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

Zhao-Wei Hu ¹Hui-Fang Li ¹Peng Wang ¹Wan-Li Wang ¹Lei Yang ²Xiao-Jun Wang ¹Zhi-Ming Liu¹

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作者信息

1. College of Electromechanical Engineering,Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials,Qingdao University of Science & Technology,Qingdao 266061,China
2. Research Center for Intelligent and Wearable Technology,College of Textiles and Clothing,Qingdao University,Qingdao 266071,China
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Abstract

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.

Key words

Vanadium nitride(VN)quantum dots/Reduced graphene oxide(rGO)nanosheets/Dicyandiamide-derived-carbon/2D-3D dual carbon layer/Lithium-ion capacitors

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基金项目

National Natural Science Foundation of China(22005167)

National Natural Science Foundation of China(21905152)

Shandong Provincial Natural Science Foundation of China(ZR2020QB125)

Shandong Provincial Natural Science Foundation of China(ZR2020MB045)

Shandong Provincial Natural Science Foundation of China(ZR2022QE003)

China Postdoctoral Science Foundation(2021M693256)

China Postdoctoral Science Foundation(2021T140687)

China Postdoctoral Science Foundation(2022M713249)

Qingdao Postdoctoral Applied Research Project,Taishan Scholar Project of Shandong Province of China(tsqn202211160)

Youth Innovation Team Project for Talent Introduction and Cultivation in Universities of Shandong Province()

出版年

2024

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

参考文献量41

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