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Mechanically Robust, Highly Ionic Conductive Gels Based on Random Copolymers for Bending Durable Electrochemical Devices
Advanced Functional Materials ( IF 19.0 ) Pub Date : 2018-02-06 , DOI: 10.1002/adfm.201706948
Dong Gyu Seo 1 , Hong Chul Moon 1
Affiliation  

Mechanically robust, highly ionic conductive gels based on a random copolymer of poly[styrene‐ran‐1‐(4‐vinylbenzyl)‐3‐methylimidazolium hexafluorophosphate] (P[S‐r‐VBMI][PF6]) and the ionic liquid 1‐ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMI][TFSI]) are successfully prepared. The gels with either homo P[VBMI][PF6] or conventional PS‐block‐poly(methyl methacrylate)‐block‐PS (SMS) show significant trade‐off between ionic conductivity and mechanical resilience. In contrast, the P[S‐r‐VBMI][PF6]‐based gels exhibit both large elastic modulus (≈0.105 MPa) and ionic conductivity (≈1.15 mS cm−1) at room temperature. To demonstrate that these materials can be used as solid‐state electrolytes, the ion gels are functionalized by incorporating electrochromic (EC) chromophores (ethyl viologen, EV2+) and are applied to EC devices (ECDs). The devices show low‐voltage operation, large optical transmittance variation, and good cyclic coloration/bleaching stability. In addition, flexible ECDs are fabricated to take advantage of the mechanical properties of the gels. The ECDs have excellent bending durability under both compressive and tensile strains. The versatile P[S‐r‐VBMI][PF6]‐based gel is anticipated to be of advantage in flexible electrochemical applications, such as batteries and electrochemical displays.

中文翻译:

基于无规共聚物的机械坚固,高离子导电凝胶,可弯曲耐用的电化学装置

基于聚的无规共聚物[苯乙烯机械上坚固的,高离子导电凝胶-ran- 1-(4-乙烯基苄基)-3-甲基咪唑鎓六氟磷酸盐](P [S -R- VBMI] [PF 6 ])和离子液体成功制备了1-乙基-3-甲基咪唑鎓双(三氟甲基磺酰基)酰亚胺([EMI] [TFSI])。均质P [VBMI] [PF 6 ]或常规PS-嵌段-聚(甲基丙烯酸甲酯)-嵌段-PS(SMS)的凝胶在离子电导率和机械回弹之间表现出显着的权衡。与此相反,在P [S -R- VBMI] [PF 6 ]为基础的凝胶表现出两个大的弹性模量(兆帕≈0.105)和离子传导率(≈1.15毫秒厘米-1) 在室温下。为了证明这些材料可以用作固态电解质,通过结合电致变色(EC)生色团(乙基紫精,EV 2+)对离子凝胶进行功能化,并将其应用于EC器件(ECD)。这些器件显示出低电压操作,较大的光学透射率变化以及良好的循环着色/漂白稳定性。另外,制造柔性ECD以利用凝胶的机械性能。ECD在压缩应变和拉伸应变下均具有出色的弯曲耐久性。多功能的P [S -R- VBMI] [PF 6 ]的基于凝胶预计将是有利的柔性电化学应用,如电池和电化学显示器。
更新日期:2018-02-06
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