强大,耐高温聚胺分离器与垂直对齐的均纳米通道,用于高性能离子电池
Qizhong Zhang1,2,3, Linjing Chen4, Xuanlin Li1,3
1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
ACS nano
|November 5, 2024
概括
这项研究引入了离子电池的新型聚胺分离器,提供了更好的热稳定性和均的离子流. 这些先进的分离器提高了电池的安全性和性能,使周期寿命更长,工作温度更高.
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
- 电池技术 电池技术
背景情况:
- 离子电池 (LIB) 中常规的多聚烯分离器具有较差的热稳定性和不均的孔状结构.
- 这些局限性阻碍了有效预防热收缩和树增长,损害了电池的安全性和性能.
研究的目的:
- 开发一个强大的,耐高温的聚胺 (PI) 分离器与垂直对齐的纳米通道,以增强LIBs.
- 为了改善离子导电性,离子运输,以及电池的整体安全性和循环寿命.
主要方法:
- 使用离子轨道蚀刻技术制造聚胺轨道蚀刻膜 (PITEMs).
- 对于离子导电性,Li+转移数和热稳定性,PITEMs的表征.
- 在不同温度下对各种LIB配置 (Li/Li,Li/LiFePO4,石墨/LiFePO4囊细胞) 的PITEM进行电化学测试.
主要成果:
- PITEM 具有增强的离子导电性 (0.57 mS cm-1) 和高的 Li+ 转移数 (0.61).
- 显著改善Li/Li电池的周期寿命 (1200小时) 和Li/LiFePO4电池的容量保留 (83.88%在室温下300个周期后,85.92%在80°C下200个周期后).
- 带有PITEM的袋式电池显示出极好的循环稳定性 (在室温下1000个循环后73.25%的容量),并且可以在150°C下工作.
结论:
- 开发的PI分离器有效地解决了传统分离器的局限性,提供卓越的热稳定性和均的离子分布.
- PITEMs显示出提高LIBs安全性和电化学性能的巨大潜力.
- 这种制造方法适合通过卷对卷技术进行大规模生产,为先进的电池制造铺平了道路.
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