Xueao Jiang , Zhaoen Liu , Weijian Liu , Da Yu , Jun Zhang , Xiwen Wang , Yan Zhang , Shiguo Zhang
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引用次数: 0
摘要
基于离子液体(IL)的凝胶电解质(离子凝胶)作为锂离子电池(LIB)的准固态电解质(QSSE)显示出巨大的潜力。然而,传统的离子凝胶面临着凝胶化过程复杂、凝胶剂含量高(通常大于 20 wt %)、电导率低于纯 IL 以及锂+转移率低等挑战。在这里,我们通过一种简单、环保的方法创造出了新型含锂盐的超分子离子凝胶(SIGs),作为锂离子电池的高效 QSSE。通过使用低分子量凝胶剂,特别是 12-hydroxyoctadecanoic acid,含锂的 IL 电解质可以在凝胶剂浓度仅为 2 wt % 的情况下固化。由此产生的物理离子凝胶具有显著特点,包括与纯锂离子电解质相似的高离子电导率和更好的电化学稳定性。此外,这些 SIG 还表现出独特的凝胶到溶胶的热可逆转变,这是其他 QSSE 无法达到的。这一特性促进了电极/电解质之间更好的接触,从而使使用 LiFePO4、LiNi0.8Co0.1Mn0.1O2 和 LiCoO2 阴极以及金属锂和 Li4Ti5O12 阳极的电池具有出色的性能。
Physical ionogels with only 2 wt % gelators as efficient quasi-solid-state electrolytes for lithium batteries
Ionic liquid (IL)-based gel electrolytes (ionogels) show great potential as quasi-solid-state electrolytes (QSSEs) for lithium-ion batteries (LIBs). However, conventional ionogels face challenges involving complex gelation processes, high gelator content (usually greater than 20 wt %), lower conductivity than neat ILs, and low Li+ transference numbers. Here, we create novel lithium salt-containing supramolecular ionogels (SIGs) as efficient QSSEs for LIBs through a simple and environmentally friendly approach. By using a low-molecular-weight gelator, specifically 12-hydroxyoctadecanoic acid, lithium-containing IL electrolytes can be solidified at a gelator concentration of only 2 wt %. The resulting physical ionogels exhibit remarkable characteristics, including high ionic conductivity similar to neat ILs and improved electrochemical stability. In addition, these SIGs demonstrate a distinctive thermally reversible gel-to-sol transition, a quality not attainable in other QSSEs. This feature promotes better electrode/electrolyte contact, enabling excellent battery performance using LiFePO4, LiNi0.8Co0.1Mn0.1O2, and LiCoO2 cathodes, along with Li metal and Li4Ti5O12 anodes.
期刊介绍:
Matter, a monthly journal affiliated with Cell, spans the broad field of materials science from nano to macro levels,covering fundamentals to applications. Embracing groundbreaking technologies,it includes full-length research articles,reviews, perspectives,previews, opinions, personnel stories, and general editorial content.
Matter aims to be the primary resource for researchers in academia and industry, inspiring the next generation of materials scientists.