新型的稀土酸盐固体电解质,具有超耐用固态金属电池的粒度边界电子绝缘
Nengbin Cai1, Busheng Zhang1, Yameng Fan2
1Beijing Advanced Innovation Center for Materials Genome Engineering, School of Advanced Materials Innovation, University of Science and Technology Beijing, Beijing, 100083, China.
Advanced materials (Deerfield Beach, Fla.)
|October 7, 2025
概括
在Na5YSi4O12固体电解质中引入Na1.5Y2.5F9第二阶段,可以防止树的生长. 这提高了固态金属电池的性能和耐用性.
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:
- 稀土酸盐是固态金属电池 (SSSMB) 的有前途的固体电解质 (SE),由于其高离子导电性,低烧结温度和稳定性.
- 颗粒边界杂质和SEs中的空隙阻碍了离子导电,促进了树的生长,限制了电池的性能.
研究的目的:
- 为Na5YSi4O12固体电解质制定一个粒度边界修改策略.
- 提高SE的离子导电性,密度和机械强度.
- 为了抑制树状石的形成,并提高SSSMBs的循环寿命.
主要方法:
- 通过将Na1.5Y2.5F9作为第二阶段引入到Na5YSi4O12的粒度边界中,采用了简单的粒度边界修改策略.
- 使用Na/Na对称细胞和全细胞来评估电化学性能.
- 测量了关键电流密度,循环寿命,容量保留和速率能力.
主要成果:
- Na1.5Y2.5F9阶段有效地阻碍了电子迁移,并降低了散体和颗粒边界电阻.
- 观察到SE的增强密度和机械强度.
- Na/Na对称细胞显示了0.7 mA cm-2的临界电流密度和在0.1 mA cm-2下9000小时的循环寿命,没有树突形成.
- 完整电池在1°C的750个周期和2°C的113.5 mAh g-1后实现了70.2%的容量保留.
结论:
- 用Na1.5Y2.5F9修改粒度边界是一种可行的策略,可以提高稀土酸盐固体电解质的性能.
- 这种方法有效地抑制了树状石的形成,导致了超耐用的SSSMBs.
- 这些发现为开发下一代电池的高性能SE提供了基础.
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