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

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 device

SUBMITTER: Xu Z 

PROVIDER: S-EPMC6662075 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature