Symmetrical porous graphitized carbon fabric electrodes for ultra-cryogenic and dendrite-free Zn-ion hybrid supercapacitors

Baolong Sun, Ni Wang, Xingchen Xie, Li Zhong, Lixiang He, Sridhar Komarneni, Wencheng Hu

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Zinc-ion hybrid supercapacitors (ZHSCs) have enormous potential for future applications in electric vehicles, portable/wearable electronic gadgets, etc. However, to accelerate ZHSC technology towards market applications, it is necessary to overcome research challenges such as Zn dendrites, low Zn utilization, and all-climate adaptability, as well as to streamline the device assembly process. In this study, we propose a new strategy for the facile construction of ZHSC via two porous carbon fabrics and a Zn plating solution. The cathode and current collector of the device are both porous graphitized carbon fabric (PGCF) prepared by high-temperature activation of K2FeO4, and the Li2ZnCl4·9H2O electrolyte is verified to possess excellent Zn plating/stripping efficiency and inhibition of Zn dendrite growth in a Zn-Zn symmetric cell model. As a result, the assembled ZHSC has the maximum energy density of 2.02 mWh cm−2 and the highest power density of 11.47 mW cm−2, and it can operate for 30,000 cycles without capacity degradation. Furthermore, the destruction of the hydrogen bonding network by the high concentration of Cl at low temperatures endows it with low freezing point properties and excellent ionic activity at low temperatures. The device also operated reliably at –60 °C, with a maximum areal capacity of 1.15 mAh cm−2. This research offers new findings and insights for the development of high-performance ultra-cryogenic ZHSC devices.

Original languageEnglish (US)
Pages (from-to)251-261
Number of pages11
JournalJournal of Materials Science and Technology
Volume209
DOIs
StatePublished - Feb 20 2025

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Polymers and Plastics
  • Metals and Alloys
  • Materials Chemistry

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