首页|From charge storage mechanism to performance:A strategy toward boosted lithium/sodium storage through heterostructure optimization
From charge storage mechanism to performance:A strategy toward boosted lithium/sodium storage through heterostructure optimization
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Solving the problems of low electrical conductivity and poor cycling durability in transition metal oxides-based anode materials for lithium-ion batteries(LIBs)and sodium-ion batteries(SIBs)has already turned into an urgent requirement.In this paper,we successfully synthesized Co2VO4/Co compounds with Co-V-MOF(metal-organic framework)as a sacrificial template and investigated their electrochemical mecha-nism in order to improve the electrochemical properties of LIBs and SIBs.The optimized heaping config-uration and the existence of metallic Co catalyzed the formation of radical ions,thereby facilitating higher conductivity,shortening Li+and Na+transport paths,and providing more active sites.Co2VO4/Co constructed with 2-methylimidazole as a ligand showed a discharge capacity of 1605.1 mA h g-1 after 300 cycles at 0.1 A g-1 in LIB and 677.2 mA h g-1 in SIB.Density functional theory(DFT)calculation emphasizes the crucial role of Co2VO4/Co in enhancing electrode conductivity,decreasing the migratory energy barrier,and thereby strengthening electrochemical properties.This heterostructure building tech-nique may pave the way for the development of high-performance LIBs and SIBs.Furthermore,the prob-lem of the low first-loop coulombic efficiency faced by transition metal oxides is improved.
Key Laboratory of Theoretical Chemistry of Environment,Ministry of Education,School of Chemistry,South China Normal University,Guangzhou 510006,Guangdong China
National Engineering Research Center for Carbohydrate Synthesis,Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education,Jiangxi Normal University,Nanchang 330022,Jiangxi,China
Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application,School of Chemical and Environmental Engineering,Anhui Polytechnic University,Wuhu 241000,Anhui,China
Open Fund of Energy and Materials Chemistry Joint Laboratory of SCNU and TINCI,China
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