Biphasic epoxy-ionic liquid structural electrolytes: minimising feature size through cure cycle and multifunctional block-copolymer addition
Biphasic epoxy-ionic liquid structural electrolytes: minimising feature size through cure cycle and multifunctional block-copolymer addition
复制标题
DOI：
10.1088/2399-7532/ac1ea7
复制
发表时间：
2021
影响因子：
--
通讯作者：
Qu Wendong;J. Dent;V. Arrighi;L. Cavalcanti;M. Shaffer;N. Shirshova
中科院分区：
文献类型：
--
作者：
Qu Wendong;J. Dent;V. Arrighi;L. Cavalcanti;M. Shaffer;N. Shirshova
结构电解质提供接近结构树脂的机械性能以及高度的离子导电性。在这里，基于双酚A二缩水甘油醚和离子液体1-乙基-3-甲基咪唑鎓双（三氟甲基磺酰基）酰亚胺（EMIM-TFSI）的结构电解质通过使用异佛尔酮二胺（iPDA）作为固化剂的反应诱导相分离（RIPS）来合成。通过初始配方和固化温度控制所得材料的微观结构和性能。在室温下固化产生了双连续结构，并改善了所得结构电解质的机械性能和离子电导率。性能之间的平衡可以系统地调节;例如，对于含有35体积% EMIM-TFSI的配方，同时获得了800 MPa的有希望的杨氏模量和0.28 mS cm-1的离子电导率。通过引入基于甲基丙烯酸缩水甘油酯（GMA）和季铵化甲基丙烯酸（2-二甲氨基）乙酯（DMAEMA）的多官能嵌段共聚物（MF-bcP），结构特征的长度尺度减小了一个数量级。小角中子散射（SANS），在固化过程中获得的，确定了至少两个不同的长度尺度的结构相，为配方中含有MF-bcP，在协议中使用扫描电子显微镜观察到的微观结构。当使用还具有更精细特征长度尺度的结构电极时，可能需要这样的结构电解质。将MF-bcP添加到含有35体积% EMIM-TFSI的制剂中产生杨氏模量为530 MPa且离子电导率为0.64 mS cm-1的结构电解质。
Structural electrolytes provide mechanical properties approaching structural resin combined with a high degree of ionic conductivity. Here, structural electrolytes based on bisphenol A diglycidyl ether and the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (EMIM-TFSI) were synthesised through reaction induced phase separation (RIPS) using isophorone diamine (iPDA) as a curing agent. The microstructure and properties of the resulting materials were controlled through both the initial formulations and the curing temperature. Curing at room temperature generated a bi-continuous structure and improved both mechanical performance and ionic conductivity of the resulting structural electrolytes. The balance between properties can be systematically adjusted; for example, a promising Young’s modulus of 800 MPa was obtained simultaneously with an ionic conductivity of 0.28 mS cm−1, for a formulation containing 35 vol% EMIM-TFSI. The lengthscale of the structural features was reduced by an order of magnitude by introducing multifunctional block-copolymers (MF-bcP) based on glycidyl methacrylate (GMA) and quaternised (2-dimethylamino)ethyl methacrylate (DMAEMA). Small angle neutron scattering (SANS), obtained during curing, identified at least two structural phases of different length scale, for the formulations containing MF-bcP, in agreement with microstructures observed using scanning electron microscopy. Such structural electrolytes may be required when using structural electrodes that also have finer characteristic lengthscales. The addition of the MF-bcP to formulations containing 35 vol% EMIM-TFSI produced structural electrolytes with a Young’s modulus of 530 MPa and an ionic conductivity of 0.64 mS cm−1.