铵钒氧化物的可控水热合成及其储锌性能  

Controllable hydrothermal synthesis and zinc storage properties of ammonium vanadium oxides

作　　者：杨智 汤云淇 卢超 龚铭 Yang Zhi;Tang Yunqi;Lu Chao;Gong Ming(School of Mechanical Engineering,Chengdu University,Chengdu 610106,Sichuan,China;Jiangsu Donghua Testing Technology Co.,Ltd.,Jingjiang 214500,Jiangsu,China)

机构地区：[1]成都大学机械工程学院,四川成都610106 [2]江苏东华测试技术股份有限公司,江苏靖江214500

出　　处：《钢铁钒钛》2023年第6期24-31,共8页Iron Steel Vanadium Titanium

基　　金：教育部产学合作协同育人项目(220804429175326);成都大学2021年高等教育人才培养质量和教学改革项目(cdjgb2022094);四川省粉末冶金工程技术研究中心开放基金(SC-FMYJ2021-11);成都大学大学生创新创业训练计划项目(CDUCX2022071)。

摘　　要：铵钒氧化物作为水系锌离子电池正极材料具有轻质、高容量等特点,但其可控合成仍面临挑战。采用乙二醇(EG)辅助调控的一步水热法成功制备出一系列物相与形貌不同的铵钒氧化物。研究表明,当EG添加量由0 mL增加到1.6 mL,水热产物由带状(NH_(4))_(2)V_(6)O_(16)转变为棒状NH_(4)V_(4)O_(10);当EG添加量为18 mL时,所得产物为片状(NH_(4))_(2)V_(4)O_(9)。对比发现,棒状NH_(4)V_(4)O_(10)表现出最佳的电化学性能,其在0.1 A/g电流密度下展现出415.8 mAh/g的高比容量,经过12000次循环(10 A/g电流密度下)后的容量保持率高达94.1%。NH_(4)V_(4)O_(10)卓越的电化学性能得益于其单连接的氧原子与NH_(4)^(+)之间相互作用形成的稳定层状结构,有效增强了其循环稳定性,纳米棒状形貌以及明显的电容效应提升了其倍率性能和动力学特性。Ammonium vanadium oxides are promising cathode materials for aqueous zinc-ion batteries due to their lightweight and high capacity,however,the controlled synthesis still remains a challenge.A series of ammonium vanadium oxides with different phases and morphologies were successfully synthesized by one-step hydrothermal method with the assistance of ethylene glycol(EG)regulation.The results showed that the product transformed from ribbon-shaped(NH_(4))_(2)V_(6)O_(16)to rod-like NH_(4)V_(4)O_(10)with the increase of EG addition from 0 mL to 1.6 mL,and then evolved into plate-like(NH_(4))_(2)V_(4)O_(9) with the addition of 18 mL EG.By Comparison,rod-like NH_(4)V_(4)O_(10)exhibited the best electrochemical performance,demonstrating a high specific capacity of 415.8 mAh/g at the current density of 0.1 A/g,and maintaining a high capacity retention of 94.1%after 12000 cycles at a high current density of 10 A/g.The excellent cycling stability of NH_(4)V_(4)O_(10)can be attributed to its stable layered structure formed by the interactions between oxygen atoms and NH_(4)^(+)ions.Furthermore,the nanorod-like morphology and evident capacitive effect contribute to the promotion of its rate capability and kinetic properties.

关 键 词：铵钒氧化物 水热法 锌离子电池 正极材料 乙二醇 

分 类 号：TF841.3[冶金工程—有色金属冶金] TM911[电气工程—电力电子与电力传动]