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准凝聚合物电解质通过溶剂膨胀的聚乙烯氧化物与电极接口,用于高性能/离子电池

Mohana Priya Babu^1,2, Sahana B Moodakare³, Raman Vedarajan³

¹Clean Energy Lab, Department of Chemistry, Indian Institute of Technology (IIT) Madras, Chennai, Tamil Nadu 600036, India.

ACS applied materials & interfaces

|August 15, 2024

概括

研究人员开发了一种新的准凝聚合物电解质 (QGPE),用于更安全的离子电池 (LIB). 这种QGPE增强了离子导电性和界面稳定性,克服了固体聚合物电解质的关键挑战.

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
聚合物科学聚合物科学

背景情况:

固体聚合物电解质 (SPEs) 与离子电池 (LIB) 中的液体电解质相比,提供了增强的安全性.
SPEs面临的挑战包括低室温离子导电性和高界面电阻.
不充分的接口接触阻碍了高效的离子流和电池性能.

研究的目的:

设计一种准凝聚合物电解质 (QGPE),解决传统 SPEs 的局限性.
为了实现LIB应用所需的机械强度,离子导电性和接口稳定性.
为了提高离子电池的安全性和性能.

主要方法:

一种准凝聚合物电解质 (QGPE) 用聚乙烯化物-联合化 (PVDF-HFP),聚乙烯氧化物 (PEO) 和糖 (SN) 的混合物合成.
溶液造技术用于制备电解质.
使用Li/QGPE/Li对称细胞和Li/QGPE/LiFePO4全细胞评估了电化学性能,包括导电性,转移数,循环稳定性和速率能力测试.

主要成果:

优化的QGPE显示离子导电率为1.14 × 10^-3 S cm^-1和转移数为0.7在25°C.
/QGPE/对称细胞显示稳定的涂/剥离超过1300小时与低电压偏振 (~20mV).
/QGPE/LiFePO4全电池在0.1°C的200个循环中实现了148mAhg-1的特异性放电容量,具有良好的速率能力和长期循环性能.

结论:

开发的QGPE有效地降低了接口电阻,并通过化PEO层确保了均的离子流量.
QGPE表现出卓越的电化学性能,包括高离子导电性,稳定性和可逆性,适合LIBs.
一个大规模的袋式电池展示了QGPE的实用性,灵活性和滥用耐受性,证明了它对先进电池技术的潜力.

关键词:

对于PEO来说,这是一个很好的选择.在PVDF-HFP中使用.凝聚合物的电解质凝.袋子细胞袋子细胞固态电池固态电池

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