首页|Vanadium oxide nanospheres encapsulated in N-doped carbon nanofibers with morphology and defect dual-engineering toward advanced aqueous zinc-ion batteries

Vanadium oxide nanospheres encapsulated in N-doped carbon nanofibers with morphology and defect dual-engineering toward advanced aqueous zinc-ion batteries

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Vanadium-based electrodes are regarded as attractive cathode materials in aqueous zinc ion batteries(ZIBs)caused by their high capacity and unique layered structure.However,it is extremely challenging to acquire high electrochemical performance owing to the limited electronic conductivity,sluggish ion kinetics,and severe volume expansion during the insertion/extraction process of Zn2+.Herein,a series of V2O3 nanospheres embedded N-doped carbon nanofiber structures with various V2O3 spherical mor-phologies(solid,core-shell,hollow)have been designed for the first time by an electrospinning tech-nique followed thermal treatments.The N-doped carbon nanofibers not only improve the electrical conductivity and the structural stability,but also provides encapsulating shells to prevent the vanadium dissolution and aggregation of V2O3 particles.Furthermore,the varied morphological structures of V2O3 with abundant oxygen vacancies can alleviate the volume change and increase the Zn2+ pathway.Besides,the phase transition between V2O3 and ZnXV2O5-m·nH2O in the cycling was also certified.As a result,the as-obtained composite delivers excellent long-term cycle stability and enhanced rate performance for coin cells,which is also confirmed through density functional theory(DFT)calculations.Even assembled into flexible ZIBs,the sample still exhibits superior electrochemical performance,which may afford new design concept for flexible cathode materials of ZIBs.

Aqueous zinc ion batteriesVanadium trioxideOxygen vacancyStructure evolutionPhase optimization

Yunfei Song、Laiying Jing、Rutian Wang、Jiaxi Cui、Mei Li、Yunqiang Zhang

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School of Materials Science and Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,Shandong,China

Institute of Fundamental and Frontier Sciences,University of Electronic Science and Technology of China,Chengdu 610054,Sichuan,China

Natural Science Foundation of Shandong Province,ChinaNatural Science Foundation of Shandong Province,ChinaNatural Science Foundation of Shandong Province,ChinaNew Colleges and Universities Twenty Foundational Projects of Jinan City,ChinaNational Natural Science Foundation of China,ChinaScientific Research Foundation in Qilu University of Technology(Shandong Academy of Sciences),ChinaTalent research project of Qilu University of Technology(Shandong Academy of Sciences),China

ZR2020QE067ZR2020QB117ZR2022MB1432021GXRC068222081742023PY0022023RCKY013

2024

10.1016/j.jechem.2023.10.013

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.89(2)
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