通过替代离子替代阴离子集群来提高反矿固体电解质的离子导电性
Lei Gao1, Xinyu Zhang2, Jinlong Zhu2
1School of Materials Science and Engineering, Peking University, 100871, Beijing, China.
Nature communications
|October 26, 2023
概括
研究人员通过在抗矿材料中用离子取代氧化集群来增强固态电解质导电性. 这种格子操纵可以提高离子导电性,从而实现更安全,更高性能的全固态电池.
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:
- 固态电解质的高离子导电性对于推进全固态电池至关重要.
- 离子导电性与固态电解质的晶格结构密切相关.
研究的目的:
- 为了研究晶格操纵对抗矿固态电解质的离子导电性的影响.
- 探索离子替代在增强离子运输方面的潜力.
主要方法:
- 通过替代[Li2OH]+集群的离子,合成了一种改性反矿固态电解质, (Li2OH) 0.99K0.01Cl.
- 进行机械分析以了解晶体结构的变化,离子轨迹和迁移障碍.
- 制造并测试了一种使用修改过的电解质的全固态LiFePO4电池.
主要成果:
- 在25°C时实现了离子导电率的显著增加,达到4.5 × 10‒3 mS cm‒1.
- 在反矿结构中观察到立方相和格子收缩的稳定.
- 在第150个循环中表现出116.4mAhg-1的特定容量,在全固态电池中保持96.1%的容量.
结论:
- 通过离子替代进行晶格操纵是一种有效的策略,可以增强抗矿固态电解质中的离子导电性.
- 修改后的电解质在高性能全固态电池中的实际应用方面表现有前途.
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