Recent Development of High Energy Density Polymers for Dielectric Capacitors
Recent Development of High Energy Density Polymers for Dielectric Capacitors
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DOI：
10.1109/tdei.2010.5539672
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发表时间：
2010-08-01
影响因子：
3.1
通讯作者：
Zhang, Qiming
中科院分区：
文献类型：
--
作者：
Wang, Yong;Zhou, Xin;Zhang, Qiming
高能量密度介质材料是电容器和其他储能系统的理想材料。为了获得高的电能密度，人们开发了两种方法：探索高介电常数(K)材料和改善高工作电场。松弛铁电聚偏氟乙烯(PVDF)共聚物P(VDF-HFP)、P(VDF-CTFE)和三元共聚物P(VDF-TrFE-CFE)具有较高的电能密度。基于PVDF的聚合物的能量密度已达到25J/cm(3)以上，这代表了高能量密度聚合物的技术水平。用气相沉积法制备的芳香族聚脲薄膜具有较高的介电常数、较低的损耗、较高的击穿场强(~gt；800 mV/m)和较高的能量密度(~gt；12J/cm(3))。其高达200摄氏度的热稳定性和高充放电效率(>；90%)使其对高温电容器具有吸引力。通过扫描电子显微镜、原子力显微镜等实验研究表明，由于薄膜厚度和表面形态的不均匀，非平衡芳香族聚脲可以表现出明显的高K(类似于15)。本文综述了这些高性能聚合物的最新研究进展。
High energy density dielectric materials are desirable for capacitors and other energy storage systems. Two approaches were developed to achieve high electric energy density: explore high dielectric constant (K) materials and improve high operation electric field. Relaxor ferroelectric polyvinylidene fluoride (PVDF) based copolymers P(VDF-HFP), P(VDF-CTFE) and terpolymer P(VDF-TrFE-CFE) have been proven to possess high electric energy density. An energy density of over 25 J/cm(3) has been achieved in PVDF-based polymers, which represents the state of art in high energy density polymers. Aromatic polyurea thin films were developed through vapor phase deposition, exhibiting relatively high dielectric constant, low loss, high breakdown field (>800 MV/m) and consequently high energy density (>12 J/cm(3)). Its thermal stability up to 200 degrees C and high charge-discharge efficiency (>90%) make it attractive for high temperature capacitors. Investigation through SEM, AFM and other experiments indicated unbalanced aromatic polyurea could exhibit apparent high-K (similar to 15) due to the non-uniformity of film thickness and surface morphology. This article reviews the recent development of these high performance polymers.