复相磷酸钒钠正极材料的合成与性能研究  

Synthesis and Properties of Multiphase Sodium Vanadium Phosphate Cathode Materials

作　　者：王钏 宁瑞琦 Wang Chuan;Ning Ruiqi(Wuhan Institute of Marine Electric Propulsion,Wuhan 430064,China)

机构地区：[1]武汉船用电力推进装置研究所,武汉430064

出　　处：《船电技术》2022年第10期141-144,共4页Marine Electric & Electronic Engineering

摘　　要：磷酸钒钠材料作为应用最广泛的钠离子电池正极材料,具有良好的循环稳定性,但同时也存在电导率低、工作电压低等问题。本文针对这一问题,采用喷雾干燥法合成了CNTs掺杂的复相磷酸钒钠Na_(3)V_(2)(PO_(4))_(3)/Na_(3)V_(3)(PO_(4))_(4)。结果表明合成温度对材料的成分和电化学性能影响显著,在750℃下合成的材料电化学性能最优,即使在10 C的大电流密度下,比容量仍高达96.6 mAh g^(-1)。该材料与纯相材料相比,具有很大优势,有望应用于大规模储能系统、深海空间站等领域。As the most widely used cathode material for sodium-ion batteries,sodium vanadium phosphate material has good cycle stability,but it also has problems such as low conductivity and low operating voltage.Aiming at this problem,the CNTs-doped multiphase sodium vanadium phosphate Na_(3)V_(2)(PO_(4))_(3)/Na_(3)V_(3)(PO_(4))_(4) was synthesized by spray drying method.The results show that the synthesis temperature has a significant effect on the composition and electrochemical properties of the materials.The electrochemical properties of the materials synthesized at 750℃ are the best.Even at a high current density of 10 C,the specific capacity is still as high as 96.6 mAh g^(-1).Compared with pure phase materials,this material has great advantages and is expected to be used in large-scale energy storage systems,deep-sea space stations and other fields.

关 键 词：钠离子电池 大规模储能 磷酸钒钠 复相材料 喷雾干燥 

分 类 号：TQ174.1[化学工程—陶瓷工业]