Nitrogen-doped Carbon Coated Na3V2(PO4)3 with Superior Sodium Storage Capability

查看全文 作　　者：XU [1]Laiqiang;LI [1]Jiayang;LI [1]Yitong;CAI [1]Peng;LIU [1]Cheng;ZOU [1]Guoqiang;HOU [1]Hongshuai;HUANG [3]Lanping;JI [1,2]Xiaobo

机构地区：[1]College of Chemistry and Chemical Efigineenng,Central South University\Changsha 410083,P.R.China;[2]School of Metallurgy and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,P.R.China;[3]Science and Technology on High Strength Structural Materials Laboratory,Central South University Changsha 410083,P.R.China

出　　处：《Chemical Research in Chinese Universities》索引2020年第36卷第3期,共8页

基　　金：the National Key Research and Development Program of China(Nos.2017YFB0102000,2018YFB0104200);the Central South University Postdoctoral Foundation,China(No.140050018);the National Natural Science Foundation of China(Nos.51904342,51622406,and 21673298);the Young Elite Scientists Sponsorship Program by China Association for Science and Technology(CAST)(No.2017QNRC001);the Innovation Mover Program of Central South University,China(Nos.2018CX005,2017CX004);the Hunan Provincial Natural Science Foundation,China(No.2018JJ3633)。 摘　　要：Cathodes with high cycling stability and rate capability are required for ambient temperature sodium ion batteries in renewable energy storage application.Na3V2(PO4)3 is an attractive cathode material with excellent electrochemical stability and fast ion diffusion coefficient within the 3D NASICON structure.Nevertheless,the practical application of Na3V2(PO4)3 is seriously hindered by its intrinsically poor electronic conductivity.Herein,solvent evaporation method is presented to obtain the nitrogen-doped carbon coated Na3V2(PO4)3 cathode material,delivering cnhanced clectrochemical performances.N-Doped carbon layer coating servfes as a highly conducting pathway,and creates numerous extrinsic defects and active sites,which can facilitate the storage and diffusion of Na^+.Morcover,the N-doped carbon layer can provide a stable framework to accommodate the agglomeration of the electrode upon electrode cycling.N-Doped carbon coated Na3V2(PO4)3(NC-NVP)exhibits excellent long cycling life and superior rate performances than bare Na3V2(PO4)3 without carbon coating.NC-NVP delivers a stable capacity of 95.9mA·h/g after 500 cycles at 1C rate,which corresponds to high capacity retention(94.6%)with respect to the initial capacity(101.4mA·h/g).Over 91.3% of the initial capacity is retained after 500 cycles at 5C,and the capacity can reach 85mA·h/g at 30C rate. 关键词：CATHODE Sodium ion battery Na3V2(PO4)3 Nitrogen-doped carbon

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Nitrogen-doped Carbon Coated Na3V2(PO4)3 with Superior Sodium Storage Capability

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