摘要
以NH_(4)VO_(3)和C_(2)H_(2)O_(4)·2H_(2)O为原料,采用简易的一步水热法制备出水系锌离子电池正极材料(NH_(4))_(2)V_(4)O_(9)。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、恒流充放电(GCD)、恒流间歇滴定技术(GITT)、循环伏安法(CV)以及电化学阻抗谱(EIS)等表征测试手段,研究不同水热反应时间(16、20和24 h)对(NH_(4))_(2)V_(4)O_(9)结构、形貌及电化学性能的影响。研究结果表明:水热反应20 h合成的(NH_(4))_(2)V_(4)O_(9)拥有最高的结晶度,并表现出优异的电极反应动力学特性以及最佳的倍率性能和循环稳定性,其在0.1、0.2、0.5、1、2 A/g和5 A/g的电流密度下分别提供了554.6、472.2、386.6、322.6、266.2 mAh/g和199.5 mAh/g的高放电比容量,并且在5 A/g的大电流密度下长循环10000圈后仍可保持159.7 mAh/g的放电比容量,容量保持率高达80.1%。
(NH_(4))_(2)V_(4)O_(9)as cathode material for aqueous zinc ion batteries was prepared by a facile one-step hydrothermal method using NH_(4)VO_(3) and C_(2)H_(2)O_(4)·2H_(2)O as raw materials.X-ray diffractometer(XRD),scanning electron microscope(SEM),galvanostatic charge-discharge(GCD),galvanostatic intermittent titration technique(GITT),cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS)were used to investigate the effects of hydrothermal reaction time(16,20 h and 24 h)on the structure,morphology and electrochemical properties of(NH_(4))_(2)V_(4)O_(9).The results show that(NH_(4))_(2)V_(4)O_(9)synthesized by hydrothermal reaction for 20 h has the highest crystallinity,electrode reaction kinetics,and rate capability as well as cyclic stability,delivering high discharge specific capacities of 554.6,472.2,386.6,322.6,266.2 and 199.5 mAh/g at current densities of 0.1,0.2,0.5,1,2 and 5 A/g,respectively.It can also maintain a discharge capacity of 159.7 mAh/g after 10000 long-term cycles at a high current density of 5 A/g,showing a capacity retention of up to 80.1%.
作者
卢超
杨智
汪玉洁
丁艺
李涛
王恒
唐博闻
Lu Chao;Yang Zhi;Wang Yujie;Ding Yi;Li Tao;Wang Heng;Tang Bowen(School of Mechanical Engineering,Chengdu University,Chengdu 610106,Sichuan,China;College of Resource and Environment,Baoshan University,Baoshan 678000,Yunnan,China;School of National Defence Science&Technology,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)
出处
《钢铁钒钛》
CAS
北大核心
2022年第4期62-68,共7页
Iron Steel Vanadium Titanium
基金
云南省高校怒江河谷生物质资源高值转化与利用实验室开放基金(Z386)
核废物与环境安全国防重点学科实验室开放基金(21kfhk02)
四川省粉末冶金工程技术研究中心开放基金(SC-FMYJ2021-11)。
