全聚合物复合薄膜介电储能性能  

Dielectric and energy storage performance of all-polymer composite films

作　　者：雷军[1] 周柏杰 蔡凡一 聂闰盼 李忠明[1] LEI Jun;ZHOU Baijie;CAI Fanyi;NIE Runpan;LI Zhongming(College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China;Nari Group Corporation, State Grid Electric Power Research Institute, Nanjing 211106, China)

机构地区：[1]四川大学高分子科学与工程学院,成都610065 [2]国网电力科学研究院南瑞集团有限公司,南京211106

出　　处：《中国科技论文》2021年第4期354-359,364,共7页China Sciencepaper

基　　金：国家电网有限公司总部科技项目(524606180122)。

摘　　要：为了提高聚合物电介质材料的介电性能和能量存储性能,通过单轴拉伸工艺制备了取向聚丙烯/聚偏氟乙烯(polypropylene/polyvinylidene fluoride,PP/PVDF)复合薄膜。结果表明,在较高拉伸比条件下,复合薄膜介电常数(ε′r=4.9)在1×10^(3) Hz时相比于PP(ε′r=2.3)提高约1倍,介电损耗(tanδ)则低至5.5×10^(-3),与未拉伸样品(tanδ=1.1×10^(-2))相比降低50%,与PVDF(tanδ=2.4×10^(-2))相比降低77%,与纯PP(tanδ=3.4×10^(-3))相比仅增加62%。复合薄膜在100 MV/m电场作用下放电能量密度达到2.3×10^(-1) J/cm^(3),充放电效率达到98%。In order to improve the dielectric properties and energy storage performance of polymer dielectrics,the oriented polypropylene/polyvinylidene fluoride(PP/PVDF)composite films were prepared by uniaxial stretching.It was found that the dielectric constant(ε′r=4.9)of the composite film was about double that of PP(ε′r=2.3)at 1×10^(3) Hz under the condition of higher draw ratio.The dielectric loss(tanδ)was as low as 5.5×10^(-3),which was 50%and 77%lower than the unstretched sample(tanδ=1.1×10^(-2))and PVDF(tanδ=2.4×10^(-2)),respectively.The dielectric loss increased only 62%compared to pristine PP(tanδ=3.4×10^(-3)).The composite films also achieved discharge energy density of 2.3×10^(-1) J/cm^(3) and charge-discharge efficiency of 98%under the electric field of 100 MV/m.

关 键 词：材料加工 聚合物 单轴拉伸 电介质 

分 类 号：O631.1[理学—高分子化学]