Unraveling high efficiency multi-step sodium storage and bidirectional redox kinetics synergy mechanism of cobalt-doping vanadium disulfide anode

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外文摘要：Sodium-based storage devices based on conversion-type metal sulfide anodes have attracted great atten-tion due to their multivalent ion redox reaction ability.However,they also suffer from sodium polysul-fides(NaPSs)shuttling problems during the sluggish Na+redox process,leading to"voltage failure"and rapid capacity decay.Herein,a metal cobalt-doping vanadium disulfide(Co-VS2)is proposed to simulta-neously accelerate the electrochemical reaction of VS2 and enhance the bidirectional redox of soluble NaPSs.It is found that the strong adsorption of NaPSs by V-Co alloy nanoparticles formed in situ during the conversion reaction of Co-VS2 can effectively inhibit the dissolution and shuttle of NaPSs,and ther-modynamically reduce the formation energy barrier of the reaction path to effectively drive the complete conversion reaction,while the metal transition of Co elements enhances reconversion kinetics to achieve high reversibility.Moreover,Co-VS2 also produce abundant sulfur vacancies and unsaturated sulfur edge defects,significantly improve ionic/electron diffusion kinetics.Therefore,the Co-VS2 anode exhibits ultrahigh rate capability(562 mA h g-1 at 5 A g-1),high initial coulombic efficiency(≈90％)and 12,000 ultralong cycle life with capacity retention of 90％in sodium-ion batteries(SIBs),as well as impressive energy/power density(118 Wh kg-1/31,250 W kg-1)and over 10,000 stable cycles in sodium-ion hybrid capacitors(SIHCs).Moreover,the pouch cell-type SIHC displays a high-energy density of 102 Wh kg-1 and exceed 600 stable cycles.This work deepens the understanding of the electrochem-ical reaction mechanism of conversion-type metal sulfide anodes and provides a valuable solution to the shuttling of NaPSs in SIBs and SIHCs.

外文关键词：

Sodium-ion batteriesSodium-ion hybrid capacitorsPouch cellsVanadium disulfideShuttle effect

作者：

Enzhi Li、Mingshan Wang、Yuanlong Feng、Lin Yang、Qian Li、Zhenliang Yang、Junchen Chen、Bo Yu、Bingshu Guo、Zhiyuan Ma、Yun Huang、Jiangtao Liu、Xing Li

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作者单位：

School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,Sichuan,China

Institute of Materials,China Academy of Engineering Physics,Mianyang 621908,Sichuan,China

State Key Laboratory of Advanced Chemical Power Sources,Guizhou Meiling Power Sources Co.Ltd.,Zunyi 563003,Guizhou,China

School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaDepartment of Science and Technology of Sichuan Province(CN)Department of Science and Technology of Sichuan Province(CN)Department of Science and Technology of Sichuan Province(CN)Production-Education Integration Demonstration Project of Sichuan Province

项目编号：

5207232222209137516042502022YFG029423GJHZ014723ZDYF0262Sichuan Financial Education[2022]106.n

出版年：

2024

DOI：

10.1016/j.jechem.2024.03.002

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)：2024.94(7)