通过独特的功能性聚合物用于稳定的高压金属电池的工程Janus接口
Jia-Yan Liang1,2, Xian-Xiang Zeng3, Xu-Dong Zhang1
1CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, CAS Research/Education Center for Excellence in Molecular Sciences, Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences (CAS) , Beijing 100190 , People's Republic of China.
Journal of the American Chemical Society
|May 30, 2019
概括
这项研究通过用聚烯 (PAN) 和聚乙烯氧化物 (PEO) 涂覆Li1.4Al0.4Ti1.6(PO4)3 (LATP) 来开发高能金属电池的陶电解质. 这种设计提高了稳定性,并降低了接口阻力,从而提高了电池性能.
科学领域:
- 材料科学
- 电化学
- 固态电池
背景情况:
- 快速导离子陶电解质对于高能量密度的金属电池至关重要.
- 挑战包括高界面电阻和差界面稳定性,阻碍实际应用.
- 现有的固态电解质经常面临电压耐受性和阳极兼容性的问题.
研究的目的:
- 为金属电池设计一个兼容的固态电解质.
- 解决陶电解质和电池组件之间的界面问题.
- 提高固态金属电池的整体稳定性,效率和安全性.
主要方法:
- 涂层 Li1.4Al0.4Ti1.6(PO4) 3 (LATP) 陶电解质与聚烯 (PAN) 和聚乙烯氧化物 (PEO) 在相反的侧面.
- 使用 PAN 与 LiNi0.6Mn0.2Co0.2O2阴极进行软接触.
- 使用PEO保护LATP免受降低并确保高压耐受性.
- 进行COMSOL多物理模拟以分析离子分布和空间电荷层的形成.
主要成果:
- 双功能涂层成功降低了接口阻力并提高了接口稳定性.
- 经过修改的电解质表现出高压耐受性和对金属阳极的增强稳定性.
- 模拟证实了同质的离子分布和抑制空间电荷层的形成.
- 实现了极好的循环稳定性 (89%在120个循环后) 和高库伦比效率 (>99.5%每个循环).
结论:
- 双功能改性陶电解质整合了PAN和PEO的优势,使其具有卓越的性能.
- 这种方法可以在60°C下实现无树的阳极和出色的电池循环.
- 代表了实际固体电池系统的陶接口工程的重大进步.
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