Low‐Temperature Resistant Stretchable Micro‐Supercapacitor Based on 3D Printed Octet‐Truss Design (original) (raw)

Small, 2023

Abstract

Recently, stretchable micro‐supercapacitors (MSCs) that can be easily integrated into electronic devices have attracted research and industrial attentions. In this work, three‐dimensional (3D) stretchable MSCs with an octet‐truss electrode (OTE) design have been demonstrated by a rapid digital light processing (DLP) process. The 3D‐printed electrode structure is beneficial for electrode‐electrolyte interface formation and consequently increases the number of ions adsorbed on the electrode surface. The designed MSCs can achieve a high capacitance as ≈74.76 mF cm−3 under 1 mA cm−3 at room temperature even under a high mechanical deformation, and can achieve 19.53 mF cm−3 under 0.1 mA cm−3 at a low temperature (−30 °C). Moreover, finite element analysis (FEA) reveals the OTE structure provides 8 times more contact area per unit volume at the electrode‐electrolyte interface compared to the traditional interdigital electrode (IDE). This work combines structural design and 3D printing techniques, which provides new insights into highly stretchable MSCs for next‐generation electronic devices.

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