Enhancing the energy storage performance of PVDF films through optimized hot-pressing temperatures

IF 2.4 4区化学 Q3 CHEMISTRY, PHYSICAL Ionics Pub Date : 2024-07-11 DOI:10.1007/s11581-024-05692-1

Jiajian Yuan, Haiyan Chen, Hang Luo

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Abstract

Poly(vinylidene fluoride) (PVDF) polymers have garnered significant interest due to their dielectric tunability and applications in micro-electric high-power systems. However, the relationship between structure and energy storage performance is not yet fully illustrated, particularly regarding the fabrication process. Herein, the influence of hot-pressing temperature on the structural and electrical properties were systematically studied, and the optimal temperature was also determined. PVDF films after hot-pressing at 150 ℃ exhibited a high discharged energy density (ESD) of 19.24 J/cm³, coupled with a large breakdown strength (E_b) of 604.08 kV/mm and a high efficiency (η) of 68.99%. The primary contribution to the improved ESD originates from the enhanced crystallinity resulting from the formation of more α-phase and γ-phase structures. Concurrently, the decrease in defects can also promote the enhancement of breakdown strength. This work can provide valuable insights into the optimization of the fabrication process to achieve superior energy storage performance in PVDF films.

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通过优化热压温度提高 PVDF 薄膜的储能性能

聚偏二氟乙烯（PVDF）聚合物因其介电可调性和在微电大功率系统中的应用而备受关注。然而，结构与储能性能之间的关系尚未得到充分说明，尤其是在制造工艺方面。本文系统研究了热压温度对结构和电学性能的影响，并确定了最佳温度。150 ℃热压后的 PVDF 薄膜表现出 19.24 J/cm3 的高放电能量密度 (ESD)、604.08 kV/mm 的高击穿强度 (Eb) 和 68.99% 的高效率 (η)。提高 ESD 的主要原因是形成了更多的α相和γ相结构，从而提高了结晶度。同时，缺陷的减少也会促进击穿强度的提高。这项研究为优化制造工艺以实现 PVDF 薄膜的卓越储能性能提供了宝贵的见解。

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来源期刊

Ionics 化学-电化学

CiteScore

5.30

自引率

7.10%

发文量

427

审稿时长

2.2 months

期刊介绍： Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.