摘要
水系锌离子电池(AZIBs)因具有安全可靠、环境友好与成本低廉等优点,可作为先进的储能设备.然而,正极材料的结构稳定性差与动力学性能缓慢极大阻碍了AZIBs的广泛应用.采用简易的一步水热法首次制备出硼酸改性的锰/水分子共插层的AZIBs钒基正极材料Mn_(0.163)V_(2)O_(5)(OH)_(0.59)·0.62H_(2)O.利用X射线衍射仪、扫描电子显微镜、热重分析、恒流充放电测试、循环伏安法及电化学阻抗谱等表征测试手段,研究硼酸与五氧化二钒中硼元素(B)和钒元素(V)在不同摩尔比条件下(B∶V=0、0.4、0.8和1.2)对Mn_(0.163)V_(2)O_(5)(OH)_(0.59)·0.62H_(2)O的结构、形貌及电化学性能的影响.结果表明,B∶V摩尔比为0.8时,所得产物的尺寸更加规整均匀、内部结构更为蓬松多孔,有利于锌离子的可逆存储与快速扩散,展现出最佳的电化学性能;其在0.1、0.2、0.5、1、2和5 A/g电流密度下的放电比容量分别达到383.5、345.67、281.09、236.03、180.17和118.28 mAh/g;在10 A/g的大电流密度下,循环10000次后容量保持率高达95.2%,具有优异的倍率性能和循环稳定性.
Aqueous zinc-ion batteries(AZIBs)can be advanced energy storage devices due to their advantages including safety,environmental friendliness and low cost.However,the poor structural stability and slow kinetics of the cathode materials greatly hinder the wide application of AZIBs.In this paper,boric acid-modified manganese/water molecule co-intercalated vanadium-based cathode material Mn_(0.163)V_(2)O_(5)(OH)_(0.59)·0.62H_(2)O is prepared for the first time by a simple one-step hydrothermal method.Characterization tests such as X-ray diffractometry,scanning electron microscope,thermogravimetric analysis,constant-current charge/discharge test,cyclic voltammetry,and electrochemical impedance spectroscopy are utilized to investigate the effects of the boron and vanadium elements in boric acid and vanadium pentosxide under different molar ratio conditions(B∶V=0,0.4,0.8,and 1.2)on the structure,morphology,and electrochemical properties of Mn_(0.163)V_(2)O_(5)(OH)_(0.59)·0.62H_(2)O.The results show that the product obtained with a B∶V molar ratio of 0.8 has a more regular and uniform size,and a fluffy and porous internal structure,which is favorable for the reversible storage and rapid diffusion of zinc-ions,and exhibits the best electrochemical performance.The discharge specific capacities are 383.5,345.67,281.09,236.03,180.17 and 118.28 mAh/g at current densities of 0.1,0.2,0.5,1,2,and 5 A/g,respectively.The capacity retention rate is as high as 95.2%after 10000 cycles at a high current density of 10 A/g,showing excellent rate capability and cyclic stability.
作者
陈兴
卢超
CHEN Xing;LU Chao(School of Mechanical Engineering,Chengdu University,Chengdu 610106,China)
出处
《成都大学学报(自然科学版)》
2025年第4期399-406,共8页
Journal of Chengdu University(Natural Science Edition)
基金
成都大学人才工程科研启动项目(2081921012)。
关键词
水系锌离子电池(AZIBs)
钒基正极材料
硼酸改性
电化学性能
aqueous zinc-ion batteries(AZIBs)
vanadium-based cathode material
boric acid-modified
electrochemical properties
