Chemical adsorption on 2D dielectric nanosheets for matrix free nanocomposites with ultrahigh electrical energy storage
Chemical adsorption on 2D dielectric nanosheets for matrix free nanocomposites with ultrahigh electrical energy storage
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二维介电纳米片上的化学吸附用于具有超高电能存储的无基质纳米复合材料
DOI：
10.1016/j.scib.2021.10.011
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发表时间：
2022-03-17
期刊：
影响因子：
18.9
通讯作者：
Huang, Xingyi
中科院分区：
文献类型：
--
作者：
Chen, Jie;Shen, Zhonghui;Huang, Xingyi
弛豫型铁电聚合物由于其优异的柔韧性、重量轻和高介电常数等优点，在电容器介质中显示出巨大的应用潜力。然而，它们的电能存储容量受到它们的高传导损耗和低介电强度的限制，这主要源于介电聚合物的冲击电离诱导的电子倍增、低机械模量和低热导率。在这里，开发了无基质策略以有效地抑制电子倍增效应并提高介电聚合物的机械模量和热导率，其涉及通过化学吸附含氨基聚合物在氮化硼纳米片表面上化学吸附电子阻挡层。在100 MV m（-1）下，纳米复合材料的漏电流从2.4 × 10（-6）A cm（-2）显著降低到1.1 × 10（-7）A cm（-2），击穿强度从340 MV m（-1）显著提高到742 MV m（-1），放电能量密度从5.2 J cm（-3）显著提高到31.8 J cm（-3）。此外，遭受电击穿的纳米复合材料的介电强度可以恢复到原始值的88%。这项研究表明，一个合理的设计，制造介电聚合物纳米复合材料，大大提高了电能存储容量。(C)中国科学出版社.由爱思唯尔公司和科学中国出版社出版。All rights reserved.
Relaxor ferroelectric polymers display great potential in capacitor dielectric applications because of their excellent flexibility, light weight, and high dielectric constant. However, their electrical energy storage capacity is limited by their high conduction losses and low dielectric strength, which primarily originates from the impact-ionization-induced electron multiplication, low mechanical modulus, and low thermal conductivity of the dielectric polymers. Here a matrix free strategy is developed to effectively suppress electron multiplication effects and to enhance mechanical modulus and thermal conductivity of a dielectric polymer, which involves the chemical adsorption of an electron barrier layer on boron nitride nanosheet surfaces by chemically adsorbing an amino-containing polymer. A dramatic decrease of leakage current (from 2.4 x 10(-6) to 1.1 x 10(-7) A cm(-2) at 100 MV m(-1)) and a substantial increase of breakdown strength (from 340 to 742 MV m(-1)) were achieved in the nanocompostes, which result in a remarkable increase of discharge energy density (from 5.2 to 31.8 J cm(-3)). Moreover, the dielectric strength of the nanocomposites suffering an electrical breakdown could be restored to 88% of the original value. This study demonstrates a rational design for fabricating dielectric polymer nanocomposites with greatly enhanced electric energy storage capacity. (C) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.