Polymer-ceramic nanocomposites for high energy density applications
Polymer-ceramic nanocomposites for high energy density applications
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DOI：
10.1007/s10971-014-3573-4
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发表时间：
2015-03-01
影响因子：
2.5
通讯作者：
Chrisey, Douglas B.
中科院分区：
文献类型：
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作者：
Adireddy, Shiva;Puli, Venkata S.;Chrisey, Douglas B.
新一代电容储能需要具有纳米结构的新型材料来与传统的储能方法竞争。虽然目前的材料和加工策略可以生产具有增强介电常数的电容器，但它们的击穿强度很低。本文所描述的新制备路线提供了具有高介电常数和高击穿强度的柔性、独立的纳米复合薄膜。采用溶剂热法合成了单分散陶瓷填料[BaTiO3、Ba1-xCaxTiO3 （X = 0.3 +/- A 0.05）和BaZr1-xTixO3 (X = 0.2 +/- A 0.05)]。将表面交换的纳米颗粒与聚偏氟乙烯（PVDF）结合，制备了稳定的聚合物-陶瓷共混物。由此制备的PVDF/陶瓷纳米复合材料具有高介电常数、低正切损耗和高击穿强度等特点。计算得到的BaTiO3、Ba1-xCaxTiO3 [X = 0.3 +/- A 0.05]和bazr2 - xtixo3 [X = 0.2 +/- A 0.05]纳米复合膜的最大能量密度分别为3.24、4.72和7.74 J cm（-3）。这是介电常数和击穿强度对体积分数的依赖关系相互作用的结果。认为陶瓷和聚合物组分之间的相互作用，由表面羟基官能团增强，是改善介电性能的主要原因。这种方法是通用的，并且很容易适用于聚合物-陶瓷复合材料的其他组合，从而可以开发协同性能。
Next-generation capacitive energy storage requires novel materials with engineered nano-architectures to compete with conventional methods for energy storage. While current materials and processing strategies produce capacitors with enhanced dielectric permittivity, their breakdown strengths are low. The new fabrication route described in this paper provides flexible, free-standing nanocomposite films with high dielectric permittivity and high breakdown strength. Monodispersed ceramic fillers [BaTiO3, Ba1-xCaxTiO3 (X = 0.3 +/- A 0.05), and BaZr1-xTixO3 (X = 0.2 +/- A 0.05)] were synthesized via solvothermal method. Surface-exchanged nanoparticles were combined with polyvinylidene fluoride (PVDF) to fabricate stable polymer-ceramic blends. The PVDF/ceramic nanocomposites resulting from this approach have high dielectric permittivity, low loss tangent, and high electric breakdown strength. The calculated maximum energy densities for the BaTiO3, Ba1-xCaxTiO3 [X = 0.3 +/- A 0.05], and BaZr1-xTixO3 [X = 0.2 +/- A 0.05] nanocomposite films are 3.24, 4.72, and 7.74 J cm(-3) respectively. This a result of the interplay between the dependencies of permittivity and breakdown strength on volume fraction. It is proposed that the interaction, enhanced by functionalized surface hydroxyl groups, between ceramic and polymer components is the main reason for the improved dielectric properties. This approach is versatile and is readily applicable to other combinations of polymer-ceramics composites so that cooperative properties can be exploited.