电容器储能以其轻便、高效、环保等特点正在逐步引起人们的重视.为制备高储能密度的电容器介质材料,研究以聚偏氟乙烯(PVDF)为基体,以纳米尺度的导电聚苯胺(PANI)为填料,采用溶液法及后续的球磨工艺制备了高储能密度的全有机复合薄膜介质材料.研究了添加物含量、频率等因素对复合介质材料介电性能的影响.发现当PANI体积分数达到0.05时(略高于渗流阈值fc=0.041),复合薄膜的介电常数在100Hz条件下高达456,击穿场强为60 MV/m,储能密度达到了7.2 J/cm 3,与PVDF基体相比提高了3倍多.另外还发现即使在渗流阈值附近,复合薄膜介电性能仍具有一定的频率稳定性.介电常数在低频范围(102～104Hz)内基本保持不变.利用SEM对复合薄膜的表面形貌进行了分析,发现有机填料PANI粒子在PVDF基体内有很好的分散性.另外利用XRD分析了复合薄膜的晶体结构,发现该制备工艺条件下所得复合材料基体主要以β-PVDF形式存在,这有助于发挥PVDF基体的功能性.渗流阈值理论可用来解释介电常数随添加物含量和频率的变化规律.研究结果表明,该制备工艺可得到适用于较宽频率范围的高储能密度复合薄膜.
参考文献
| [1] | 朱志芳,林福昌,戴玲.高储能密度陶瓷电容器的性能[J].强激光与粒子束,2004(10):1341-1344. |
| [2] | 王珏,王德生,严萍,杨士勇,潘洋,胡爱军,张适昌.高储能密度复合绝缘材料的研究[J].电工电能新技术,2005(02):24-27. |
| [3] | Dang Z M;Wang L;Wang H Y.Rescaled Temperature Dependence of Dielectric Behavior in Ferroelectric PVDFLTNO Composites[J].Applied Physics Letters,2005(86):179205-179207. |
| [4] | Dang ZM.;Wu JB.;Fan LZ.;Nan CW. .Dielectric behavior of Li and Ti co-doped NiO/PVDF composites[J].Chemical Physics Letters,2003(3-4):389-394. |
| [5] | Milind Arbatti;Xiaobing Shan;Zhongyang Cheng .Ceramic-Polymer Composites with High Dielectric Constant[J].Advanced Materials,2007(10):1369-1372. |
| [6] | Zhang Q M;Bharti V;Zhao X.Giant Electrostriction and Relaxor Ferroelectric Behavior in Electron-irradiated P (VDF-TrFE)Copolymer[J].Science,1998(280):2101-2104. |
| [7] | Dang Z M;Wang L;Yin Y.Giant Dielectric Permittivities in Functionalized Carbon-Nanotube/Electroactive-Polymer Nanoeomposites[J].Advanced Materials,2007(19):852-857. |
| [8] | Chen Q;Du PY;Jin L;Weng WJ;Han GR .Percolative conductor/polymer composite films with significant dielectric properties[J].Applied physics letters,2007(2):22912-1-22912-3-0. |
| [9] | Nan C W.Physics of Inhomogeneous Inorganic Materlals[J].Progress in Materials Science,1993(37):1-116. |
| [10] | Yuan J K;Dang Z M;Bai J.Unique Dielectric Properties in Polyaniline/Poly(vinyljdene fluoride)Composites Induced by Temperature Variation[J].Physical Status Solidi,2008(05):233-235. |
| [11] | Dang Z M;Lin Y H;Nan C W .Novel Ferroelectric Polymer-matrix Composites with a High Dielectric Constant at the Percolation Threshold[J].Advanced Materials,2003,15(19):1625-1628. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%