构建一个离子捕获接口,以实现 Li+ 跨相传输在复合固体电解质中.
Jian Lan1, Ying Zhong1, Hao Peng1
1State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China.
Nature communications
|December 11, 2025
概括
研究人员开发了一种使用FeF3在固体电解质上捕获离子的接口,以改善固态金属电池中的离子导电性. 这种接口工程提高了离子运输和电池性能.
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:
- 固态金属电池提供了更高的安全性,但由于固体电解质的低离子导电性而受到限制.
- 充电的接口和度梯度阻碍了离子 (Li+) 运输和电池性能.
研究的目的:
- 在固体电解质上设计一个离子捕获接口,以提高Li +导电性和电池性能.
- 为了解决固态金属电池的接口挑战.
主要方法:
- 使用sol-gel方法在Li6.5La3Zr1.5Ta0.5O12 (LLTO) 固体电解质表面上创建基于FeF3的离子捕获接口.
- 复合体固体电解质是通过将修改后的LLTO与聚合物结合而制造的.
主要成果:
- FeF3接口促进了Li-盐分离,并促进了Li+迁移,降低了接口电阻.
- 复合体固体电解质的离子导电率为1.1×10-4 S/cm2和Li+转移数为0.75.
- 对称电池在1300多小时的低极化过程中表现出稳定的涂/剥离.
- 带有LiFePO4阴极的固态电池在1.0°C时表现出152.8mAh/g的特定容量,在600个循环后保持96%的电容.
结论:
- 采用离子捕获FeF3的接口工程是克服固体电解质接口限制的有希望的策略.
- 开发的复合体固体电解质显示出高性能固态金属电池的潜力.
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