The combined first principles and experimental study of O-doped KMnF3 as a cathode for potassium-ion batteries

Exploration of Nanoporous CuBi Binary Alloy for Potassium Storage

“…KMnOF@C was synthesized via a coprecipitation method following the previous report. [ 45 ] After paired with NPCuBi anode, the cell shows a capacity of 45.2 mA h g −1 after 20 cycles at 100 mA g −1 (Figure S22, Supporting Information), indicating some practical potentials of NPCuBi anodes in PIBs.…”

“…The carbon‐coated O‐doped KMnF (KMnOF@C) cathode was fabricated according to the previous report. [ 45 ] Full cell was assembled with the cycled NPCuBi anode (5 cycles at 20 mA g −1 ) and KMnOF@C cathode to evaluate the practical performance. All the assembly processes were in an argon‐filled glove box (Mbraun, German), with the concentrations of moisture and oxygen below 0.1 ppm.…”

Ultra-stable potassium storage and hybrid mechanism of perovskite fluoride KFeF3/rGO

“…† Compared to the sodium storage behavior of KFeF 3 , [15][16][17] the CV curves in PIBs are rather smooth without sharp peaks because of the larger ion radius of K + , which is consistent with the results reported in the literature. 21,27,28 The CV curves of KFeF 3 -PVA-500 and KFeF 3 -500 show the same characteristics (Fig. S5b and c †).…”

“…On the other hand, the potassium storage mechanism of AMF 3 cathodes is not yet clear despite some attempts being reported. 15,[18][19][20][21] In this work, we synthesized the perovskite fluoride KFeF 3 through a facile solvothermal method, and the particle size was successfully regulated to the nanoscale by the addition of ascorbic acid (VC). Apart from this, in situ and ex situ carbon composites are achieved to further improve the electronic conductivity and inhibit the growth of grains to some extent.…”

Solid‐State Post Li Metal Ion Batteries: A Sustainable Forthcoming Reality?

“…[ 161 ] An example of theoretically guided cathode design can be found in the perovskite‐like KMnF 3 , where calculations have shown that O‐doping increases the electrical conductivity and lowers K migration barriers: synthesized KMnO 0.125 F 2.875 presented actually high capacities and its structure and electrochemical properties as well as its stability with respect to Mn dissolving in the electrolyte were enhanced through carbon coating. [ 162 ] DFT has been used to shed light also on K ion diffusion barriers and migration pathways in KVOPO 4 [ 163 ] and K x V 2 O 5 , [ 164 ] and on their electronic and structural changes during potassiation. As for KIBs electrolytes, first‐principles MDs have been applied to reveal the solvation structure and dynamic properties of K in EC electrolytes, and the stability window for electrolyte oxidation/reduction by computing the HOMO/LUMO energies.…”