PEO/LAGP hybrid solid polymer electrolytes for ambient temperature lithium batteries by solvent-free, "one pot" preparation
PEO/LAGP hybrid solid polymer electrolytes for ambient temperature lithium batteries by solvent-free, "one pot" preparation
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DOI：
10.1016/j.est.2019.100947
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发表时间：
2019-12-01
影响因子：
9.4
通讯作者：
Gerbaldi, Claudio
中科院分区：
文献类型：
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作者：
Piana, Giulia;Bella, Federico;Gerbaldi, Claudio
在这里，我们报告了通过快速，真正无溶剂，因此可扩展的制备工艺获得的混合固体聚合物电解质（HSPE）。HSPE的组成非常简单：用LiTFSI添加聚环氧乙烷（PEO）聚合物基体包裹nasicon型Li1.5Al0.5Ge1.5(PO4)(3) （LAGP）超级Li+离子导电陶瓷。通过简单地在“一个锅”中混合并在中等温度下热压干燥粉末的固体混合物，可以获得均匀，自立，机械坚固的固体电解质薄膜。值得注意的是，与用于复合电解质的其他几种超级离子导体不同，LAGP在空气气氛中相对稳定，可以在干燥室中处理，这比ar填充的干手套箱更有利于工业制造安全锂电池，价格便宜且可扩展。LAGP粉末、PEO和LiTFSI的适当均匀混合导致HSPE在实验室规模的锂电池中具有有趣的电化学行为，特别是在高电流状态下，甚至在环境温度下。基于hspe的电池优于基于peo - litfsi的电池，在比容量输出（在非常高的2C速率下保留约70%的理论值），有限的衰落和出色的库仑效率（> 99.5%）方面，即使在低速率下也是如此。界面稳定性问题仍有待解决，主要与LAGP与锂金属接触时的反应性有关，但本文提出的研究结果代表了迈向高能/动力技术的真正全固态电池的一步，确保了在各种操作条件下的安全性和性能。
Here, we report hybrid solid polymer electrolytes (HSPE) obtained by rapid, truly solvent-free, thus scalable preparation process. HSPE composition is very simple: a LiTFSI added poly(ethylene oxide) (PEO) polymer matrix encompassing NASICON-type Li1.5Al0.5Ge1.5(PO4)(3) (LAGP) super Li+ ion conducing ceramic. Homogeneous, self-standing, mechanically robust solid electrolyte films are obtained by simply mixing in "one pot" and hot pressing the solid mixture of dry powders at moderate temperature. Noteworthy, unlike several other super ionic conductors used for composite electrolytes, LAGP is relatively stable in air atmosphere and can be processed in a dry-room, which is more favorable, cheap and scalable than Ar-filled dry glove box for industrial fabrication of safe lithium batteries. The proper, homogeneous mixing of LAGP powder, PEO and LiTFSI leads to HSPE with interesting electrochemical behavior in lab-scale lithium cells, especially under high current regimes, and even at ambient temperature. HSPE-based cells outperform the PEO-LiTFSI-based counterpart, in terms of specific capacity output (about 70% of the theoretical value retained at very high 2C rate), limited fading and excellent Coulombic efficiency ( > 99.5%) even at low rate. Interfacial stability issues remain to be solved, chiefly linked to the reactivity of LAGP in contact with lithium metal, but results here proposed represent a step further toward truly all-solid-state batteries conceived for high energy/power technologies, assuring safety and performance in a wide range of operating conditions.