暂时的Ruddlesden-Popper类型缺陷及其对谷物生长的影响以及酸酸固体电解质的特性
Petruša Borštnar1,2, Goran Dražić3, Martin Šala4
1Advanced Materials Department, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia.
ACS nano
|April 9, 2024
概括
这项研究提出了一种新的自我种植的谷物生长方法,用于制造粗粒 lanthanum titanate (LLTO) 陶,这对于通过减少谷物边界限制来提高全固态电池性能至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 电化学 电化学 电化学
背景情况:
- lanthanum titanate (LLTO) 是所有固态电池的一个有前途的固体电解质.
- 在LLTO陶中,粒度边界 (GB) 限制了离子导电性.
- 通过粗粒度结构减少GB分数是提高电池性能的关键.
研究的目的:
- 开发一种用于粗粒度LLTO陶的替代制造方法.
- 在LLTO中研究微观结构演化和谷物生长机制.
- 为了将微观结构与离子导电性相关联.
主要方法:
- 合成具有高Li过剩的LLTO陶 (Li:La:Ti = 11:15:25).
- 使用像HAADF-STEM这样的技术进行微结构分析.
- 理论计算以了解相位形成能量学.
- 测量总的离子导电性.
主要成果:
- 确定了一种自我播种的谷物生长机制,从一个分层的RP型Li2La2Ti3O10阶段开始.
- 最初形成的RP阶段的大型血小板状颗粒 (厚度高达10微米,长度>100微米).
- LLTO矿在RP血小板上表层结晶,然后通过Ostwald成熟在更高的温度下再结晶为无缺陷的LLTO.
- 实现了粗粒度的LLTO,其总离子导电率为~1 × 10^-4 S/cm.
结论:
- 自播种的谷物生长方法有效地生产粗粒度的LLTO陶.
- 了解RP阶段形成和转换对于控制LLTO微观结构至关重要.
- 开发的方法为固态电池的LLTO电解质提供了增强的途径.
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