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首页> 外文期刊>International Journal of Electrochemical Science >High Temperature Applicable Separator by Using Polyimide aerogel/polyethylene Double-Layer Composite Membrane for High-Safety Lithium Ion Battery
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High Temperature Applicable Separator by Using Polyimide aerogel/polyethylene Double-Layer Composite Membrane for High-Safety Lithium Ion Battery

机译：高安全性锂离子电池用聚酰亚胺气凝胶/聚乙烯双层复合膜高温适用隔膜

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摘要

To address the vulnerability of a conventional separator to high temperature, a new double-layerfunction of separator with a double-layer function is suggested for high-safety lithium-ion batteries thatare used in harsh condition. The new composite separator was fabricated by coating thermally imidizedpolyimide aerogel (PIA) on a porous polyethylene (PE) membrane, with polyvinylidene fluoride(PVDF) as a binder, to improve the thermal stability of the separator. The PIA/PE double-layercomposite performed very well, especially in terms of thermal stability. The newly suggested separatorshowed a near-zero thermal shrinkage rate compared to commercial PE separators, which are defectivein having high levels of the same, and retained its structure up to 140 °C. The PIA supporting layershowed hardly any change after heat treatment, and the PE layer performed its role as a shut-downlayer perfectly, ensuring the safety of the new separator. These results prove that a PIA/PE separatorcan prevent batteries from exploding and overcharging. In addition, the PIA/PE separator alsodemonstrated excellent electrolyte uptake and electrolyte wettability to electrolyte. PIA/PE separatorbased coin cells exhibited outstanding cycling and rate performances, especially at high current rates,compared to coin cells with a standard PE separator. Therefore, the new PIA/PE separator is an idealcandidate for use in high-safety lithium-ion batteries at high temperatures, based on its excellentthermal and chemical stability.
机译：为了解决常规隔膜对高温的脆弱性，建议对在严苛条件下使用的高安全性锂离子电池使用具有双层功能的新型双层功能。新型复合隔膜是通过将聚酰亚胺聚酰亚胺气凝胶（PIA）涂在多孔聚乙烯（PE）膜上，并使用聚偏二氟乙烯（PVDF）作为粘合剂制成的，从而提高了隔膜的热稳定性。 PIA / PE双层复合材料的性能非常好，特别是在热稳定性方面。与市售PE隔膜相比，新建议的隔膜显示出接近零的热收缩率，后者是具有较高含量的次品，并在高达140°C的温度下仍保持其结构。 PIA支撑层在热处理后几乎没有变化，PE层完美地发挥了关闭层的作用，确保了新隔膜的安全性。这些结果证明，PIA / PE隔板可以防止电池爆炸和过度充电。此外，PIA / PE隔膜还显示出优异的电解质吸收性和电解质对电解质的润湿性。与具有标准PE分隔器的纽扣电池相比，基于PIA / PE分隔器的纽扣电池表现出出色的循环和速率性能，尤其是在高电流速率下。因此，新型PIA / PE隔膜具有出色的热稳定性和化学稳定性，是高温下用于高安全性锂离子电池的理想选择。

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