Direct Structure-Performance Comparison of All-Carbon Potassium and Sodium Ion Capacitors.

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ID: 11488
2019
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Ranked #23 of 57 articles by views in Advanced science (Weinheim, Baden-Wurttemberg, Germany)

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Abstract
A hybrid ion capacitor (HIC) based on potassium ions (K) is a new high-power intermediate energy device that may occupy a unique position on the Ragone chart space. Here, a direct performance comparison of a potassium ion capacitor (KIC) versus the better-known sodium ion capacitor is provided. Tests are performed with an asymmetric architecture based on bulk ion insertion, partially ordered, dense carbon anode (hard carbon, HC) opposing N- and O-rich ion adsorption, high surface area, cathode (activated carbon, AC). A classical symmetric "supercapacitor-like" configuration AC-AC is analyzed in parallel. For asymmetric K-based HC-AC devices, there are significant high-rate limitations associated with ion insertion into the anode, making it much inferior to Na-based HC-AC devices. A much larger charge-discharge hysteresis (overpotential), more than an order of magnitude higher impedance , and much worse cyclability are observed. However, K-based AC-AC devices obtained on-par energy, power, and cyclability with their Na counterpart. Therefore, while KICs are extremely scientifically interesting, more work is needed to tailor the structure of  "Na-inherited" dense carbon anodes and electrolytes for satisfactory K ion insertion. Conversely, it should be possible to utilize many existing high surface area adsorption carbons for fast rate K application.
Reference Key
xu2019directadvanced Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Xu, Ziqiang;Wu, Mengqiang;Chen, Zhi;Chen, Cheng;Yang, Jian;Feng, Tingting;Paek, Eunsu;Mitlin, David;
Journal Advanced science (Weinheim, Baden-Wurttemberg, Germany)
Year 2019
DOI
10.1002/advs.201802272
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