Vitrimer 离子凝胶走向可持续的固态电解质,RSC Advances

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Vitrimer 离子凝胶走向可持续的固态电解质
RSC Advances ( IF 3.9 ) Pub Date : 2023-02-27 , DOI: 10.1039/d2ra06829j
Fengdi Li ₁ , Giao T M Nguyen ₁ , Cédric Vancaeyzeele ₁ , Frédéric Vidal ₁ , Cédric Plesse ₁

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对柔性、可拉伸和可穿戴设备的需求不断增长，推动了用作聚合物电解质的离子凝胶的发展。基于 vitrimer 化学开发可修复的离子凝胶是提高其寿命的一种有前途的方法，因为这些材料通常在运行过程中会反复变形并且容易损坏。在这项工作中，我们首先报道了基于未广泛研究的缔合S的聚硫醚 vitrimer 网络的制备-使用硫醇-烯迈克尔加成的烷基转移交换反应。由于硫盐与硫醚亲核试剂的交换反应，这些材料表现出玻璃化聚体特性，例如愈合和应力松弛。然后通过在聚合物网络中加载 1-乙基-3-甲基咪唑双（三氟甲基磺酰基）亚胺或 1-乙基-3-甲基咪唑三氟甲磺酸盐（EMIM 三氟甲磺酸盐）来证明动态聚硫醚离子凝胶的制备。所得离子凝胶的杨氏模量为 0.9 MPa，离子电导率约为 10 ^-4 S cm ^-1在室温下。已经发现，添加离子液体 (IL) 会改变系统的动态特性，这很可能是由于 IL 对动态函数的稀释作用，但也可能是由于离子对烷基硫 OBrs 偶联的屏蔽作用IL本身。据我们所知，这是第一个基于S-烷基转移交换反应的玻璃化聚体离子凝胶。虽然添加离子液体会导致在给定温度下动态愈合效率降低，但这些离子凝胶可以为材料提供在应用温度下具有更高尺寸稳定性的材料，并可能为开发具有更长寿命的柔性电子产品的可调动态离子凝胶铺平道路。

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Vitrimer ionogels towards sustainable solid-state electrolytes

The growing demand for flexible, stretchable, and wearable devices has boosted the development of ionogels used as polymer electrolytes. Developing healable ionogels based on vitrimer chemistry is a promising approach to improve their lifetimes as these materials are usually subjected to repeated deformation during functioning and are susceptible to damage. In this work, we reported in the first place the preparation of polythioether vitrimer networks based on the not extensively studied associative S-transalkylation exchange reaction using thiol–ene Michael addition. Thanks to the exchange reaction of sulfonium salts with thioether nucleophiles, these materials demonstrated vitrimer properties such as healing and stress relaxation. The fabrication of dynamic polythioether ionogels was then demonstrated by loading 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide or 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMIM triflate) within the polymer network. The resulting ionogels exhibited Young's modulus of 0.9 MPa and ionic conductivities in the order of 10⁻⁴ S cm⁻¹ at room temperature. It has been found that adding ionic liquids (ILs) changes the dynamic properties of the systems, most likely due to a dilution effect of the dynamic functions by the IL but also due to a screening effect of the alkyl sulfonium OBrs-couple by the ions of the IL itself. To the best of our knowledge, these are the first vitrimer ionogels based on an S-transalkylation exchange reaction. While the addition of ILs resulted in less efficient dynamic healing at a given temperature, these ionogels can provide materials with more dimensional stability at application temperatures and can potentially pave the way for the development of tunable dynamic ionogels for flexible electronics with a longer lifespan.

更新日期：2023-02-27

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