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首页> 外文期刊>Advanced energy materials >High Energy Density Polymer Dielectrics Interlayered by Assembled Boron Nitride Nanosheets
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High Energy Density Polymer Dielectrics Interlayered by Assembled Boron Nitride Nanosheets

机译：通过组装硼氮化物纳米晶片中夹层的高能量密度聚合物电介质

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摘要

Polymer dielectrics such as poly(vinylidene fluoride) (PVDF) have drawn tremendous attention in high energy density capacitors because of their high dielectric constant and ease of processing. However, the discharged energy density attained with these materials is restrained by the inferior breakdown strength and electric resistivity. Herein, PVDF composite films with a nanosized interlayer of assembled boron nitride nanosheets (BNNSs) that is aligned along the in-plane direction are prepared through a simple layer-by-layer solution-casting process. Compared to the pristine PVDF, the composite films show remarkably suppressed leakage current, resulting in a high breakdown strength and a superior energy density which are 136% and 275%, respectively, that of the pristine PVDF. The experimental results and computational simulations reveal that the compact and successive interlayer of assembled BNNSs can largely mitigate the local field distortion and block the propagation of electrical treeing, which is advantageous over the conventional dielectric polymer nanocomposites. Notably, unlike the previous dielectric polymer nanocomposites that are usually incorporated with a high volume fraction of nanofillers, i.e., 5-10 vol%, the present composites contain only an extremely low content of nanfillers, e.g., 0.16 vol%. These findings offer a novel paradigm for fabricating high energy density and high efficiency polymer dielectrics.
机译：由于其高介电常数和易于加工，聚合物电介质如聚（偏二氟乙烯）（PVDF）（PVDF）在高能量密度电容器中引起了巨大的关注。然而，通过这些材料获得的排出能量密度受到较差的击穿强度和电阻率。这里，通过简单的逐层溶液浇铸方法制备具有沿面内方向对准的组装氮化硼纳米片（BNNS）的纳米叠层的PVDF复合膜。与原始PVDF相比，复合膜显着抑制了漏电流，导致高击穿强度和优异的能量密度，分别是原始PVDF的136％和275％。实验结果和计算模拟表明，组装BNNS的紧凑型和连续的层间可以在很大程度上减轻局部场失真并阻止电岭的传播，这有利于传统的介电聚合物纳米复合材料。值得注意的是，与先前的介电聚合物纳米复合材料不同，通常掺入纳米填料的大容量级分，即5-10体积％，本复合材料仅含有极低的纳入含量，例如，0.16 Vol％。这些发现提供了一种用于制造高能量密度和高效聚合物电介质的新型范式。

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  • 来源
    《Advanced energy materials》 |2019年第36期|1901826.1-1901826.10|共10页
  • 作者

    Zhu Yingke; Zhu Yujie; Huang Xingyi; Chen Jin; Li Qi; He Jinliang; Jiang Pingkai;

  • 作者单位

    Shanghai Jiao Tong Univ Dept Polymer Sci & Engn Shanghai Key Lab Elect Insulat & Thermal Ageing State Key Lab Met Matrix Composites Shanghai 200240 Peoples R China;

    Tsinghua Univ State Key Lab Power Syst Dept Elect Engn Beijing 100084 Peoples R China;

    Shanghai Jiao Tong Univ Dept Polymer Sci & Engn Shanghai Key Lab Elect Insulat & Thermal Ageing State Key Lab Met Matrix Composites Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ Dept Polymer Sci & Engn Shanghai Key Lab Elect Insulat & Thermal Ageing State Key Lab Met Matrix Composites Shanghai 200240 Peoples R China;

    Tsinghua Univ State Key Lab Power Syst Dept Elect Engn Beijing 100084 Peoples R China;

    Tsinghua Univ State Key Lab Power Syst Dept Elect Engn Beijing 100084 Peoples R China;

    Shanghai Jiao Tong Univ Dept Polymer Sci & Engn Shanghai Key Lab Elect Insulat & Thermal Ageing State Key Lab Met Matrix Composites Shanghai 200240 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    boron nitride nanosheets; breakdown strength; efficiency; energy density;

    机译：硼氮化物纳米片;击穿强度;效率;能量密度;

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