双金属预插层钒基材料在锌离子电池中的电化学行为研究  

Electrochemical behavior of bimetallic pre-inserted vanadium-based materials in zinc ion batteries

作　　者：王玺 陈卓[2] 陈远强[2] 陈素晶[2] 张易宁[2] WANG Xi;CHEN Zhuo;CHEN Yuanqiang;CHEN Sujing;ZHANG Yining(College of Chemistry and Materials,Fujian Normal University,Fuzhou 350007,China;Key Laboratory of Photoelectric Materials Chemistry and Physics,Fujian Institute of Material Structure,Chinese Academy of Sciences,Fuzhou 350002,China)

机构地区：[1]福建师范大学化学与材料学院,福建福州350007 [2]中国科学院福建物质结构研究所光电材料化学与物理院重点实验室,福建福州350002

出　　处：《电子元件与材料》2023年第4期403-411,共9页Electronic Components And Materials

基　　金：中科院STS区域重点项目(KFJ-STS-QYZD-2021-09-001);福建省STS计划配套项目(2021T3036,2020T3004,2019T3017,2020T3030);福建省引导性项目(2020H0040);福州市科技项目(2021-ZD-213);洁净能源研究院-榆林学院联合实验室(Grant No.2021009)。

摘　　要：在锌离子正极材料中,钒基化合物因其成本低、理论容量高而被广泛研究。通过简单水热法合成得到双金属预插层钒基正极。采用XRD、EDS、ICP和TGA等方法,确定了材料的化学式为Na_(0.24)Zn_(0.02)V_(2)O_(5)·1.2H_(2)O(NZVO)。使用3 mol/L Zn(CF_(3)SO_(3))_(2)为电解液,锌片为负极,组装纽扣电池(NZVO‖Zn),使用循环伏安曲线(CV)、电化学阻抗谱(EIS)恒流充放电和倍率对其电化学行为进行分析。在5 A/g电流密度下,经过2000圈循环后比容量可达到102.8 mAh/g,且容量不衰减。通过非原位XRD(Ex-situ XRD)对不同电压下的NZVO进行测试,探究NZVO的储锌机理,并深入研究了赝电容行为对NZVO‖Zn电池性能的影响。研究结果表明,NZVO‖Zn表现出了良好的电化学性能,作为一种高性能的锌离子正极具有广阔的应用前景。Among zinc ion cathode materials,low cost and high theoretical capacity in vanadium-based compounds have been extensively investigated.The bimetallic pre-inserted vanadium-based cathode was obtained by the simple hydrothermal method.The chemical formula of the material was determined to be Na_(0.24)Zn_(0.02)V_(2)O_(5)·1.2H_(2)O by utilizing XRD,EDS,ICP and TGA.The cells(NZVO‖Zn)were assembled using 3 mol/L Zn(CF_(3)SO_(3))2 as the electrolyte and zinc flakes as the cathode electrode,and their electrochemical behavior was analyzed through cyclic voltammetric curves(CV),electrochemical impedance spectroscopy(EIS)with constant current charge-discharge and rate performance.At the current density of 5 A/g,the capacity can reach 102.8 mAh/g after 2000 cycles with no capacity decay.The NZVO was tested by ex-situ XRD at different voltages to investigate the zinc storage mechanism of NZVO,and the effect of pseudo-capacitive behavior on the performance of NZVO‖Zn cells was investigated in detail.The results indicate that NZVO‖Zn exhibits good electrochemical performance and has potential as high performance zinc ion cathode.

关 键 词：锌离子电池 钒基材料 预插层 纳米带 循环稳定性 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ131.12[化学工程—无机化工]