聚胺介导质子/TFSI双捕获使基于高压PEO的全固态Li电池成为可能
You Fan1, Mingli Zhu1, Huicai Wang1
1College of Chemical Engineering, Fuzhou University, Fuzhou, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|January 14, 2026
概括
一种新型聚胺剂有效捕获质子和TFSI离子,防止高压全固态电池 (ASSLB) 的降解,并提高其稳定性和能量密度.
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:
- 在全固态电池 (ASSLBs) 中,基于聚乙烯氧化物 (PEO) 的固体聚合物电解质 (SPEs) 在高电压 (>3.8 V vs. Li+/Li) 下降解.
- 这种降解是由腐蚀性酸引起的,主要是二三甲硫尼尔) 胺 (HTFSI),限制了ASSLB的能量密度.
- 目前的被动策略未能有效地抑制HTFSI生成.
研究的目的:
- 制定一个积极的战略,以减轻高压ASSLB的退化.
- 在PEO矩阵内抑制腐蚀性酸 (HTFSI) 的形成.
- 提高ASSLBs的循环稳定性和能量密度.
主要方法:
- 一种聚胺基剂被设计用于双捕获质子 (H+) 和TFSI-离子.
- 该代理利用布伦斯特德基位和H键捐赠者进行静电和H键相互作用.
- 该剂被用于4.2V的基于LiCoO2的ASSLB中.
主要成果:
- 聚胺剂有效地捕获了H+和TFSI-离子,抑制了HTFSI的形成.
- 使用该剂的ASSLB显示出异常的循环稳定性 (>600个周期在1.0°C,65°C).
- 实现了95.5%的容量保留,优于现有的高压聚合物基ASSLB.
结论:
- 双捕获主动策略有效地减轻了高压ASSLB的接口和散装降解.
- 这种方法在PEO矩阵中显著抑制了酸催化链裂变.
- 这些发现为设计高能量密度ASSLB提供了新的见解.
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