材料科学
电介质
复合数
电容器
氟化物
储能
功率密度
复合材料
纳米技术
化学工程
电压
光电子学
电气工程
无机化学
功率(物理)
化学
物理
工程类
量子力学
作者
Tongguang Zhu,Hang Zhao,Na Zhang,Chuying Zhang,Lei Yin,Zhi‐Min Dang,Jinbo Bai
标识
DOI:10.1002/aenm.202203587
摘要
Abstract Dielectric capacitors are fundamental energy storage components in electronics and electric power systems due to their unique ultrahigh power density. However, their relatively low energy storage density is a long‐standing challenge which greatly limits their practical application range. Chitosan (CS) and montmorillonite (MMT) are two kinds of materials that exist abundantly on the earth with natural surface charges. The positively charged CS and negatively charged MMT can be self‐assembled into the typical sandwich‐structured CS/MMT/CS 2D structure through an electrostatic attraction. Loading these surface‐charged sandwich‐structured nanosheets into poly(vinylidene fluoride)‐based composite with a weight fraction as tiny as 0.3 wt.%, an ultrahigh energy storage density of 32.5 J cm −3 accompanied with a high efficiency of 64% are concurrently achieved with a very low cost and scalable process. Guided by finite element simulation, it is revealed that a number of electric potential wells that exist in the charged sandwich nanosheets impede the acceleration of internal charges and hinder the growth of electrical trees. The results offer a novel paradigm for exploring ultrahigh energy storage density capacitors in an economical way.
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