Double enhanced energy storage density via polarization gradient design in ferroelectric poly(vinylidene fluoride)-based nanocomposites
Double enhanced energy storage density via polarization gradient design in ferroelectric poly(vinylidene fluoride)-based nanocomposites
复制标题
通过铁电聚偏二氟乙烯纳米复合材料的极化梯度设计双倍提高能量存储密度
DOI：
10.1016/j.cej.2021.128585
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发表时间：
2021-05
影响因子：
15.1
通讯作者：
Yuan Deng
中科院分区：
文献类型：
--
作者：
Chen Huang;Lingyu Zhang;Song Liu;Yao Wang;Nü Wang;Yuan Deng
将铁电陶瓷纳米填料封装到具有各种结构的聚合物基体中已被证明是超高能量存储密度的有效策略。然而，陶瓷填料和聚合物之间介电常数的巨大差异需要复杂的界面改性以减轻局部电荷集中。在复合材料中设计从填料中心到周围基体的分级介电常数的想法是有前途的，但仍然是一个巨大的挑战。这里采用同轴静电纺丝技术来控制TiO2纳米纤维（TOnf）和聚（偏二氟乙烯）/聚（偏二氟乙烯-三氟乙烯）[PVDF/P(VDF-TrFE)]核-壳结构杂化纳米复合材料体系中的偏振梯度分布，其中TOnfis固定在体积分数2%，并且通过改变PVDF和聚偏二氟乙烯的体积比来调节聚合物的偏振梯度。 P(VDF-TrFE)分别在两层同轴电纺聚合物共混物中。与相同成分体积分数的混合溶液电纺随机取向 TOnf-PVDF/P(VDF-TrFE) 制成的纳米复合材料相比，同轴纺薄膜的介电损耗降低了一倍以上，从随机纳米复合薄膜的 0.087 下降到 0.028，更有趣的是，放电能量存储密度 (Ue) 从随机纳米复合薄膜的 6.5 J cm−3 增加了一倍以上。 12.7 J cm−3 用于中等偏振梯度的同轴电纺薄膜。有限元分析揭示了具有各种极化梯度设计的纳米复合材料中的极化和局部电场分布，结果明确地表明，通过受控极化梯度设计可以显着提高Ue。
Encapsulating ferroelectric ceramic nanofillers into polymer matrix with various architectures has been demonstrated as an effective strategy for ultrahigh energy storage density. Nevertheless, large discrepancy in permittivities between ceramic fillers and polymer requires sophisticated interfacial modification to alleviate local charge concentration. The idea to design graded permittivity from the filler center to surrounding matrix in composites is promising, yet remains a big challenge. Here coaxial electrospinning technique has been employed to control the polarization gradient distribution in TiO2nanofibers (TOnf) and poly(vinylidene fluoride)/poly(vinylidene fluoride-co-trifluoroethylene) [PVDF/P(VDF-TrFE)] core-shell structured hybrid nanocomposites system where TOnfis fixed at volume fraction 2%, and the polarization gradient of the polymer is adjusted via altering the volume ratios of PVDF and P(VDF-TrFE) in the coaxial electrospun polymer blends in two layers, respectively. Compared with nanocomposites made from mixed solution electrospun randomly and oriented TOnf-PVDF/P(VDF-TrFE) at the same constituent volume fraction, the dielectric losses of coaxial-spun films decrease more than twice, from 0.087 for random nanocomposite film to 0.028, and more intriguingly, the discharged energy storage density (Ue) doubled increasing from 6.5 J cm−3for random nanocomposite film to 12.7 J cm−3for coaxial electrospun film with medium polarization gradient. Finite element analyses reveal the polarization and local electric field distribution in the nanocomposites with various polarization gradient design, and the results unambiguously demonstrate thatUecan be significantly boosted via controlled polarization gradient design.
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