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多层结构三元复合聚丙烯薄膜储能密度提升

Improvement in energy storage density of multilayer ternary composite polypropylene film
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摘要 将马来酸酐接枝聚丙烯与纳米ZrO_(2)粒子共同构筑的三元复合聚丙烯薄膜作为外层,纯聚丙烯薄膜作为中间层,制备了不同纳米ZrO_(2)含量的多层结构三元复合聚丙烯薄膜,并对复合薄膜的理化性能和电气性能进行了测试分析。结果表明:纳米ZrO_(2)粒子在三元复合聚丙烯体系内具有良好的分散性,并且三元复合聚丙烯薄膜与纯聚丙烯薄膜之间的层间界面清晰。多层三元复合聚丙烯薄膜的结晶度相比单层纯聚丙烯薄膜显著提升。随着纳米ZrO_(2)含量的增加,多层三元复合聚丙烯薄膜的介电常数提高,而直流电气强度则先上升后下降,在纳米ZrO_(2)质量分数为1.0%时达到最大值(424.3 kV/mm),相应的储能密度也达到最大值(2.14 J/cm^(3)),相比于纯聚丙烯薄膜分别提高了10.6%和31.3%,并且介质损耗因数保持在与纯聚丙烯薄膜相同的10-3水平。三元复合聚丙烯和层间界面能够共同抑制异极性空间电荷的迁移,进而有助于改善介质内部电场分布,提高电气强度,同时降低由于电子迁移产生的介质损耗。 Multilayer ternary composite polypropylene(PP)films with different content of nano-ZrO_(2) particles were prepared with a ternary composite PP film constructed by maleic anhydride grafted PP and nano-ZrO_(2) particles as the outer layer and neat PP film as the middle layer,and their physical and chemical properties as well as electrical properties were measured.The results show that the nano-ZrO_(2) exhibit good dispersibility in ternary composite PP system and there is a distinct interface between ternary composite PP film and neat PP film.The crystallinity of multilayer ternary composite PP films is higher than that of the single layer neat PP film.With the increase of nano-ZrO_(2) content,the dielectric constant of the multilayer ternary composite PP film increases,while the DC electric strength increases at first and then decreases.When the mass fraction of nano-ZrO_(2) reaches 1.0%,both the DC electric strength and energy storage density achieve the highest value(424.3 kV/mm and 2.14 J/cm^(3)),which are about 10.6%and 31.3%higher than those of the single layer neat PP film.Besides,the dielectric loss factor of multilayer ternary composite PP film remains at the same level of 10-3 as that of neat PP film.The ternary composite PP and interlayer interface can jointly suppress the migration of heteropolar space charges,which contributes to improve the internal electric field distribution of dielectric,increase the electric strength,and reduce the dielectric loss caused by electron migration.
作者 国江 许梦伊 李辉 黄想 林浩 姜胜宝 陈尚 陈程 GUO Jiang;XU Mengyi;LI Hui;HUANG Xiang;LIN Hao;JIANG Shengbao;CHEN Shang;CHEN Cheng(State Key Laboratory of Power Grid Environmental Protection,China Electric Power Research Institute,Wuhan 430074,China)
出处 《绝缘材料》 CAS 北大核心 2024年第1期40-45,共6页 Insulating Materials
基金 国家电网有限公司总部科技项目(5500-202155350A-0-0-00)。
关键词 聚丙烯 纳米电介质 多层结构 储能密度 电容器 polypropylene nano dielectric multilayer structure energy storage density capacitor
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