A 2.5 V In‐Plane Flexi‐Pseudocapacitor with Unprecedented Energy and Cycling Efficiency for All‐Weather Applications

Author:

Yadav Prahlad1,Samanta Ketaki2,Arya Vinay3,Biswas Diptesh3,Kim Hun‐Seong4,Bakli Chirodeep3ORCID,Jung Hyun Young45ORCID,Ghosh Debasis15ORCID

Affiliation:

1. Centre for Nano and Material Sciences JAIN (Deemed to be University) Kanakapura Road Bangalore Karnataka 562112 India

2. Department of Materials Engineering Indian Institute of Science Bangalore Karnataka 560012 India

3. Thermofluidics and Nanotechnology for Sustainable Energy Systems Laboratory, School of Energy Science and Engineering Indian Institute of Technology Kharagpur Kharagpur West Bengal 721302 India

4. Department of Energy System Engineering Gyeongsang National University Jinju‐si Gyeongnam 52725 South Korea

5. Department of Energy Engineering Gyeongsang National University Jinju‐si Gyeongnam 52725 South Korea

Abstract

AbstractAs electronic devices for aviation, space, and satellite applications become more sophisticated, built‐in energy storage devices also require a wider temperature spectrum. Herein, an all‐climate operational, energy and power‐dense, flexible, in‐plane symmetric pseudocapacitor is demonstrated with utmost operational safety and long cycle life. The device is constructed with interdigital‐patterned laser‐scribed carbon‐supported electrodeposited V5O12·6H2O as a binder‐free electrode and a novel high‐voltage anti‐freezing water‐in‐salt‐hybrid electrolyte. The anti‐freezing electrolyte can operate over a wide temperature range of −40–60 °C while offering a stable potential window of ≈2.5 V. The device undergoes rigorous testing under diverse environmental conditions, including rapid and regular temperature and mechanical transition over multiple cycles. Additionally, detailed theoretical simulation studies are performed to understand the interfacial interactions with the active material as well as the local behavior of the anti‐freeze electrolyte at different temperatures. As a result, the all‐weather pseudocapacitor at 1 A g−1 shows a high areal capacitance of 234.7 mF cm−2 at room temperature and maintains a high capacitance of 129.8 mF cm−2 even at −40 °C. Besides, the cell operates very reliably for over 80 950 cycles with a capacitance of 25.7 mF cm−2 at 10 A g−1 and exhibits excellent flexibility and bendability under different stress conditions.

Funder

National Research Foundation of Korea

Publisher

Wiley

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