Double-Bond-induced Morphotropic Phase Boundary leads to Enhanced Electrocaloric Effect in VDF-Based Polymer Flexible Devices

Florian Le Goupil (1, 2) , Konstantinos Kallitsis (1, 2) , Sylvie Tencé-Girault (3, 4) , Cyril Brochon (1, 2) , Eric Cloutet (1, 2) , Guillaume Fleury (1, 2) , Georges Hadziioannou (1, 2)

1 LCPO - Laboratoire de Chimie des Polymères Organiques
2 Team 4 LCPO : Polymer Materials for Electronic, Energy, Information and Communication Technologies
3 Arkema - Arkema
4 PIMM - Laboratoire Procédés et Ingénierie en Mécanique et Matériaux

Electrocaloric (EC) polymers answer the needs for green, efficient, and flexible coolers, as well as thermal management in wearable electronics. A morphotropic phase boundary is induced for the first time in P(VDF-ter-TrFE-ter-CFE) polymers near room temperature, by soft one-pot addition of small fractions of double bonds. It results in flexible devices with remarkable cooling performance, ΔTEC = 5.8 K for E < 100 MV•m-1 and up to 9.3 K at higher fields, which are maintained when bent to various angles required for wearable electronics. This work paves the way for the development of scalable, high-performance, flexible organic cooling devices.

Mots clés: electrocaloric effect; relaxor ferroelectrics; phase transitions; polymers; flexible devices; wearable electronics

Domaines: Polymères

Florian Le Goupil, Konstantinos Kallitsis, Sylvie Tencé-Girault, Cyril Brochon, Eric Cloutet, et al.. Double-Bond-induced Morphotropic Phase Boundary leads to Enhanced Electrocaloric Effect in VDF-Based Polymer Flexible Devices. ACS Applied Energy Materials, In press, ⟨10.1021/acsaem.3c02804⟩. ⟨hal-04331844⟩