组成对P（VDF-TrFE-CFE）弛豫三元共聚物极化滞后和储能能力的影响
Effect of Composition on Polarization Hysteresis and Energy Storage Ability of P(VDF-TrFE-CFE) Relaxor Terpolymers.
作者信息
Hambal Yusra, Shvartsman Vladimir V, Lewin Daniil, Huat Chieng Huo, Chen Xin, Michiels Ivo, Zhang Qiming, Lupascu Doru C
机构信息
Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany.
Department of Electrical Engineering, Materials Research Institute, The Pennsylvania State University, University Park, State College, PA 16802, USA.
出版信息
Polymers (Basel). 2021 Apr 20;13(8):1343. doi: 10.3390/polym13081343.
The temperature dependence of the dielectric permittivity and polarization hysteresis loops of P(VDF-TrFE-CFE) polymer films with different compositions are studied. Among them, the three compositions, 51.3/48.7/6.2, 59.8/40.2/7.3, and 70/30/8.1, are characterized for the first time. Relaxor behavior is confirmed for all studied samples. Increasing the CFE content results in lowering the freezing temperature and stabilizes the ergodic relaxor state. The observed double hysteresis loops are related to the field-induced transition to a ferroelectric state. The critical field corresponding to this transition varies with the composition and temperature; it becomes larger for temperatures far from the freezing temperature. The energy storage performance is evaluated from the analysis of unipolar polarization hysteresis loops. P(VDF-TrFE-CFE) 59.8/40.2/7.3 shows the largest energy density of about 5 J·cm (at the field of 200 MV·m) and a charge-discharge efficiency of 63%, which iscomparable with the best literature data for the neat terpolymers.
研究了不同组成的P(VDF-TrFE-CFE)聚合物薄膜的介电常数和极化滞后回线的温度依赖性。其中，首次对51.3/48.7/6.2、59.8/40.2/7.3和70/30/8.1这三种组成进行了表征。证实了所有研究样品均具有弛豫铁电体行为。增加CFE含量会导致冻结温度降低，并使遍历性弛豫铁电体状态稳定。观察到的双滞后回线与场诱导的铁电态转变有关。对应于该转变的临界场随组成和温度而变化；对于远离冻结温度的温度，它会变大。通过对单极极化滞后回线的分析来评估储能性能。P(VDF-TrFE-CFE) 59.8/40.2/7.3显示出约5 J·cm³的最大能量密度（在200 MV·m的电场下）和63%的充放电效率，这与纯三元共聚物的最佳文献数据相当。
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