Cooling-Regulated Crystalline Structure for Enhanced High-Temperature Capacitive Energy Storage in PTFE Dielectric Films
- 1Wuzhen Laboratory, Tongxiang 314500, China
- 2School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
Abstract
Polytetrafluoroethylene (PTFE) possesses outstanding thermal stability, low dielectric loss and an excellent insulating property, showing significant application potential in high-performance energy storage film capacitors. However, the conventional natural cooling process after high-temperature heat treatment tends to induce large fibrous crystalline structures accompanied by pores and pits, which limits the energy storage performance of PTFE films at high temperatures. Herein, flexible PTFE films with different crystalline morphologies are prepared by solution casting. By optimizing the cooling process, particularly through ice water bath cooling, crystalline growth is effectively suppressed, leading to a refined, homogeneous and dense crystalline structure. Simulation results demonstrate that the optimized crystalline structure effectively mitigates local electric field distortions, heat accumulation and stress concentration to improve the overall electrical–thermal–mechanical response. Consequently, the PTFE film prepared by ice water bath cooling exhibits an enhanced energy density of 2.33 J/cm3 with an efficiency of 92% at 200 °C under an electric field of 480 MV/m. The present work suggests that regulating the crystalline structure through the cooling process is a simple and low-cost strategy for effectively enhancing the high temperature energy storage performance of polymer dielectric films.
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BibTeX
@article{jiang2026coolingregulated,
title = {{Cooling-Regulated Crystalline Structure for Enhanced High-Temperature Capacitive Energy Storage in PTFE Dielectric Films}},
author = {Jian-Yong Jiang and Jian Wang and Xin Zhen and Hui Zhang and Ming-Yue Ma},
journal = {Polymers},
year = {2026},
month = oct,
doi = {10.3390/polym18212663},
url = {https://www.mdpi.com/2073-4360/18/21/2663},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Cooling-Regulated Crystalline Structure for Enhanced High-Temperature Capacitive Energy Storage in PTFE Dielectric Films
AU - Jian-Yong Jiang
AU - Jian Wang
AU - Xin Zhen
AU - Hui Zhang
AU - Ming-Yue Ma
PY - 2026
DA - 2026/10/28
JO - Polymers
DO - 10.3390/polym18212663
UR - https://www.mdpi.com/2073-4360/18/21/2663
AB - Polytetrafluoroethylene (PTFE) possesses outstanding thermal stability, low dielectric loss and an excellent insulating property, showing significant application potential in high-performance energy storage film capacitors. However, the conventional natural cooling process after high-temperature heat treatment tends to induce large fibrous crystalline structures accompanied by pores and pits, which limits the energy storage performance of PTFE films at high temperatures. Herein, flexible PTFE films with different crystalline morphologies are prepared by solution casting. By optimizing the cooling process, particularly through ice water bath cooling, crystalline growth is effectively suppressed, leading to a refined, homogeneous and dense crystalline structure. Simulation results demonstrate that the optimized crystalline structure effectively mitigates local electric field distortions, heat accumulation and stress concentration to improve the overall electrical–thermal–mechanical response. Consequently, the PTFE film prepared by ice water bath cooling exhibits an enhanced energy density of 2.33 J/cm3 with an efficiency of 92% at 200 °C under an electric field of 480 MV/m. The present work suggests that regulating the crystalline structure through the cooling process is a simple and low-cost strategy for effectively enhancing the high temperature energy storage performance of polymer dielectric films.
SN - 2073-4360
ER -