揭示了超快速烧结的LLZO固态电解质的表面化学性质,用于高性能石榴石固态电池
Huanyu Zhang1,2, Matthias Klimpel1,2, Krzysztof Wieczerzak3
1Laboratory for Thin Films and Photovoltaics, Empa-Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.
Chemistry of materials : a publication of the American Chemical Society
|December 2, 2024
概括
-石榴石固态电解质的超快速烧结会造成表面污染. 额外的热处理有效地去除了这种Li2O杂质,提高了电池的性能.
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:
- 超快速 (UF) 烧结对于制造-石榴石固态电解质,如Li7La3Zr2O12 (LLZO) 至关重要.
- 用UF烧结的LLZO的表面化学性质在很大程度上仍然没有特征,这可能会影响固态电池的性能.
- 推进花固态电池需要了解和优化LLZO制造工艺.
研究的目的:
- 为了研究UF烧结LLZO的表面化学.
- 将UF烧结的LLZO与传统烧结的LLZO表面进行比较.
- 为了改善电池应用,识别和解决用UF炼的LLZO表面污染问题.
主要方法:
- 深度分析的X射线光电子谱学 (XPS).
- 聚焦离子束飞行时间二次离子质谱 (FIB-TOF-SIMS).
- 在烧结过程中同步射线X射线衍射 (XRD).
主要成果:
- 用UF烧结的LLZO表现出相当大的Li2O表面污染,直至~40nm深度.
- 比较XRD揭示了UF加工过程中表面污染的来源.
- 在900°C的额外热处理 (HT) 有效地消除了Li2O污染.
结论:
- 对LLZO的UF烧结导致了有害的Li2O表面污染.
- 烧结后的热处理是一种可行的方法,可以实现清洁的LLZO表面.
- 没有污染的LLZO表面对于固态电池的最佳电化学性能至关重要.
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