PVH基全有机复合薄膜储能性能研究  

Research on energy storage performance of PVH based all-organic composite films

作　　者：朱久军 朱志彪 付廷玉 侯亚飞 ZHU Jiujun;ZHU Zhibiao;FU Tingyu;HOU Yafei(School of Physical Science and Technology,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学物理科学与技术学院,浙江宁波315211

出　　处：《绝缘材料》2024年第11期40-50,共11页Insulating Materials

基　　金：宁波市自然科学基金资助项目(2023J130);省属高校基本科研业务费项目(理)(SJLY 2024009)。

摘　　要：在薄膜电容器中自由电子过多会使得漏电流密度增加,电气强度降低,促使电容器击穿,从而阻碍了其获得优异的储能性能。为了减少自由电子和二次碰撞电离电子(SIE)对储能性能的影响,本文选择将苝酰亚胺(PDI)、1,4,5,8-萘四甲酸酐(NDI)和4-氰基-4′-戊基联苯(5CB)分别掺入聚偏氟乙烯-六氟丙烯(PVH)中构建全有机复合薄膜,对3种复合薄膜的结构、热学性能和储能性能等方面进行研究。结果表明:PDI质量分数为0.5%的PDI/PVH复合薄膜具有较好的热性能,更小的晶粒尺寸以及更紧密的晶格结构,有助于获得更高的电气强度和放电能量密度。通过对比发现PDI具有更合适的能带结构和电导率,使PDI/PVH复合薄膜具备更好的储能性能。0.5%PDI/PVH复合薄膜在499.7 MV/m的放电能量密度达到了16.6 J/cm^(3),并且保持了80.5%的高充放电效率。Excessive free electrons in thin film capacitors will increase the leakage current density,reduce the electric strength,and promote the breakdown of capacitors,thus preventing them from obtaining excellent energy storage performance.To mitigate the impact of free electrons and secondary impact ionization electrons(SIE)on energy storage performance,this study introduced perylene diimide(PDI),1,4,5,8-naphthalenetetracarboxylic dianhydride(NDI),and 4-cyano-4′-pentylbiphenyl(5CB)into polyvinylidene-hexafluoropropylene(PVH)to construct an all-organic composite films,respectively,and the structure,thermal properties,and energy storage performance of three kinds of films were studied.The results show that PDI/PVH composite film with PDI mass fraction of 0.5%has the better thermal properties,smaller grain size,and tighter lattice structure,which is helpful to achieve higher electric strength and discharge energy density.Through comparison,it is found that PDI possesses a more suitable band structure and conductivity,which makes PDI/PVH composite film have better energy storage performance.The discharge energy density of 0.5%PDI/PVH composite film achieves 16.6 J/cm3 at 499.7 MV/m,and maintains a high charge-discharge efficiency of 80.5%.

关 键 词：电子陷阱 全有机 复合材料 储能性能 

分 类 号：TM215[一般工业技术—材料科学与工程]