工程Mn空隙以提高层状酸盐中的离子动力学,以获得高能量和持久的间隙伪电容
Min Wang1, Hui Wang1, Qicheng Zhang2
1School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
ACS nano
|August 30, 2024
概括
在过渡金属酸盐中引入空缺可以显著提高离子扩散和能量储存. 这项创新提高了先进伪电容器的性能和寿命.
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:
- 过渡金属酸盐 (TMSs) 由于其高容量和稳定性,对水性金属离子间伪电容器具有前景.
- 然而,有限的层间距离和惰性基底平面阻碍了离子和电荷转移,影响了性能.
研究的目的:
- 通过引入空位,增强离子 (K+) 扩散和能量储存在层层的酸盐 (M2-S@FA) 中.
- 调查K+间隙伪电容的机制和空缺的作用,以改善电化学性质.
主要方法:
- 合成的M2-S@FA与丰富的Mn空缺.
- 在现场表征,观察K+间隔过程中的结构和价值变化.
- 理论计算 (例如,DFT) 和电化学评估 (例如,循环电压测量,静电电荷-放电).
- 制造和测试一个水性不对称的固态电池.
主要成果:
- 的空缺成功加速了K+的扩散,并提高了电荷储存能力.
- 现场研究证实了K+间隙假电容性,具有结构和价值状态的变化.
- 理论和实验数据强调了空缺的作用在增加层间距离和激活基底平面以改善动力学.
- M2-S@FA 阴极表现出极好的能量密度 (144.08 Wh kg-1) 和功率密度 (375.80 W kg-1).
- 固态电池表现出了显著的稳定性,在10,000个循环后保持了100%的容量.
结论:
- 引入Mn空缺是一个有效的策略,以克服K+存储TMS的局限性.
- 空白增强K+扩散,电子转移,并提供额外的存储位置,从而提高能量存储性能.
- 这种方法为设计高性能,稳定的间隙伪电容器提供了一个新的范式.
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