Synergistic Co-doping effect of CNTs and PVP in Na_(4)MnCr(PO_(4))3 cathode as a strategy for improving the electrochemical performance of SIBs  

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

机构地区：[1]College of Physics,State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,International Center of Future Science,Jilin University,Changchun 130012,China [2]Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen 518055,China [3]State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry,Jilin University,Changchun 130012,China [4]F.D.Ovcharenko Institute of Biocolloidal Chemistry,NAS Ukraine,Kyiv 03142,Ukraine

出　　处：《Chinese Chemical Letters》2024年第2期539-543,共5页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC,Nos.21571080,62174152 and 12204219).

摘　　要：In order to solve the contradiction between the rapidly growing energy demand and the excessive exploitation 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 enhance the energy density of SIB is currently one of the most important topics of scientific research.Advanced high-voltage and low-cost cathode material for SIBs,a composite of carbon-coated Na_(4)MnCr(PO_(4))_(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 composite is significantly improved,and its initial capacity is increased to 114 mAh/g at 0.5 C and 96 mAh/g at 5 C(Mn^(2+)/Mn^(4+)conversion for voltage windows 1.4-4.3 V).Moreover,the multi-electrons transfer of Cr^(3+)/Cr^(4+) and Mn^(2+)/Mn^(4+) 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 stability.In addition,GITT,EIS and CV curves were drawn to better reveal the excellent kinetic properties of Na_(4)MnCr(PO_(4))_(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.

关 键 词：Sodium-ion batteries Na_(4)MnCr(PO_(4))_(3) Carbon nanotubes POLYVINYLPYRROLIDONE Synergistic effect 

分 类 号：TM912[电气工程—电力电子与电力传动] TB332[一般工业技术—材料科学与工程]