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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Increasing the Energy Efficiency and Breakdown Strength of High-Energy-Density Polymer Nanocomposites by Engineering the Ba0.7Sr0.3TiO3 Nanowire Surface via Reversible Addition-Fragmentation Chain Transfer Polymerization
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Increasing the Energy Efficiency and Breakdown Strength of High-Energy-Density Polymer Nanocomposites by Engineering the Ba0.7Sr0.3TiO3 Nanowire Surface via Reversible Addition-Fragmentation Chain Transfer Polymerization

机译：通过可逆加成-断裂链转移聚合工程设计Ba0.7Sr0.3TiO3纳米线表面，提高高能量密度聚合物纳米复合材料的能效和击穿强度

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Flexible nanocomposites comprising a dielectric polymer matrix and high-k nanoparticle fillers have shown great potential for power energy storage applications. However, the addition of high-k nanoparticles usually causes low breakdown strength and low energy efficiency of the nanocomposites, which limit their practical applications, particularly at high electric fields. In this work, we report a novel method to enhance the energy storage efficiency and breakdown strength of high-k nanowire (NW)-based poly(vinylidene fluoride-co-hexafluoropropylene) nanocomposites. Ba0.7Sr0.3TiO3 NWS were synthesized by a hydrothermal method, and their surface was grafted with a layer of poly(pentafluorophenyl acrylate) (PPFPA) addition fragmentation chain transfer polymerization. Compared with the addition of as-prepared NWs, the incorporation of PPFPA-encapsulated NWs apparently enhanced the breakdown strength of the nanocomposites. On the other hand, the incorporation of PPFPA-encapsulated NWS results in much lower dielectric loss at low frequencies and higher energy storage efficiency of the nanocomposites. Although the two nanocomposites exhibit comparable discharged energy densities at relatively low electric field (e.g., <200 kV/mm), much higher energy storage capability can be expected in the nanocomposites with PPFPA-encapsulated NWs because of their high breakdown strength.
机译：包含介电聚合物基质和高k纳米粒子填料的柔性纳米复合材料在动力储能应用中显示出巨大潜力。然而，高k纳米粒子的添加通常导致纳米复合材料的低击穿强度和低能量效率，这限制了它们的实际应用，特别是在高电场下。在这项工作中，我们报告了一种新的方法，可以提高基于高k纳米线（NW）的聚（偏二氟乙烯-共六氟丙烯）纳米复合材料的储能效率和击穿强度。通过水热法合成Ba0.7Sr0.3TiO3 NWS，并将其表面接枝一层聚五氟丙烯酸丙烯酸酯（PPFPA）加成断裂链转移聚合反应。与添加已制备的净水相比，PPPFA封装的净水的加入明显增强了纳米复合材料的击穿强度。另一方面，掺入PPPFA封装的NWS导致低频下的介电损耗低得多，纳米复合材料的储能效率更高。尽管两种纳米复合材料在相对较低的电场下（例如，<200 kV / mm）显示出相当的放电能量密度，但是由于它们具有高的击穿强度，因此在具有PPPFA封装的纳米线的纳米复合材料中可以期望更高的能量存储能力。

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