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作 者:卢超 杨智 汪玉洁 丁艺[3] 向薪程 张垚 LU Chao;YANG Zhi;WANG Yu-jie;DING Yi;XIANG Xin-cheng;ZHANG Yao(School of Mechanical Engineering,Chengdu University,Chengdu 610106,China;School of Resource and Environment,Baoshan University,Baoshan 678000,China;School of National Defence Science and Technology,Southwest University of Science and Technology,Mianyang 621010,China)
机构地区:[1]成都大学机械工程学院,四川成都610106 [2]保山学院资源环境学院,云南保山678000 [3]西南科技大学国防科技学院,四川绵阳621010
出 处:《中国有色冶金》2022年第5期1-7,共7页China Nonferrous Metallurgy
基 金:四川省粉末冶金工程技术研究中心开放基金项目(SC-FMYJ2017-08、SC-FMYJ2021-11);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);成都大学人才工程科研启动项目(2081921012)。
摘 要:水系锌离子电池因其低成本、安全环保等优点在大规模储能领域有着广泛的应用前景,开发出高性能的正极材料至关重要。本文采用简易的水热法制备(NH_(4))_(2)V_(4)O_(9)正极材料,分析不同pH值条件下所合成材料的结构及储锌性能。试验结果显示,pH值对材料的结晶度与相纯度有着较大影响,其中pH=4.5时样品的结晶度和相纯度最高,展现出最佳的电化学性能:在0.1、0.2、0.5、1、2和5 A·g^(-1)电流密度下的可逆容量分别达到385.1、338.8、276.7、232.00、199.5和158.1 mAh·g^(-1),并且在5 A·g^(-1)大电流密度下循环5000次后仍保有121.8 mAh·g^(-1)的放电容量,容量保持率高达86.5%;研究结果表明,纯相(NH_(4))_(2)V_(4)O_(9)优良的循环稳定性及倍率特性得益于其晶体结构中NH_(4)^(+)对VO层的支撑作用及其在大电流密度下的较高赝电容贡献率。Aqueous zinc-ion batteries have broad application prospects in the field of large-scale energy storage due to their low cost,high safety and environmental friendliness.Thus,it is of vital importance to develop high-performance cathode materials.In this paper,a simple hydrothermal method was used to prepare(NH_(4))_(2)V_(4)O_(9) cathode materials.The structure and zinc storage performance of these materials synthesized under different pH values were investigated.It is found that the pH value has a significant influence on the crystallinity and phase purity of the material.The specimen obtained at pH=4.5 demonstrates the highest crystallinity and phase purity,showing the optimal electrochemical properties.Its reversible capacities at current densities of 0.1,0.2,0.5,1,2 and 5 A·g^(-1) are 385.1,338.8,276.7,232.00,199.5 and 158.1 mAh·g^(-1),respectively.A discharge capacity of 121.8 mAh·g^(-1) is still maintained after 5000 cycles at a high current density of 5 A·g^(-1) as well as the capacity retention rate of 86.5%.The results show that the excellent cycling stability and rate capability of pure(NH_(4))_(2)V_(4)O_(9) electrode can benefit from the“pillar”effect of NH_(4)^(+) between the VO layers and the high pseudo capacitive contribution rate at a large current density.
关 键 词:水系锌离子电池 钒基化合物 正极材料 (NH_(4))_(2)V_(4)O_(9) pH值 电化学性能 储锌性能
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