Ultrahigh charge-discharge efficiency and high energy density of a high-temperature stable sandwich-structured polymer

被引:59
作者
Chen, Hanxi [1 ]
Pan, Zhongbin [1 ,2 ]
Cheng, Yu [1 ]
Ding, Xiangping [1 ]
Liu, Jinjun [1 ]
Chi, Qingguo [2 ]
Yang, Minhao [3 ]
Yu, Jinhong [4 ]
Dang, Zhi-Min [5 ]
机构
[1] Ningbo Univ, Sch Mat Sci & Chem Engn, Ningbo 315211, Zhejiang, Peoples R China
[2] Harbin Univ Sci & Technol, Sch Elect & Elect Engn, Key Lab Engn Dielect & Its Applicat, Minist Educ, Harbin 150080, Peoples R China
[3] North China Elect Power Univ, Inst Adv Mat, 2, Beijing 102206, Peoples R China
[4] Chinese Acad Sci, Univ Chinese Acad Sci, Ningbo Inst Mat Technol & Engn,Zhejiang Key Lab M, Key Lab Marine Mat & Related Technol, Ningbo 315201, Zhejiang, Peoples R China
[5] Tsinghua Univ, Dept Elect Engn, State Key Lab Power Syst, Beijing 100084, Peoples R China
基金
中国国家自然科学基金;
关键词
HIGH-PERMITTIVITY; DIELECTRIC MATERIALS; STORAGE PERFORMANCE; NANOCOMPOSITES; POLYPROPYLENE; COMPOSITES; NANOFIBERS; NANOWIRES; STRENGTH;
D O I
10.1039/d1ta08855f
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A new generation of high-temperature dielectric materials toward capacitive energy storage is highly demanded, as power electronics are always exposed to elevated temperatures in high-power applications. Polymer dielectric materials, as ideal candidates for capacitors, suffer from deteriorated energy density because of their depressed dielectric constant and decreased breakdown strength at high temperatures, which become major barriers for their application in harsh environments. Here, sandwich-structured dielectric polymer nanocomposites with superior high-temperature capacitive performances are reported. Very different from the conventional single-layer designs, such sandwich-structured configurations can integrate the complementary properties of multiple spatially organized components in a synergistic manner, simultaneously raising the dielectric constant and breakdown strength, and subsequently greatly increasing the discharged energy density at elevated temperatures. Further analysis by simulation shows the evolution process of electrical tree channels in the experimental breakdown and dissipation of Joule heating. Consequently, the sandwich-structured polymer nanocomposites deliver an outstanding U-d value of 4.14 J cm(-3), with a eta value of above 90% at 150 degrees C, outperforming the current high-temperature dielectric polymers and composites. This work provides a new design paradigm for high-temperature electrical energy storage applications.
引用
收藏
页码:1579 / 1587
页数:9
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