A new type of LATP doped PVDF-HFP based electrolyte membrane with flame retardancy and long cycle stability for solid state batteries

IF 8.9 2区 工程技术 Q1 ENERGY & FUELS
Tianyu Zhao , Qixin Gai , Xiaoyan Deng , Junwei Ma , Hongtao Gao
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引用次数: 2

Abstract

Lithium ion batteries are a widely used high-density energy storage device due to their low self-discharge rate and lack of memory effect. However, their use in liquid electrolyte systems poses a significant safety risk due to issues such as lithium dendrite growth and toxic electrolytes that are also prone to leakage. Therefore, the development of gel polymer electrolytes (GPE) with high ionic conductivity and elevated lithium ion migration numbers is crucial to addressing these concerns. This work focuses on the preparation of flexible microporous composite gel polymer electrolytes (L-GPE) based on Polyvinylidene fluoride-Hexafluoropropylene (PVDF-HFP) and Li1.3Al0.3Ti1.7P3O12 (LATP) as a filler and on testing its performance as an electrolyte in applications of lithium ion battery. The L-GPE demonstrated an ionic conductivity of 8.13 × 10−4 S·cm−1 at 40 °C, with a lithium ion mobility number of 0.58, indicating high ionic mobility. Notably, in all-solid-state lithium ion battery applications, the L-GPE demonstrated excellent long-cycle stability, with a capacity retention of 90.3 % after 1000 cycles at 0.5C. These results demonstrate that the interaction force between LATP and anions enhances lithium ion mobility in composite gel polymer electrolytes, which is favorable for the regulation of lithium ion deposition and the control of lithium dendrite growth. Besides, the performance of this L-GPE membrane is significantly improved due to its suitable porosity, gratifying mechanical properties, and excellent flame retardancy. In summary, this strategy provides a valuable contribution to the development of safe and long-lasting energy storage systems by presenting a novel L-GPE membrane with enhanced mechanical, high ionic conductivity, excellent flame retardant property and thermal stability.

一种新型阻燃长循环稳定的固态电池电解质膜
锂离子电池具有自放电率低、无记忆效应等优点,是一种广泛应用的高密度储能器件。然而,由于锂枝晶生长和有毒电解质也容易泄漏等问题,它们在液体电解质系统中的使用存在重大的安全风险。因此,开发具有高离子电导率和高锂离子迁移数的凝胶聚合物电解质(GPE)对于解决这些问题至关重要。本文主要研究了以聚偏氟乙烯-六氟丙烯(PVDF-HFP)和Li1.3Al0.3Ti1.7P3O12 (LATP)为填料制备柔性微孔复合凝胶聚合物电解质(L-GPE),并测试了其作为电解质在锂离子电池中的应用性能。在40°C时,L-GPE的离子电导率为8.13 × 10−4 S·cm−1,锂离子迁移率为0.58,表明离子迁移率较高。值得注意的是,在全固态锂离子电池应用中,L-GPE表现出了出色的长周期稳定性,在0.5℃下循环1000次后,容量保持率为90.3%。这些结果表明,LATP与阴离子的相互作用力增强了复合凝胶聚合物电解质中锂离子的迁移率,有利于锂离子沉积的调控和锂枝晶生长的控制。此外,该L-GPE膜具有合适的孔隙率,令人满意的力学性能和优异的阻燃性,显著提高了性能。总之,该策略提供了一种新型的L-GPE膜,具有增强的机械性能,高离子电导率,优异的阻燃性能和热稳定性,为开发安全和持久的储能系统做出了有价值的贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of energy storage
Journal of energy storage Energy-Renewable Energy, Sustainability and the Environment
CiteScore
11.80
自引率
24.50%
发文量
2262
审稿时长
69 days
期刊介绍: Journal of energy storage focusses on all aspects of energy storage, in particular systems integration, electric grid integration, modelling and analysis, novel energy storage technologies, sizing and management strategies, business models for operation of storage systems and energy storage developments worldwide.
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