替代的晶体结构 实现离子导电率高于1mS cm-1 在经济高效的基于Zr的化物固体电解质中
Jinzhu Wang1, Fang Chen1, Lv Hu1
1Hefei National Research Center for Physical Sciences at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China.
Nano letters
|June 29, 2023
概括
一种新的低成本固体电解质,Li3Zr0.75OCl4,可以实现高离子导电性,用于实际的全固态电池. 这种材料表现出极好的稳定性,为商业应用铺平了道路.
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:
- 实用的全固态电池需要具有高离子导电率 (>1 mS cm−1 在25 °C) 和低成本 (<$ 50/kg) 的固体电解质.
- 现有的基于Zr的化物固体电解质具有成本效益,但缺乏足够的离子导电性.
- 当前的固体电解质往往无法满足导电性和成本要求,以实现商业可行性.
研究的目的:
- 开发一种新的固体电解质材料,同时满足所有固态电池的高离子导电性和低成本目标.
- 研究一种新的基于Zr的化物材料的结构性质,并将其与其离子运输能力相关联.
- 评估使用新型固体电解质的全固态电池的电化学性能和长期稳定性.
主要方法:
- 合成和描述Li3Zr0.75OCl4固体电解质的方法.
- 在25°C时测量离子导电性.
- 结晶学分析以确定材料的结构.
- 使用LiNi0.8Mn0.1Co0.1O2阴极和新型电解质制造和测试一个完全固态电池.
主要成果:
- 在25°C时为Li3Zr0.75OCl4.4的离子导电率达到1.35 mS cm−1.
- 估计材料成本为11.09美元/千克,远低于50美元/千克的目标.
- 3Zr0.75OCl4具有单临结构 (与3ScCl6具有异结构),与三元基化物相比,促进更快的离子运输.
- 在25°C和5°C的700个循环后,全固态电池显示出超过80.9%的容量保留率.
结论:
- 3Zr0.75OCl4是全固态电池的有前途的固体电解质材料,具有高离子导电性和低成本的独特组合.
- 3Zr0.75OCl4的单晶晶体结构是其增强的离子运输特性的关键.
- 证明的循环稳定性表明,下一代储能器件的实际应用潜力.
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