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Issue 44, 2018
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High rate and stable symmetric potassium ion batteries fabricated with flexible electrodes and solid-state electrolytes

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Abstract

Aqueous batteries designed with K-ions have outstanding potential for future energy storage applications. When coupled with cathode and anode materials both operating with the intercalation mechanism, K-ion batteries could have kinetics and stability similar to Li-ion batteries in principle but with a much lower cost. However, the electrode materials developed so far still suffer from poor stability and limited activity, especially from the anode side. Herein, a new concept of symmetric K-ion batteries was developed by using potassium Prussian blue (KPB) as a bipolar material. The KPB particles were grown on flexible and strong wiper cloth substrates that were pre-coated with polypyrrole (PPy). The use of PPy as an interlayer not only boosted electrical conductivity but also ensured uniform growth of KPB particles. The synthesized KPB@PPy@wiper electrodes have superior flexibility and stability, and exhibited two redox pairs both with remarkable kinetics. When used as bipolar electrodes in combination with a gel solid-state electrolyte, they delivered a well-defined discharge voltage plateau at ∼0.6 V with superior rate capability and cycling stability. This work could provide new insights into the design of K-ion batteries, and give new options for developing flexible solid-state devices.

Graphical abstract: High rate and stable symmetric potassium ion batteries fabricated with flexible electrodes and solid-state electrolytes

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Supplementary files

Article information


Submitted
06 Sep 2018
Accepted
14 Oct 2018
First published
15 Oct 2018

Nanoscale, 2018,10, 20754-20760
Article type
Paper

High rate and stable symmetric potassium ion batteries fabricated with flexible electrodes and solid-state electrolytes

K. Lu, H. Zhang, S. Gao, Y. Cheng and H. Ma, Nanoscale, 2018, 10, 20754
DOI: 10.1039/C8NR07268J

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