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perfluoropolyether终结的单离子聚合物用于提高基于PEO的固体聚合物电解质的性能

Tianyi Wang¹, Yuxiang Guo², Kailiang Ren¹

¹Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, 710072, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|November 11, 2024

概括

一种新型的 perfluoropolyether 终结的单离子聚合物增强了金属电池的固态电解质. 这种新材料改善了离子转移和电化学稳定性,使电池性能和安全性更好.

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:

固态电解质对于高能量密度的金属电池至关重要.
基于聚乙烯氧化物 (PEO) 的电解质具有局限性,包括低离子转移和低高压稳定性.
这些局限性阻碍了PEO在先进的金属电池中的实际应用.

研究的目的:

设计和合成一种新的完聚乙烯终结型单离子聚合物 (PFPE聚合物).
通过将PFPE聚合物纳入PEO,为金属电池开发一种改进的聚合物电解质 (PFPE-SE).
在离子转移,电化学窗口和循环稳定性方面评估PFPE-SE电解质的性能.

主要方法:

一种完全聚乙烯终结的单离子聚合物 (PFPE聚合物) 的合成.
制备聚合物电解质 (PFPE-SE) 通过将PFPE-聚合物和LiTFSI通过造将PEO纳入.
描述PFPE-SE电解质的特性,包括离子转移数,电化学窗口和固体电解质接口 (SEI) 的形成.
电化学测试Li PaddyPFPE-SE PaddyLFP电池以评估容量,循环稳定性和树突抑制.

主要成果:

PFPE-SE电解质成功地形成了固体电解质接口 (SEI) 层,抑制了树的生长.
在70°C时达到0.72的高离子转移数和4.7V的电化学窗口.
李达人PFPE-SE达人LFP电池在0.5°C的放电速度下表现出156.0mAhg-1的特定容量.
与PEO-LiTFSI电解质相比,在230个循环后表现出优异的循环性能,容量保持率为74.3%.

结论:

开发的PFPE-SE是高性能金属电池的有希望的聚合物电解质.
现场SEI形成和单离子导电有助于提高电池的安全性和效率.
这一战略为推进金属电池技术提供了可行的途径.

关键词:

高转移数电解质的电解质.高性能的金属电池是高性能金属电池.在现场固体电解质接口形成.单离子聚合物是一种单离子聚合物.

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