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In situ fabrication of Na3V2(PO4)3 quantum dots in hard carbon nanosheets by using lignocelluloses for sodium ion batteries

查看全文 作　　者：Qihao [1]Zhang;Xudong [1]Zhang;Wen [1]He;Guogang [2]Xu;Manman [1]Ren;Jinhua [1]Liu;Xuena [1]Yang;Feng [1]Wang 高影响力作者 机构地区：[1]Institute of Materials Science and Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China;[2]College of Material Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2019年第35卷第10期,共8页高影响力期刊 基　　金：supported financially by the National Natural Science Foundation of China (Nos. 51672139, 51472127 and 51272144);the Projects Supported by the Key Laboratory of Pulp and Paper Science and Technology of Ministry of Education (No. KF2016-01) 摘　　要：The rational assembly of quantum dots on two-dimensional(2 D) carbonaceous materials is very promising to produce materials, but remains a challenge. Here, we develop an assembly strategy of growing Na3 V2(PO4)3 quantum dots with superlattice structure(NVP-QDs-SL) for obtaining precise control of the size, distribution and crystallinity. The multifunctional lignocelluloses(LCs) used as a hard carbon source induce heterogeneous nucleation and confined growth of NVP-QDs-SL, leading to the uniform distribution of NVP-QDs-SL in H/S-doped hard carbon ultra-thin nanosheets(HCS). Detailed electrochemical analysis results from sodium-ion batteries of NVP-QDs-SL show that NVP-QDs-SL could trap the electrons inside HCS, significantly enhancing Na ion storage and transfer kinetics. Compared to the common Na3 V2(PO4)3 nanoparticle cathode, the NVP-QDs-SL/HCS cathode exhibits a high reversible capacity of 149.2 m A h g^-1 at a 0.1 C rate, which is far beyond the theoretical capacity of Na3 V2(PO4)3(117.6 m A h g^-1).At the ultrahigh current rate of 100 C, this cathode still remains a high discharge capacity of 40 m A h g-1.Even after cycling at 20 C over 3000 cycles, an ultrahigh coulombic efficiency close to 100% is still obtained,highlighting its excellent long cycling life, remarkable rate performance and energy density. 关 键 词：LIGNOCELLULOSE Hard carbon NANOSHEET Na3V2(PO4)3 quantum DOT SUPERLATTICE structure
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