首页|草酸浓度调控对水系锌离子电池正极材料NH4V4O10合成的优化

草酸浓度调控对水系锌离子电池正极材料NH4V4O10合成的优化

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采用一步水热法,调整不同的草酸含量制备了NH4V4O10(NVO)样品,并研究其作为水系锌离子电池正极材料的电化学性能.实验发现:草酸的浓度在决定样品组成上起到了关键性作用.当浓度较低时,得到NVO和(NH4)2V4O9的混合相;草酸浓度过高则会导致VO2的生成.当偏钒酸铵与草酸的摩尔比保持在1∶1时,成功合成了纯相NVO.电化学测试结果表明:纯相NVO在0.2 A·g-1的电流密度下,比容量达到了479.3 mAh·g-1,性能显著优于其它样品.此外,该材料在0.1 mV·s-1的扫描速率下,赝电容贡献率高达82.48％.
Optimizing NH4V4O10 Cathode Material Synthesis for Aqueous Zinc-Ion Batteries via Oxalic Acid Concentration Control
Using one-step hydrothermal method and adjusting the content of oxalic acid,NH4V4O10(NVO)samples were prepared,and their electrochemical properties as potential cathode materials for aqueous zinc-ion batteries were studied.The concentration of oxalic acid played a pivotal role in determining the resultant phase of the product.At lower concentrations,a mix of NVO and(NH4)2V4O9 phases emerged,while an excess of oxalic acid led to the formation of VO2.A balanced ammonium metavanadate and oxalic acid ratio of 1∶1 produced a pure NVO phase.Electrochemical analyses highlighted that this single-phase NVO demonstrated a remarkable specific capacity of 479.3 mAh·g-1 at 0.2 A·g-1,outperforming other compositions.Moreover,the material showcased a high pseudo capacitive contribution rate of 82.48％at 0.1 mV·s-1.

zinc-ion batteriescathode materialsoxalic acidammonium metavanadate

蔺何、刘晨帆、张禹

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新疆大学化学学院省部共建碳基能源资源化学与利用国家重点实验室,新疆乌鲁木齐 830017

锌离子电池 正极材料 草酸 偏钒酸铵

National Natural Science Foundation of the People's Republic of ChinaUndergraduate Education and Teaching Research and Reform Project of Universities in Xinjiang Uygur Autonomous Region

22065032XJGXPTJG-202205

2024

10.13568/j.cnki.651094.651316.2023.10.03.0002

新疆大学学报(自然科学版)(中英文)
新疆大学

新疆大学学报(自然科学版)(中英文)

CSTPCD
影响因子：0.13
ISSN：2096-7675
年,卷(期)：2024.41(4)
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