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首页> 外文期刊>Advanced energy materials >Polymer Nanocomposites with Interpenetrating Gradient Structure Exhibiting Ultrahigh Discharge Efficiency and Energy Density
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Polymer Nanocomposites with Interpenetrating Gradient Structure Exhibiting Ultrahigh Discharge Efficiency and Energy Density

机译：聚合物纳米复合材料具有互穿梯度结构，其呈现超高放电效率和能量密度

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摘要

Poly(vinylidene fluoride) (PVDF) based polymer nanocomposites with high-permittivity nanofillers exhibit outstanding dielectric energy storage performance due to their high dielectric permittivities and breakdown strength. However, their discharge efficiency is relatively low (usually lower than 70%), which limits their practical applications. Here, polymer nanocomposites with a novel interpenetrating gradient structure are designed and demonstrated by cofilling a PVDF matrix with barium zirconate titanate nanofibers and hexagonal boron nitride nanosheets via modified nonequilibrium processing. The interpenetrating gradient structure is highly effective in breaking the trade-off between discharge energy density and efficiency of the corresponding nanocomposite, as indicated by the concomitantly enhanced discharge energy density (U-e approximate to 23.4 J cm(-3)) and discharge efficiency (eta approximate to 83%). The superior performance is primarily attributed to the rational distribution of nanofillers in the polymer matrix, which raises the height of the potential barrier for charge injection at the dielectric/electrode interface, suppresses electric conduction and contributes to enhanced apparent breakdown strength. Meanwhile, the gradient configuration allows higher volume fraction of high-permittivity nanofillers without compromising the breakdown strength, leading to higher electric polarization compared with the random configuration. This work provides new opportunities to PVDF-based polymer nanocomposites with high energy density and discharge efficiency for capacitive energy storage applications.
机译：具有高介电常数纳米填料的聚（偏二氟乙烯）（PVDF）的聚合物纳米复合材料由于其高介电介电性和击穿强度而具有出色的介电能量存储性能。然而，它们的放电效率相对较低（通常低于70％），这限制了它们的实际应用。这里，通过将PVDF基质与锆钛酸钡纳米纤维和六边形氮化硼纳米蛋白通过改性非纤维加工来设计和证明具有新型渗透梯形梯度结构的聚合物纳米复合材料。相应的纳米复合材料的放电能量密度和效率之间的互进梯度结构非常有效地破坏折衷，如伴随的放电能量密度（UE近似为23.4JCm（-3））和放电效率（ETA近似为83％）。优异的性能主要归因于聚合物基质中纳米填充物的合理分布，其在电介质/电极界面处提高电荷注射的电位屏障的高度，抑制电导，并有助于提高表观折断强度。同时，梯度配置允许高介电常数纳米填充物的较高体积分数而不损害击穿强度，导致与随机配置相比更高的电极化。这项工作为PVDF的聚合物纳米复合材料提供了具有高能量密度和电容性能存储应用的放电效率的新机遇。

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  • 来源
    《Advanced energy materials》 |2019年第15期|1803411.1-1803411.9|共9页
  • 作者

    Jiang Jianyong; Shen Zhonghui; Cai Xingke; Qian Jianfeng; Dan Zhenkang; Lin Yuanhua; Liu Bilu; Nan Ce-Wen; Chen Longqing; Shen Yang;

  • 作者单位

    Tsinghua Univ Sch Mat Sci & Engn State Key Lab New Ceram & Fine Proc Beijing 100084 Peoples R China;

    Tsinghua Univ Sch Mat Sci & Engn State Key Lab New Ceram & Fine Proc Beijing 100084 Peoples R China;

    Tsinghua Univ Tsinghua Berkeley Shenzhen Inst Shenzhen Geim Graphene Ctr Shenzhen 518055 Peoples R China;

    Tsinghua Univ Sch Mat Sci & Engn State Key Lab New Ceram & Fine Proc Beijing 100084 Peoples R China;

    Tsinghua Univ Sch Mat Sci & Engn State Key Lab New Ceram & Fine Proc Beijing 100084 Peoples R China;

    Tsinghua Univ Sch Mat Sci & Engn State Key Lab New Ceram & Fine Proc Beijing 100084 Peoples R China;

    Tsinghua Univ Tsinghua Berkeley Shenzhen Inst Shenzhen Geim Graphene Ctr Shenzhen 518055 Peoples R China;

    Tsinghua Univ Sch Mat Sci & Engn State Key Lab New Ceram & Fine Proc Beijing 100084 Peoples R China;

    Tsinghua Univ Sch Mat Sci & Engn State Key Lab New Ceram & Fine Proc Beijing 100084 Peoples R China|Penn State Univ Dept Mat Sci & Engn University Pk PA 16802 USA;

    Tsinghua Univ Sch Mat Sci & Engn State Key Lab New Ceram & Fine Proc Beijing 100084 Peoples R China|Tsinghua Univ Ctr Flexible Elect Technol Beijing 100084 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    BN nanosheets; charge injection; discharge efficiency; gradient structure; PVDF;

    机译：BN Nanosheet;充电注射;放电效率;梯度结​​构;PVDF;

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