A Polyanionic,Quasi-zero-strain and Open-framework K_(0.76)V_(0.55)Nb_(0.45)OPO_(4) for Sodium-ion Batteries  

作　　者：LIU Jian-Dong-Yong YU Xu BAO Jing-Ze LIN Ying-Xi 刘鉴冬涌;余旭;包敬泽;林迎曦(C45 Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China;College of Chemistry,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]C45 Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China [2]College of Chemistry,Fuzhou University,Fuzhou 350108,China

出　　处：《Chinese Journal of Structural Chemistry》2021年第12期1631-1638,1553,共9页结构化学（英文）

基　　金：This project was supported by the National Natural Science Foundation of China(No.21771180)。

摘　　要：A carbon-coated K_(0.76)V_(0.55)Nb_(0.45)OPO_(4)(KVNP@C)polyanion material was successfully synthesized by a simple sol-gel method.The KVNP@C possesses a highly stable inorganic open-framework structure,which is hard to be affected by the Na^(+) intercalation/deintercalation when used as an anode material for sodium-ion batteries(NIBs).The assembled KVNP@C/Na half-cell shows a capacity retention of 81.2%and an average Coulombic efficiency of 99.8%at a current density of 300 mA/g after 1500 cycles.In-situ XRD analysis reveals a single-phase solid solution reaction mechanism with a lattice expansion of 4.76%.This work sheds insights into the quest for developing novel polyanion-based anode materials for sodium-ion batteries.

关 键 词：anode material sodium-ion batteries high structural stability solid solution reaction 

分 类 号：TM912[电气工程—电力电子与电力传动] TB30[一般工业技术—材料科学与工程]