Anhydrous Proton Conducting Polymer Electrolyte Membranes via Polymerization-Induced Microphase Separation
Anhydrous Proton Conducting Polymer Electrolyte Membranes via Polymerization-Induced Microphase Separation
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DOI：
10.1021/acsami.5b12366
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发表时间：
2016-03-09
影响因子：
9.5
通讯作者：
Lodge, Timothy P.
中科院分区：
文献类型：
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作者：
Chopade, Sujay A.;So, Soonyong;Lodge, Timothy P.
固态聚合物电解质膜（PEM）具有高离子电导率以及机械鲁棒性和高热稳定性，对于下一代锂离子电池和高温燃料电池的设计至关重要。我们提出了纳米结构质子交换膜的原位制备，将质子离子液体（IL）掺入通过聚合诱导的微相分离产生的微相分离嵌段共聚物的一个域中。这种简便的一锅合成策略将由聚环氧乙烷（PEO）大链转移剂、苯乙烯和二乙烯基苯单体以及质子IL组成的均质液体前体转化为坚固且透明的整体材料。所得的 PEM 表现出双连续形态，包括 PEO/质子 IL 传导通路和高度交联的聚苯乙烯 (PS) 结构域。交联的 PS 机械支架赋予 PEM 热稳定性和机械稳定性，在 180 摄氏度下弹性模量接近 10 MPa，而不会牺牲系统的离子电导率。至关重要的是，PEO/质子 IL 导电纳米通道的长程连续性导致在 180 摄氏度时具有 14 mS/cm 的出色离子电导率。我们假设质子 IL 中的质子传导通过车辆机制发生，并且 PEM 的平均质子转移数为 0.7。这种方法对于开发具有优异质子传导性的高温、坚固的质子交换膜非常有前景。
Solid-state polymer electrolyte membranes (PEMs) exhibiting high ionic conductivity coupled with mechanical robustness and high thermal stability are vital for the design of next-generation lithium-ion batteries and high-temperature fuel cells. We present the in situ preparation of nanostructured PEMs incorporating a protic ionic liquid (IL) into one of the domains of a microphase-separated block copolymer created via polymerization induced microphase separation. This facile, one-pot synthetic strategy transforms a homogeneous liquid precursor consisting of a poly(ethylene oxide) (PEO) macro-chain-transfer agent, styrene and divinylbenzene monomers, and protic IL into a robust and transparent monolith. The resulting PEMs exhibit a bicontinuous morphology comprising PEO/protic IL conducting pathways and highly cross-linked polystyrene (PS) domains. The cross linked PS mechanical scaffold imparts thermal and mechanical stability to the PEMs, with an elastic modulus approaching 10 MPa at 180 degrees C, without sacrificing the ionic conductivity of the system. Crucially, the long-range continuity of the PEO/protic IL conducting nanochannels results in an outstanding ionic conductivity of 14 mS/cm at 180 degrees C. We posit that proton conduction in the protic IL occurs via the vehicular mechanism and the PEMs exhibit an average proton transference number of 0.7. This approach is very promising for the development of high-temperature, robust PEMs with excellent proton conductivities.