Journal Article

IMPULSE-2025-00096

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A low-cost and high-energy aqueous potassium-ion battery

Streng, R. L. ; Steeger, T. ; Senyshyn, A.MLZ* ; Abel, S. ; Schneider, P. ; Benning, C. ; Naranjo, B. M. ; Gryc, D. ; Hussain, M. Z. ; Lieleg, O. ; Elsner, M. ; Bandarenka, A. S. (Corresponding author) ; Cicvarić, K.

2025
Elsevier Amsterdam [u.a.]

Please use a persistent id in citations: doi:10.1016/j.jechem.2025.02.039

Abstract: o address challenges related to the intermittency of renewable energy sources, aqueous potassium-ion batteries (AKIBs) are a promising and sustainable alternative to conventional systems for large-scale energy storage. To enable their practical application, maximizing energy density and longevity while minimizing production and material costs is a key goal. In this work, we propose an AKIB consisting only of abundant and cost-efficient materials, which delivers a high energy density of more than 70 Wh kg−1. We combine simple strategies to stabilize the Mn-rich Prussian blue analog cathode by Fe-doping, improving the crystallinity, and tuning the electrolyte composition without employing expensive water-in-salt electrolytes. Using a mixed 2.5 M Ca(NO3)2 + 1.5 M KNO3 electrolyte, we assemble a novel AKIB with a Fe-doped manganese hexacyanoferrate cathode and an organic poly(naphthalene-4-formyl-ethylenediamine) anode. Besides a high energy density, the full cell delivers a specific capacity of approximately 60 mA h g−1, a power density of 5000 W kg−1, and 80% capacity retention after 600 cycles.

Keyword(s): Energy (1st) ; Condensed Matter Physics (2nd)

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Contributing Institute(s):

1. STRUCTURE (STRUCTURE)
2. SPODI (SPODI)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2025

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Database coverage:
; Clarivate Analytics Master Journal List ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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