单离子聚合物电解质基于丰富的伊米达阳性多孔芳香框架,用于高性能离子电池
Zhangnan Li1, Liying Wang1, Yuhan Liu1
1Faculty of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|June 7, 2023
概括
研究人员开发了一种新的单离子材料,多孔芳香框架-220- (PAF-220-Li),以增强离子电池的固体聚合物电解质. 这项创新显著提高了离子电导率和稳定性,为更安全,更高效的电池铺平了道路.
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
- 聚合物化学 聚合物化学
背景情况:
- 固体聚合物电解质 (SPEs) 具有较低的离子导电性和离子 (Li+) 转移数,限制了它们在离子电池 (LIB) 中的使用.
- 现有的SPE经常表现出高的Li+结合力和度极化,阻碍了电池的性能和安全性.
研究的目的:
- 设计和合成一个新的单离子丰富的imidazole anionic多孔芳香框架 (PAF-220-Li) 用于先进的SPEs.
- 调查PAF-220-Li对Li+转移,度极化和LIBs中的树抑制的影响.
主要方法:
- 合成PAF-220-Li具有丰富的孔隙和较低的Li+结合能量,由于伊米达和环结合.
- 使用PAF-220-Li,LiTFSI和PVDF-HFP制造半固体聚合物电解质 (PAF-220-QSPE) 和全固体聚合物电解质 (PAF-220-ASPE).
- 电化学特性包括离子导电性,Li+转移数和Li//PAF-220-ASPE//LFP电池的循环性能.
主要成果:
- 该PAF-220-ASPE具有0.501 mS cm-1的高Li+导电性和0.93.3的Li+转移数 (tLi+).
- 该Li//PAF-220-ASPE//LFP电池在0.2°C时表现出164mAhg-1的排放特定容量,并在180个循环后保持90%的容量.
- 由于PAF-220-Li的单离子性质,有效地减少了度极化,并抑制了树的生长.
结论:
- 开发的单离子多孔芳框架战略为先进的离子电池提供了一条有前途的途径,用于高性能固体聚合物电解质.
- 基于PAF-220-Li的SPE显示出更安全,更高效和更稳定的固态LIB的巨大潜力.
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