Characterization of morphology in ring-opening metathesis polymerized novel solid block copolymer electrolytes by atomic force microscopy and X-ray scattering
Characterization of morphology in ring-opening metathesis polymerized novel solid block copolymer electrolytes by atomic force microscopy and X-ray scattering
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DOI：
10.1016/j.electacta.2018.12.051
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发表时间：
2019-03
影响因子：
6.6
通讯作者：
Megan Longstaff;Kaitlin Gardiner;R. Zhuravlev;J. Finney;D. Waldow
中科院分区：
文献类型：
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作者：
Megan Longstaff;Kaitlin Gardiner;R. Zhuravlev;J. Finney;D. Waldow
嵌段共聚物能够设计固体聚合物电解质，使其同时具有离子电导率和结构特征，这可能会提高锂离子电池的安全性。我们报告了使用开环复分解聚合合成的新型嵌段共聚物电解质的形态研究。这些单体具有氧杂降冰片烯二甲酰亚胺主链，其中第一嵌段具有低聚(n=12)环氧乙烷(OEO)侧链，第二嵌段具有苯基侧基。前一种嵌段实现了高盐溶解度，而后一种嵌段是具有高玻璃化转变温度的结构组分。已经合成了嵌段共聚物，其组成范围为 38 至 70wt% 的含苯基嵌段，并且已经对纯嵌段共聚物和双（三氟甲烷）磺酰亚胺锂盐进行了研究。使用原子力显微镜和小角 X 射线散射 (SAXS) 研究所得形态。发现溶剂蒸气退火增强了纯共聚物薄膜的有序性，并且在溶剂蒸气退火中添加盐进一步增加了长程有序性。圆柱和层状结构在观察到的形态中占主导地位，盐的添加增加了具有层状结构的嵌段共聚物组合物的有序性和范围。 SAXS 结果表明适度的有序性，强化了 AFM 的观察结果，并显示域大小随着盐浓度的增加而增加。
Block copolymers present the ability to design solid polymer electrolytes to include both ion conductivity and structural features which may lead to improved safety in lithium ion batteries. We report a morphology study of novel block copolymer electrolytes that were synthesized using ring opening metathesis polymerization. The monomers have an oxanorbornene dicarboximide backbone where the first block has oligomeric (n = 12) ethylene oxide (OEO) side chains and the second block has phenyl side groups. The former block achieves high salt solubility, while the latter block is a structural component with a high glass transition temperature. Block copolymers have been synthesized covering a range of compositions from 38 to 70 wt % of the phenyl containing block, and have been studied neat and with bis(trifluoromethane)sulfonimide lithium salt. The resulting morphologies were investigated using atomic force microscopy and small angle X-ray scattering (SAXS). Solvent vapor annealing was found to enhance ordering in the neat copolymer thin films and the addition of salt with solvent vapor annealing further increased long range order. Cylinder and lamellar structures dominate the observed morphologies and the addition of salt increases ordering and the range block copolymer compositions with lamellar structure. SAXS results demonstrate modest ordering, reinforce the observations from AFM, and show an increase in domain size with an increase in salt concentration.