为设计高能和高功率全固态电池阴极设计接口阻抗的制定
Wonsung Choi1, Jun Hwan Ku1, Youngeal Kim1
1Samsung Advanced Institute of Technology, Samsung Electronics, Suwon 16678, Republic of Korea.
ACS applied materials & interfaces
|May 13, 2024
概括
全固态电池 (ASSB) 是有前途的,但低功率受到阴极界面阻抗的限制. 优化阴极设计是通过管理粒度边界和电荷转移电阻来解锁高功率ASSB的关键.
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:
- 与传统的离子电池相比,全固态电池 (ASSB) 提供了更高的安全性和能量密度.
- 然而,它们的广泛采用受到低功耗性能的阻碍,主要是由于复合材料正极内部的高界面阻抗.
研究的目的:
- 量化分析限制ASSB功率性能的界面因素.
- 阐明阴极活性物质 (CAM) 颗粒大小和界面电阻之间的关系.
主要方法:
- 使用阻抗光谱测量界面阻抗组件:粒边界电阻 (r_i,gb) 和电荷转移电阻 (r_i/e).
- 系统地改变CAM粒子大小,以调查其对正极电阻的影响.
主要成果:
- 观察到CAM粒子大小和正极电阻之间的反向关系:较小的粒子导致更高的电阻.
- 发现了一个权衡:较小的CAM粒子导致电荷转移阻力较低,但由于孔隙性增加,谷物边界阻力显著更高.
- 这种现象是特定于ASSB,而不是在液体电解质电池中观察到的.
结论:
- 复合阴极设计显著影响ASSB的性能.
- 通过战略CAM粒子工程来管理谷物边界和电荷转移阻力之间的权衡对于实现稳定,高功率和高能量的ASSB至关重要.
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