Designing of Ferroelectric/Linear Dielectric Bilayer Films: An Effective Way to Improve the Energy Storage Performances of Polymer-Based Capacitors
Designing of Ferroelectric/Linear Dielectric Bilayer Films: An Effective Way to Improve the Energy Storage Performances of Polymer-Based Capacitors
复制标题
铁电/线性介电双层薄膜的设计：提高聚合物电容器储能性能的有效途径
DOI：
10.1021/acs.jpcc.9b11486
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发表时间：
2020-03-19
影响因子：
3.7
通讯作者：
Lei, Qingquan
中科院分区：
文献类型：
--
作者：
Chen, Chen;Xing, Jiwen;Lei, Qingquan
采用流延法制备了具有线性极化特性的聚酰亚胺（PI）和具有非线性铁电极化特性的聚（偏氟乙烯-三氟乙烯-氯氟乙烯）/聚酰亚胺（P（VDF-TrFE-CFE）/PI）双层膜。系统地研究了双层复合膜的微观结构、极化行为和储能性能。结果表明，P（VDF-TrFE-CFE）层与PI层的界面均匀连续。与单层膜相比，双层膜的介电常数和击穿场强均高于PI膜，提高了放电能量密度，且与P（VDF-TrFE-CFE）相比，双层膜的剩余极化得到有效抑制，储能效率得到提高。通过调节PI的体积含量，得到了性能优良的P（VDF-TrFE-CFE）/PI双层膜，当PI含量为50vol%时，其放电能量密度为9.6J/cm ~ 3，储能效率为58%。研究结果表明，构建铁电/线性双层膜是提高柔性聚合物电容器储能性能的有效途径。
In this paper, poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene)/polyimide (abbreviated as P(VDF-TrFE-CFE)/PI) bilayer films are prepared by a casting method, where the PI with linear polarization characteristics is used as the bottom layer and P(VDF-TrFE-CFE) with nonlinear ferroelectric polarization characteristics is used as the top layer. The microstructure, polarization behavior, and energy storage performances of the bilayer composite films have been systematically investigated. The results show that the interfaces between the P(VDF-TrFE-CFE) layer and PI layer are uniform and continuous. On comparing with individual films, it is observed that the dielectric constant and breakdown field strength of bilayer films are higher than those of PI films, leading to the improved discharge energy density, and the residual polarization of bilayer films is effectively suppressed compared to that of P(VDF-TrFE-CFE), resulting in the enhanced energy storage efficiency. Excellent energy storage performances have been obtained by regulating the volume content of PI in P(VDF-TrFE-CFE)/PI bilayer films, which possess a discharge energy density of 9.6 J/cm(3) and an energy storage efficiency of 58% with a PI content of 50 vol %. The results of this work indicate that constructing the ferroelectric/linear bilayer films is an effective way to improve the energy storage performances of flexible polymer-based capacitors.