Enabling High-Energy-Density High-Efficiency Ferroelectric Polymer Nanocomposites with Rationally Designed Nanofillers
Enabling High-Energy-Density High-Efficiency Ferroelectric Polymer Nanocomposites with Rationally Designed Nanofillers
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DOI：
10.1002/adfm.202006739
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发表时间：
2020-10-01
影响因子：
19
通讯作者：
Wang, Qing
中科院分区：
文献类型：
--
作者：
Li, He;Yang, Tiannan;Wang, Qing
在已知的聚合物中，铁电聚合物具有最高的介电常数，被认为是高能量密度介电聚合物纳米复合材料的首选基质。尽管铁电聚合物基复合材料已被证明在提高能量密度方面是高效的，但由于铁电聚合物的高本征损耗，充放电效率仍然适中。本文系统地研究了不同介电常数的氧化物纳米填料，揭示了填料与聚合物基质之间的介电匹配对铁电聚合物复合材料电容性能的重要作用。进一步进行了实验和模拟相结合的研究，具体研究了纳米填料形态对聚合物纳米复合材料电学性能的影响。溶液处理后的铁电聚合物纳米复合材料的耐压强度和放电能量密度显著提高，在700 mV m(-1)下的充放电效率高达83.4%，超过了已报道的铁电聚合物和纳米复合材料。这项工作通过利用氧化物填料的介电性能和形态的协同效应，建立了一种简便的制备高性能铁电聚合物复合材料的方法。
Ferroelectric polymers have been regarded as the preferred matrix for high-energy-density dielectric polymer nanocomposites because of their highest dielectric constants among the known polymers. Despite a library of ferroelectric polymer-based composites having been demonstrated as highly efficient in enhancing the energy density, the charge-discharge efficiency remains moderate because of the high intrinsic loss of ferroelectric polymers. Herein, a systematic study of the oxide nanofillers is presented with varied dielectric constants and the vital role of the dielectric match between the filler and the polymer matrix on the capacitive performance of the ferroelectric polymer composites is revealed. A combined experimental and simulation study is further performed to specifically investigate the effect of the nanofiller morphology on the electrica properties of the polymer nanocomposites. The solution-processed ferroelectric polymer nanocomposite embedded with Al2O3 nanoplates exhibits markedly improved breakdown strength and discharged energy density along with an exceptional charge-discharge efficiency of 83.4% at 700 MV m(-1), which outperforms the ferroelectric polymers and nanocomposites reported to date. This work establishes a facile approach to high-performance ferroelectric polymer composites through capitalizing on the synergistic effect of the dielectric properties and morphology of the oxide fillers.