首页|刚柔并济的仿生凝胶聚合物电解质助力稳定的锂电池

刚柔并济的仿生凝胶聚合物电解质助力稳定的锂电池

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凝胶聚合物电解质(GPE)因其优良的热稳定性和卓越的电化学性能而具备增强锂离子电池性能的潜力,从而受到越来越多的认可.尽管其具有上述优点,但传统GPE的实际应用通常因其溶胀性和有限的机械强度而受到阻碍.为了解决这些问题,本项研究工作提出了一种通过简单方法构建的刚柔并济的仿生GPE,由聚环氧乙烷(PEO)和聚偏二氟乙烯-六氟丙烯(PVDF-HFP)组成并通过Kevlar纤维织物进行增强.所得的PEO/PVDF-HFP/Kevlar(PPK)GPE表现出2.815 mS cm-1 的优异离子电导率和0.571的锂离子迁移数,以及32.59 MPa的超高机械强度.这些特性有助于防止锂枝晶生长并增强LiFePO4电池的电化学性能,从而实现稳定的循环性能.PPK GPE可以为高性能锂离子电池的各种实际应用提供理论基础.
Bio-inspired rigid-soft coupling gel polymer electrolyte for stable lithium batteries
Gel polymer electrolytes(GPEs)are increasingly recognized for their potential to enhance lithium(Li)-ion batteries owing to their exceptional thermal stability and re-markable electrochemical performance.Despite these ad-vantages,the practical application of traditional GPEs is hindered by their tendency to swell and their limited me-chanical strength.To address these issues,this study in-troduces a bio-inspired rigid-soft coupling GPE comprising polyethylene oxide(PEO)and poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP),reinforced with Kevlar fiber fabric fabricated using a simple solution-casting method.The resulting PEO/PVDF-HFP/Kevlar(PPK)GPE demon-strates excellent ionic conductivity of 2.815 mS cm-1 and a Li-ion migration number of 0.571,alongside an ultra-high me-chanical strength of 32.59 MPa.These features collectively contribute to the prevention of lithium dendrite growth and enhanced electrochemical performance of LiFePO4 cells,leading to stable cycling performance.The deployment of PPK GPE can pave the way for significant advancements in high-performance Li-ion batteries for various practical applica-tions.

gel polymer electrolytepolyethylene oxide(PEO)poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)Kevlar fibercartilage structure

周天易、徐若晨、曹曦、张江涛、王佳运、黄茹玲、平小凡、白盼星、孙周婷、刘明义、王晓龙

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Huaneng Clean Energy Research Institute,Beijing 102209,China

gel polymer electrolyte polyethylene oxide(PEO) poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP) Kevlar fiber cartilage structure

Huaneng Clean Energy Research Institute Found Project

CERI/TU-23-CERI01

2024

10.1007/s40843-023-2926-8

中国科学:材料科学(英文)

中国科学:材料科学(英文)

CSTPCD
ISSN：
年,卷(期)：2024.67(7)
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