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在有缺陷的瓦纳酸盐中固定极地有机分子,用于高性能灵活的水性离子电池
Shuo Kong1, Yuxin Li1, Xiaojie Zhang1
1College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 211816, China.
Small (Weinheim an der Bergstrasse, Germany)
|August 31, 2023
概括
这项研究引入了一种新型的正极材料,N,N-二甲基形式胺交氨基瓦纳酸盐 (DMF-NVO) 在碳布上的纳米片阵列,显著提高了柔性水性可充电离子电池 (FARZIB) 的电化学性能. 该材料表现出优越的容量和能量密度,为先进的电池设计提供了一个有前途的方向.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 瓦纳酸 (NVO) 由于不可逆转的离子 (NH4+) 去除,其电化学性能有限.
- 现有的阴极材料往往在以为基础的电池中扎着结构稳定性和离子扩散限制.
研究的目的:
- 为灵活的水性可充电离子电池 (FARZIBs) 开发高性能阴极材料.
- 改进基于氨瓦纳酸盐的阴极的电化学稳定性和离子间歇性质.
主要方法:
- 在碳布 (CC) 上合成层层的N,N-二甲基形式胺-联氨瓦纳酸盐 (DMF-NVO) 纳米片阵列.
- DMF-NVO NFA/CC//Zn电池的制造和电化学测试.
- 密度函数理论 (DFT) 模拟来分析离子扩散和电子性质.
主要成果:
- 通过DMF间隔,层间间距扩大到12.6 Å,提高了Zn2+的可访问性,并稳定了格子.
- DMF-NVO NFAs/CC 阴极在 0.5 A g-1 时实现了 536 mAh g-1 的高容量,具有出色的速率能力和循环稳定性.
- 组装后的FARZIB显示出出色的能量密度 (436 Wh kg-1 在400 W kg-1) 和功率密度.
结论:
- 在FARZIBs中,DMF间隔是一种有效的策略,可以提高氨瓦纳酸盐阴极的电化学性能.
- 开发的DMF-NVO NFA/CC材料为高性能,灵活的储能设备提供了一个有希望的途径.
- 这项研究为设计下一代离子电池的先进阴极材料提供了宝贵的见解.
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