- 在金属电池中稳定SEI和CEI
Pengcheng Liu1, Hongchang Hao1, Aditya Singla2
1Materials Science and Engineering Program & Texas Materials Institute (TMI), The University of Texas at Austin, Austin, TX 78712-1591, USA.
Angewandte Chemie (International ed. in English)
|May 15, 2024
概括
氧化纳米粉在金属电池中创建人工接口,增强稳定性和导电性. 这可以防止树岩的形成和阴极裂纹,从而使电池寿命更长.
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
- 电池技术 电池技术
背景情况:
- 金属电池 (KMB) 由于接口降解而面临稳定性挑战.
- 开发稳定的固体电解质接口 (SEI) 和阴极电解质接口 (CEI) 对于KMB的性能至关重要.
研究的目的:
- 通过创建人工SEI和CEI层来提高KMB的稳定性和性能.
- 调查改分离器对KMB循环稳定性和电化学性能的影响.
主要方法:
- 在聚烯分离器上涂上氧化 (Al2O3) 纳米粉.
- 制造和测试带有修改分离器的对称KMB电池.
- 使用冷阶段聚焦离子束 (cryo-FIB) 分析进行形态表征.
- 采用大尺度建模来理解接口行为.
主要成果:
- 改性分离器显著提高了循环稳定性,对称细胞在1000个循环后稳定.
- 观察到增强的电解质湿透,离子导电率 (0.59对0.2毫秒/厘米) 和转移数 (0.81对0.23).
- 化FIB分析显示,修改过的阳极上有密集的平面电沉积物,抑制了树突的形成.
- 改造的CEI减少了普鲁士蓝 (PB) 阴极中的铁交叉和阴极裂纹.
结论:
- 使用纳米粉制成的人工SEI和CEI有效地提高了KMB的稳定性和性能.
- 胺修饰提供了一个有前途的策略,以克服金属电池技术的关键局限性.
- 中尺度建模支持人工SEI在改善电流分布和形态稳定性方面的作用.
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