Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2019-12-02 , DOI: 10.1016/j.cej.2019.123662
Siyu Chen , Guodong Meng , Bo Kong , Bing Xiao , Zhengdong Wang , Ziang Jing , Yushuan Gao , Guanglei Wu , Hong Wang , Yonghong Cheng
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Crosslinked structure is proved to be efficient to improve breakdown strength (EB), thermal stability and charge-discharge efficiency (η) of polymer film capacitors, which is of great interest for their application in electric power systems and electrical automobile industry. However, highly crosslinked molecular networks usually lead to weak polarization ability of polymer, which greatly restrict their energy storage density (Ud). To improve polymers’ high-field polarization ability while guaranteeing their EB and thermal stability, we propose the asymmetric molecular chain structure in crosslinked network of epoxy resin by attaching ringlike alicyclic amine (ACA) and linear polyether amine (PEA) on phenol via Mannich reaction. The film exhibits high Ud up to 9.12 Jcm-3 at 550MVm-1 and ambient temperature with 90% efficiency, which is a record high value for Ud among single-layer polymer under the same condition. At 200 MVm-1 and 120°C, a future operating condition towards electric-vehicle applications, prepared film still exhibits Ud of 1 Jcm-3 with 90% efficiency, which is twice of the state-of-the-art BOPP. The results prove that the asymmetric ACA-PEA structure can greatly improve Ud of crosslinked polymer film while maintaining superior energy storage efficiency at high temperature. This work paves a new way for the material design of high-performance polymer film capacitor.
中文翻译:
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不对称脂环族胺-聚醚胺分子链结构可提高高温交联聚合物电容器的储能密度
事实证明,交联结构可有效提高聚合物薄膜电容器的击穿强度(E B),热稳定性和充放电效率(η),这对其在电力系统和电动汽车工业中的应用具有极大的兴趣。然而,高度交联的分子网络通常导致聚合物的极化能力弱,这极大地限制了它们的储能密度(U d)。在保证聚合物E B的同时提高聚合物的高场极化能力以及热稳定性,我们通过曼尼希反应将环状脂环族胺(ACA)和线性聚醚胺(PEA)连接在苯酚上,提出了环氧树脂交联网络中的不对称分子链结构。该膜在550MVm -1和环境温度下以90%的效率显示高达9.12 Jcm -3的高U d,这是相同条件下单层聚合物中U d的创纪录的高值。在200 MVm -1和120°C(面向电动汽车的未来运行条件)下,制得的薄膜仍显示U d为1 Jcm -3效率高达90%,是最先进的BOPP的两倍。结果证明,不对称的ACA-PEA结构可以大大提高交联聚合物薄膜的U d,同时在高温下保持优异的储能效率。这项工作为高性能聚合物薄膜电容器的材料设计开辟了一条新途径。