首页|Synergistic Co-doping effect of CNTs and PVP in Na4MnCr(PO4)3 cathode as a strategy for improving the electrochemical performance of SIBs

Synergistic Co-doping effect of CNTs and PVP in Na4MnCr(PO4)3 cathode as a strategy for improving the electrochemical performance of SIBs

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In order to solve the contradiction between the rapidly growing energy demand and the excessive ex-ploitation of fossil fuels,it is urgent to research and develops more environmentally friendly and efficient energy storage technologies.Therefore,the development of high-performance cathode materials to en-hance the energy density of SIB is currently one of the most important topics of scientific research.Ad-vanced high-voltage and low-cost cathode material for SIBs,a composite of carbon-coated Na4MnCr(PO4)3(NASICON-type),polyvinylpyrrolidone(PVP),and modified carbon nanotubes(CNTs)is prepared by sol-gel and freeze-drying method.Due to the high conductivity of CNTs,the conductivity of the compos-ite is significantly improved,and its initial capacity is increased to 114 mAh/g at 0.5 C and 96 mAh/g at 5 C(Mn2+/Mn4+conversion for voltage windows 1.4-4.3 V).Moreover,the multi-electrons transfer of Cr3+/Cr4+and Mn2+/Mn4+can provide a high capacity of 165 mAh/g at 0.1 C and 102 mAh/g at 5 C in the high voltage window of 1.4-4.6 V.Furthermore,PVP can effectively inhibit the Jahn-Teller effect caused by Mn ion,making the composite have more excellent high-rate performance and stabil-ity.In addition,GITT,EIS and CV curves were drawn to better reveal the excellent kinetic properties of Na4MnCr(PO4)3@C@PVP@CNT cathode,and the mechanism of its performance improvement is deeply studied and discussed.Accordingly,the co-doping of CNTs and PVP is a simple way to high conductivity and fast charging of cathode materials for SIBs.

Sodium-ion batteriesNa4MnCr(PO4)3Carbon nanotubesPolyvinylpyrrolidoneSynergistic effect

Ruoyu Chen、Denys S.Butenko、Shilin Li、Xinyu Zhang、Guangshe Li、Igor V.Zatovsky、Wei Han

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College of Physics,State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,International Center of Future Science,Jilin University,Changchun 130012,China

Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen 518055,China

State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry,Jilin University,Changchun 130012,China

F.D.Ovcharenko Institute of Biocolloidal Chemistry,NAS Ukraine,Kyiv 03142,Ukraine

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国家自然科学基金国家自然科学基金国家自然科学基金

215710806217415212204219

2024

10.1016/j.cclet.2023.108358

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(2)
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