首页|2D-3D dual carbon layer confined ultrasmall VN nanoparticles for improving lithium-ion storage in hybrid capacitors

2D-3D dual carbon layer confined ultrasmall VN nanoparticles for improving lithium-ion storage in hybrid capacitors

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Lithium-ion capacitors(LICs)of achieving high power and energy density have garnered significant atten-tion.However,the kinetics unbalance between anode and cathode can impede the application of LICs.Vanadium nitride(VN)with a high theoretical specific capacity(～1200 mAh·g-1)is a better pseudocapacitive anode to match the response of cathode in LICs.However,the insertion/extraction of Li-ions in VN's operation results in significant volume expansion.Herein,the VN/N-rGO-5 composite that three-dimentional(3D)dicyandiamide-derived-carbon(DDC)tightly wrapped VN quantum dots(VN QDTs)on two-dimentional(2D)reduced graphene oxid(rGO)was prepared by a facile strategy.The VN QDTs can reduce ion diffusion length and improve charge transfer kinetics.The 2D rGO as a template provides support for nanoparticle dispersion and improves electrical conductivity.The 3D DDC tightly encapsulated with VN QDTs mitigates agglomeration of VN particles as well as volume expansion.Correspondingly,the LICs with VN/N-rGO-5 composite as anode and activated carbon(AC)as cathode were fabricated,which exhibits a high energy density and power density.Such strategy provides a per-spective for improving the electrochemical properties of LIC anode materials by suppressing volume expansion and enhancing conductivity.

Vanadium nitride(VN)quantum dotsReduced graphene oxide(rGO)nanosheetsDicyandiamide-derived-carbon2D-3D dual carbon layerLithium-ion capacitors

Zhao-Wei Hu、Hui-Fang Li、Peng Wang、Wan-Li Wang、Lei Yang、Xiao-Jun Wang、Zhi-Ming Liu

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College of Electromechanical Engineering,Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials,Qingdao University of Science & Technology,Qingdao 266061,China

Research Center for Intelligent and Wearable Technology,College of Textiles and Clothing,Qingdao University,Qingdao 266071,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaShandong Provincial Natural Science Foundation of ChinaShandong Provincial Natural Science Foundation of ChinaShandong Provincial Natural Science Foundation of ChinaChina Postdoctoral Science FoundationChina Postdoctoral Science FoundationChina Postdoctoral Science FoundationQingdao Postdoctoral Applied Research Project,Taishan Scholar Project of Shandong Province of ChinaYouth Innovation Team Project for Talent Introduction and Cultivation in Universities of Shandong Province

2200516721905152ZR2020QB125ZR2020MB045ZR2022QE0032021M6932562021T1406872022M713249tsqn202211160

2024

10.1007/s12598-023-02432-8

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(1)
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