Journal
CHEMSUSCHEM
Volume 14, Issue 4, Pages 1166-1175Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202002628
Keywords
batteries; insertion materials; ionic diffusion; potassium; Prussian blue analogues
Funding
- MEXT program ESICB [JPMXP0112101003]
- JST through the A-STEP program [JPMJTS1611]
- JSPS KAKENHI [JP16K14103, JP16H04225, JP18K14327, JP20J13077]
- JSPS
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Potassium manganese hexacyanoferrate (KMnHCF) can be used as a positive electrode for potassium-ion batteries due to its high energy density. The performance of KMnHCF in terms of capacity and rate capability is influenced by particle size and anion vacancies. Anion vacancies contribute to the enhancement of K+ ion diffusion and ultimately improve the electrochemical performance of KMnHCF.
Potassium manganese hexacyanoferrate (KMnHCF) can be used as a positive electrode for potassium-ion batteries because of its high energy density. The effect of particle size and [Fe(CN)(6)](n-) vacancies on the electrochemical potassium insertion of KMnHCFs was examined through experimental data and theoretical calculations. When nearly stoichiometric KMnHCF was synthesized and tested, smaller particle sizes were found to be important for achieving superior electrochemical performance in terms of capacity and rate capability. However, even in the case of larger particles, introducing a suitable number of anion vacancies enabled KMnHCF to exhibit comparable electrode performance. Electrochemical tests and density functional theory calculations indicated that anion vacancies contribute to the enhancement of K+ ion diffusion, which realizes good electrochemical performance. Structural design, including crystal vacancies and particle size, is the key to their high performance as a positive electrode.
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