Effect of VO4^3- Substitution on the Electrochemical Properties of a LiSn2（PO4）3 Anode Material

作     者：FENG Xiaojing HE Jun WANG Xiaoran WANG Gongkai WANG Xin PENG Huifen 

作者机构：School of Material Science & Engineering Hebei University of Technology Tianjin 300130 P. R. China Research Institute for Energy Equipment Materials Hebei University of Technology Tianjin 300130 P. R. China Tianjin Key Laboratory of Materials Laminating Fabrication & Interface Control Teehnologyo Hebei University of Technology Tianjin 300130 P. R. China 

出 版 物：《Chemical Research in Chinese Universities》 (高等学校化学研究（英文版）)

年 卷 期：2018年第34卷第3期

页      面：444-450页

核心收录：

学科分类：081704[工学-应用化学] 0808[工学-电气工程] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学] 

基　　金：Supported by the Natural Science Foundation of Hebei Province  China(No.E2016202358) 

主　　题：Sn-based material Anode material LiSn2(PO4)3 VO43- substitution Electrochemical property 

摘      要：VO4^3- anion was used to partially substitute for PO43 in the Nasicon compound of LiSn2（PO4）3 via a sol-gel method. XRD analysis revealed that the VO4^3-substituted samples did not have a single LiSn2（PO4）3 phase, and some secondary phases like SnO2 and SnP2O7 appeared. Introduction of the VO4^3- anion did not prevent the LiSn2（PO4）3 compound from decomposing during the initial lithiation; however the VO4^3- anion substitution remarkably enhanced the rate capability and cycling performance of the products because they reduced the charge transfer hnpedance, increased the lithium ion diffusion, and strengthened the role of the Li3PQ matrix due to the precipitation of the Li3V04 phase, Of the substituted samples, the sample with a nominal composition of LiSn2（PO4）2.5（VO4）0.5 delivered a capacity of 449.2 mA-h/g at a rate of 0.25 C after 25 cycles and 373.8 mA.h/g at 2 C rate. Those values surpassed some previous reports on LiSn2（PO4）3 and the LiSnz（PO4）3/C composites. Accordingly, the partial substitution of phosphorus by vanadium in LiSn2（PO4）3 is a feasible technique to remarkably improve its electrochemical properties.