固体电解质双模粒粒结构,改善循环性能
Zhanhui Jia1, Hao Shen1, Jiawei Kou1
1Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China.
Advanced materials (Deerfield Beach, Fla.)
|January 23, 2024
概括
在固态电解质中使用双模粒微结构的新"绕道和缓冲"策略可以防止树短路. 这使得电池的电流密度更高,性能更好.
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
- 固态化学 固态化学
背景情况:
- 树状石的形成会导致固态电解质的短路,从而限制电池的性能.
- 控制陶电解质中的粒径大小和孔隙分布,如Li$_{7}$La$_{3}$Zr$_{2}$O$_{12}$对于缓解树的生长至关重要.
研究的目的:
- 提出和验证固态电解质的"绕道和缓冲"战略.
- 通过结合粗粒和细粒来优化微观结构以提高电池性能.
主要方法:
- 通过播种未粉碎的颗粒来制造粗细双模粒微观结构.
- 调颗粒和孔隙通过不同的粉末比重重新排列.
- 尸检后的分析证实了"绕道和缓冲"机制.
主要成果:
- 实现了优化的双模微结构 (粗粉和细粉的均混合物).
- 优化的电解质在增加电流密度 (1.0到2.0mA·cm$^{-2}$) 的情况下循环超过2000小时.
- 细粒制造了复杂的边界,阻碍了Li的透;粗粒增加了Li路径的曲率.
结论:
- "绕道和缓冲"策略有效地抑制了多晶固态电解质中的树突.
- 微结构优化是提高固态电池性能和安全性的关键.
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