草酸浓度调控对水系锌离子电池正极材料NH4V4O10合成的优化
Optimizing NH4V4O10 Cathode Material Synthesis for Aqueous Zinc-Ion Batteries via Oxalic Acid Concentration Control
蔺何 1刘晨帆 1张禹1
作者信息
- 1. 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
- 折叠
摘要
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％.
Abstract
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.
关键词
锌离子电池/正极材料/草酸/偏钒酸铵Key words
zinc-ion batteries/cathode materials/oxalic acid/ammonium metavanadate引用本文复制引用
基金项目
National Natural Science Foundation of the People's Republic of China(22065032)
Undergraduate Education and Teaching Research and Reform Project of Universities in Xinjiang Uygur Autonomous Region(XJGXPTJG-202205)
出版年
2024
国家科技期刊平台
NSTL
万方数据