Fabrication of cellulose-based dielectric nanocomposite film with excellent energy storage performance via codissolution-regeneration method

Ultrahigh energy storage capacity in multilayer-structured cellulose-based dielectric capacitors caused by interfacial polarization-coupled Schottky barrier height

“…For sandwich-structured ones, both P r and P m increase monotonously with increasing BT content; thus, the same tendency of ESD can also be observed. The decrease of η with increasing BT content is a common phenomenon in polymer composites, 25 and in this work, the confined electrons in the C8P2 matrix enhance this tendency. When compared with their counterparts with uniform structure, both 0-2-0 and 0-5-0 exhibited lower P r , P m , and ESD than those of 2/3-2/3-2/3 and 5/3-5/3-5/3, and the reason is as follows: The polarization triggered by the applied electric field of our multilayers consists of three parts, which are the polarization of the C8P2 matrix ( P C8P2 ), the polarization of BT particles ( P BT ), and the interfacial polarization between C8P2 and BT ( P i ).…”

“…As we have already determined, the mechanical properties of the C8P2 blend film are much better than those of both single-phased cellulose and PVDF films, resulting from hydrogen bond replacement. 25 In this work, we obtained a much better tensile strength in multilayers than in single-layered films. Fig.…”

“…4d illustrates the comparison of the energy storage performance between our multilayers and some typical cellulose-based dielectric lms. [21][22][23]25,[35][36][37][38][39][40][41][42][43] This Work-1 represents the sandwich structured 0-2-0, and This Work-2 is the uniform structured 2/3-2/3-2/3. Though the h of 0-2-0 has fewer advantages among those systems, its ESD is the highest ever reported.…”

“…The blend's mass ratio of cellulose/PVDF is 80/20, which follows our previous work (C8P2). 25 In such a composition, the cellulose can also help to increase the β-phase in PVDF. 29 Since the fillers in dielectric composites are thought to offer the main polarization, we modified the BT particles to improve the energy storage capacity.…”

“…Because the cellulose bers were covered by the PVDF, our lm showed excellent hydrophobicity. 25 The second problem comes from the substantial shrinkage of cellulose lm during the drying process, which is attributed to the selfassembly behavior of the hydrogen-bond network. This makes it almost impossible to cast a second layer, [26][27][28] as sketched in Fig.…”