,quantitative kinetic analysis unravels that sodium storage partially depends on the pseudocapacitance mechanism,resulting in good specific capacity and excellent rate *** initial discharge capacity is as high as 748 mAh·g^(−1)at a current density of 0.1 A·g^(−1)with the initial coulomb efficiency of 94%,and the capacity can still maintain at 580 mAh·g^(−1)with the Coulomb efficiency close to 100%after following 50 ***,by the long cycle test at a high current density of 2 A·g^(−1),the capacity can still reach at 376 mAh·g^(−1)after over 500 cycles.
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