摘要
Biphasic and multiphasic compounds have been well clarified to achieve extraordinary electrochemical properties as advanced energy storage materials.Yet the role of phase boundaries in improving the performance is remained to be illustrated.Herein,we reported the biphasic vanadate,that is,Na_(1.2)V_(3)O_(8)/K_(2)V_(6)O_(16)·1.5H_(2)O(designated as Na0.5K0.5VO),and detected the novel interfacial adsorption-insertion mechanism induced by phase boundaries.Firstprinciples calculations indicated that large amount of Zn^(2+)and H^(+)ions would be absorbed by the phase boundaries and most of them would insert into the host structure,which not only promote the specific capacity,but also effectively reduce diffusion energy barrier toward faster reaction kinetics.Driven by this advanced interfacial adsorption-insertion mechanism,the aqueous Zn/Na_(0.5)K_(0.5)VO is able to perform excellent rate capability as well as long-term cycling performance.A stable capacity of 267 mA h g^(-1)after 800 cycles at 5 A g^(-1)can be achieved.The discovery of this mechanism is beneficial to understand the performance enhancement mechanism of biphasic and multiphasic compounds as well as pave pathway for the strategic design of highperformance energy storage materials.
出处
《InfoMat》
SCIE
CAS
2021年第9期1028-1036,共9页
信息材料（英文）
基金
National Natural Science Foundation of China,Grant/Award Numbers:51932011,51802356,51972346
Open Sharing Fund for the Large-scale Instruments and Equipments of Central South University,Grant/Award Number:CSUZC202003
Innovation-Driven Project of Central South University,Grant/Award Number:2020CX024
Program of Youth Talent Support for Hunan Province,Grant/Award Number:2020RC3011。
作者简介
Correspondence:Shuquan Liang,School of Materials Science and Engineering,Central South University,Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province,Changsha 410083,Hunan,People's Republic of China.Email:lsq@csu.edu.cn;Correspondence:Jiang Zhou,School of Materials Science and Engineering,Central South University,Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province,Changsha 410083,Hunan,People's Republic of China.Email:zhou_jiang@csu.edu.cn,https://orcid.org/0000-0003-0858-4533;Correspondence:Bingan Lu,School of Physics and Electronics,Hunan University,Changsha 410082,People's Republic of China.Email:luba2012@hnu.edu.cn。
