在现场聚合聚化聚化交联聚乙烯电解质用于高压金属电池
Shimei Li1,2, Hu Hong1, Xinru Yang1
1Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong SAR, 999077, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|May 3, 2025
概括
一种新型的多化交联聚乙烯电解质 (PDOL-OFHDBO) 通过防止树突的生长和提高稳定性来提高固态金属电池的安全性和性能. 这使得具有更长周期寿命的高能量密度电池成为可能.
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
- 聚合物化学 聚合物化学
背景情况:
- 在现场聚合聚乙烯电解质对于固态金属电池至关重要,提供高离子导电性和良好的接口接触.
- 关键的挑战包括树状石的形成,界面降解和有限的氧化稳定性,阻碍了实际的电池应用.
研究的目的:
- 开发一种新型的多化交联聚乙烯电解质 (PDOL-OFHDBO),用于增强的固态金属电池.
- 为了提高氧化稳定性,界面兼容性和沉积均性.
主要方法:
- 合成PDOL-OFHDBO通过1,3-二氧化 (DOL) 和2,2'-,2,3,4,4,5,5-八化-1,6-二) 二) 氧化 (OFHDBO) 的共聚合.
- 评估了电化学稳定性窗口,涂/剥离性能,以及在底NCM811全电池中的循环稳定性.
- 经过测试的Ah-level Li下载DCNCM811袋式电池,用于特定的能量.
主要成果:
- PDOL-OFHDBO 具有增强的氧化稳定性 (>5.6 V) 和由于吸收电子的多基组而提高的界面兼容性.
- 经过1100多小时的稳定涂/剥离,在充满电池的高负荷阴极和薄阳极中具有出色的循环稳定性.
- 在袋式电池中实现了高容量保留 (95.5%在4.3V,89.1%在4.5V) 和令人印象深刻的401.8Wh kg-1的特定能量.
结论:
- 多化交联聚乙烯电解质有效抑制树突,提高电池性能.
- PDOL-OFHDBO显示了实用,高能量密度的固态金属电池的巨大潜力.
- 开发的电解质为下一代储能解决方案提供了一个有前途的途径.
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