Crosslinked P(VDF-CTFE)/PS-COOH nanocomposites for high-energy-density capacitor application
Crosslinked P(VDF-CTFE)/PS-COOH nanocomposites for high-energy-density capacitor application
复制标题
DOI：
10.1002/polb.24023
复制
发表时间：
2016-06
期刊：
影响因子：
--
通讯作者：
Yingxin Chen;Xin Tang;Jie Shu;Xiaoliang Wang;Wen-chao Hu;Qundong Shen
中科院分区：
文献类型：
--
作者：
Yingxin Chen;Xin Tang;Jie Shu;Xiaoliang Wang;Wen-chao Hu;Qundong Shen
高容量或高功率密度电容器正被积极研究用于便携式电子设备、电动车辆和电力系统。在聚偏氟乙烯-三氟氯乙烯[P（VDF-CTFE）]基体中加入少量羧基聚苯乙烯（PS-COOH）纳米粒子，然后通过化学交联制备了介电纳米复合材料。这两种方法的结合显著提高了低电场下的电能储存能力。特别地，具有2wt%纳米颗粒和15wt%交联剂的纳米复合材料在高达324 MV/m的电场下实现了17.2的介电常数和17.5J/cm 3（4.9Wh/L）的放电能量密度，而原始P（VDF-CTFE）的相应值分别为9.6和13.3J/cm 3（3.7Wh/L）。基本物理增强的纳米复合材料的性能相对于P（VDF-CTFE）的说明由固态19 F核磁共振直接激发或19 F {1H}交叉极化。结果表明，PS-COOH纳米粒子在晶化/非晶化过程中具有不同的动力学行为，有利于形成极性的γ型晶体。小角X射线散射研究揭示了界面对纳米复合材料中电能非凡储存的贡献。这种方法为设计或理解PVDF基聚合物在高能量密度电容器中的实际应用提供了一种简单而直接的方法。© 2016 Wiley Periodicals，Inc. J.波利姆科学，部分B：聚合物物理2016，54，1160-1169
High-capacity or high-power-density capacitors are being actively investigated for portable electronics, electric vehicles, and electric power systems. The dielectric nanocomposite with a small loading of carboxylic polystyrene (PS-COOH) nanoparticles in poly(vinylidene fluoride-chlorotrifluoroethylene) [P(VDF-CTFE)] matrix, followed by chemical crosslinking has been described. Combination of these two methods significantly improved the capacity of electric energy storage at low electric field. Specially, the nanocomposite with 2 wt % nanoparticles and 15 wt % crosslinking agent achieved a dielectric constant of 17.2 and a discharged energy density of 17.5 J/cm3 (4.9 Wh/L) at an electric field as high as 324 MV/m, while corresponding values for pristine P(VDF-CTFE) are 9.6 and 13.3 J/cm3 (3.7 Wh/L), respectively. Fundamental physics underlying the enhancement in the performance of the nanocomposites with respect to P(VDF-CTFE) is illustrated by solid-state 19F nuclear magnetic resonance of direct excitation or 19F{1H} cross polarization. It revealed different dynamics behavior between crystalline/amorphous regions, and PS-COOH nanoparticles favored the formation of polar γ-form crystals. Small-angle X-ray scattering studies revealed the contribution of the interface to the extraordinary storage of electric energies in the nanocomposites. This approach provided a facile and straightforward way to design or understand PVDF-based polymers for their practical applications in high-energy-density capacitors. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 1160–1169