Al3+预嵌（NH4）2V10O25·8H2O正极材料在水系锌离子电池的应用

被引：5

作者：

张涛 ^{[1
]}

周坤蕃 ^{[1
]}

阳思念 ^{[1
]}

李玉婷 ^{[1
]}

向延鸿 ^{[2
]}

吴贤文 ^{[1
]}

机构：

[1] 吉首大学化学化工学院

[2] 吉首大学物理与机电工程学院

来源：

精细化工 | 2022年 / 39卷 / 02期

关键词：

水系锌离子电池; 水热法; 电化学性能; 正极材料; 钒酸铵; 功能材料;

D O I：

10.13550/j.jxhg.20210902

中图分类号：

TM912 [蓄电池];

学科分类号：

摘要：

以NH4VO3为钒源、二水合草酸（C2H2O4·2H2O）为还原剂,采用水热法合成了（NH4）2V10O25·8H2O（NVO）纯相,以Al（NO3）3·9H2O为铝源对材料进行层间Al3+预嵌改性得到Al3+预嵌的（NH4）2V10O25·8H2O（Al-6NVO）材料,通过XRD、SEM、TEM以及EDS对材料进行了表征,采用恒流充放电、循环伏安及恒电流间歇式滴定技术对其电化学性能进行了测试。结果表明,Al3+均匀分散于材料中,Al3+预嵌使材料形貌由密集堆叠的片状结构向更细小更分散的纳米片状结构转变。Al3+预嵌能有效提高材料的比容量、倍率性能及循环稳定性能。Al-6NVO在0.5 A/g电流密度下首次放电比容量为329 m A·h/g,经过100次循环,比容量为252 m A·h/g。在2.0 A/g电流密度下,经过1200次循环容量仍可达122.8 m A·h/g,容量保持率高达94.6%。通过不同扫描速率下的循环伏安及赝电容计算,层间预嵌Al3+有效提高了Zn2+的扩散动力学,改善了材料的电化学性能。

引用

页码：282 / 287+336 +336

页数：7

共 22 条

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