Page 83 - 《精细化工》2022年第2期

3+
第 2 期 张 涛，等: Al 预嵌(NH 4 ) 2 V 10 O 25 ·8H 2 O 正极材料在水系锌离子电池的应用 ·287·

3 结论

通过水热法成功合成了(NH 4 ) 2 V 10 O 25•8H 2O(NVO)
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与 Al 层间预嵌的(NH 4 ) 2 V 10 O 25 •8H 2 O(Al-6NVO)正
极材料，以 2 mol/L ZnSO 4 为电解液，商业锌片为负
极组装 AZIBs。通过 XRD、SEM、TEM 及相关电
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化学性能研究，证明 Al 层间预嵌有利于扩大层间
距，扩充锌离子的扩散通道，有效提高材料的比容
量、倍率性能及循环稳定性能。Al-6NVO 材料在 0.1、
0.5、1.0、2.0 A/g 电流密度下放电比容量分别为 386、
279、238、190 mA·h/g，表现出优异的倍率性能。
在 2.0 A/g 电流密度下循环 1200 圈放电比容量仍能
保持在 122.8 mA·h/g，容量保持率高达 94.6%。实
+
3+
验表明，双阳离子 NH 4 和 Al 协同于层间形成支柱
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作用能有效提高 Zn 的扩散动力学，改善材料的电
化学性能，为制备出具有长周期循环稳定性的水系
锌离子电池正极材料提供重要思路。
参考文献：

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Al-6NVO material （下转第 336 页）