High Dielectric Constant Polycarbonate/Nylon Multilayer Films Capacitors with Self-Healing Capability
High Dielectric Constant Polycarbonate/Nylon Multilayer Films Capacitors with Self-Healing Capability
复制标题
DOI：
10.1021/acsapm.9b00099
复制
发表时间：
2019-04-01
影响因子：
5
通讯作者：
Zhu, Lei
中科院分区：
文献类型：
--
作者：
Li, Zhenpeng;Chen, Xinyue;Zhu, Lei
随着用于电动汽车电力电子的高温金属氧化物半导体场效应晶体管的快速发展，目前最先进的双向拉伸聚丙烯（BOPP）薄膜电容器需要进一步改进，因为它们的额定温度仅为85摄氏度，而不会降低电压以保持长寿命。如果高温聚合物能够在不牺牲整体介电性能和成本的前提下替代BOPP，就有可能去除目前电容器的水冷系统，大幅降低电力电子单元的成本。在这项工作中，我们展示了新的聚碳酸酯（PC）/尼龙多层膜（MLF），由于尼龙的熔融温度较高，因此具有甚至更高的温度等级的潜力（例如，尼龙-6）。结构和介电研究表明，这些PC/尼龙MLFs具有类似的介电性能，如介电常数，介电损耗和击穿强度，作为PC/聚（偏二氟乙烯）PVDF MLFs，这是在过去开发的。这些PC/尼龙MLF可以在高达120 ℃的温度下表现良好，这受到PC玻璃化转变温度145 ℃的限制。更有趣的是，封装的PC/尼龙-12 MLF电容器表现出自愈能力，这对于封装的高温薄膜电容器来说是困难的。由于自修复是聚合物薄膜电容器的基本要求，我们的PC/尼龙MLF为下一代高温和高能量密度薄膜电容器提供了潜力。
With the fast development of high-temperature metal oxide semiconductor field effect transistors for power electronics in electric vehicles, current state-of-the-art biaxially oriented polypropylene (BOPP) film capacitors need further improvement because they have a temperature rating of only 85 degrees C without derating the voltage to maintain a long lifetime. If a high-temperature polymer can replace BOPP without sacrificing the overall dielectric performance and cost, it is possible to remove the current water-cooling system for capacitors and significantly reduce the cost of the power electronic unit. In this work, we demonstrated new polycarbonate (PC)/nylon multilayer films (MLFs), which has a potential for even higher temperature rating because of the higher melting temperature for nylons (e.g., nylon-6). Structural and dielectric studies showed that these PC/nylon MLFs had a similar dielectric performance, such as dielectric constant, dielectric loss, and breakdown strength, as the PC/poly(vinylidene fluoride) PVDF MLFs, which were developed in the past. These PC/nylon MLFs could perform well up to 120 degrees C, which was limited by the glass transition temperature of PC at 145 degrees C. More intriguingly, packaged PC/nylon-12 MLF capacitors exhibited a self-healing capability, which had been difficult for packaged high-temperature film capacitors. Because self-healing is such a fundamental requirement for polymer film capacitors, our PC/nylon MLFs offer a potential for next generation high-temperature and high-energy density film capacitors.