Direct transformation of bijels into bicontinuous composite electrolytes using a pre-mix containing lithium salt
Direct transformation of bijels into bicontinuous composite electrolytes using a pre-mix containing lithium salt
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使用含有锂盐的预混合物将 Bijels 直接转化为双连续复合电解质
DOI：
10.1039/c7mh01038a
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发表时间：
2018-05-01
影响因子：
13.3
通讯作者：
Clegg, Paul S.
中科院分区：
文献类型：
--
作者：
Cai, Dongyu;Richter, Felix H.;Clegg, Paul S.
我们报道了一种在可控方式下制备双连续导电复合材料的一般策略。我们的方法开始于由含有盐的预混合制成的双连续界面堵塞的乳胶凝胶(Bijel)，在这里是双(三氟甲烷)磺酰亚胺锂盐(LiTFSI)。所得到的结构具有相互穿透的离子导电区和非导电区，由体积大致相等的富含碳酸亚乙酯(EC)相和富含对二甲苯(二甲苯)相组成。这是首次使用一对部分可混溶的液体制造比耶尔，由于盐的添加，这些液体的相行为已被改变。将聚苯乙烯(PS)扩散到富二甲苯相中，可以轻松地形成填充PS的双凝胶，而不是添加单体的多步聚合。干燥双凝胶可以选择性地去除二甲苯，在不影响EC结构域形态的情况下减少总样品体积。复合电解液的电化学阻抗谱证实了离子传导通路的存在。
We report a general strategy for making bicontinuous conducting composite materials in a controllable fashion. Our approach begins with a bicontinuous interfacially jammed emulsion gel (bijel) fabricated from a pre-mix containing a salt, here bis(trifluoromethane)sulfonimide lithium salt (LiTFSI). The resulting structure has interpenetrating ionic conducting and non-conducting domains composed of an ethylene carbonate (EC)-rich phase and a p-xylene (xylene)-rich phase of roughly equal volumes. This is the first time that bijel fabrication has been carried out using a pair of partially miscible liquids whose phase behaviour has been modified due to the addition of salt. Diffusing polystyrene (PS) into the xylene-rich phase enables the facile formation of a PS-filled bijel in place of a multi-step polymerization of added monomers. Drying the bijel results in the selective removal of xylene, reducing the total sample volume without compromising the morphology of the EC domain. Electrochemical impedance spectroscopy of the composite electrolytes confirms the existence of ion conducting pathways.