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

Abstract

Potassium-ion batteries (PIBs) are promising for large-scale energy storage due to the abundant reserves of element potassium yet few satisfactory cathode materials have been developed due to the limitation by...

Advancements in cathode materials for potassium-ion batteries: current landscape, obstacles, and prospects

“…Cathode materials for KIBs can be classified broadly into four main groups: (i) Prussian analogues, [24][25][26][27][28][29] (ii) organic compounds, (iii) polyanion-based compounds, and (iv) layered oxides and chalcogenides. [104][105][106][107][108][109] In addition, perovskite compounds (such as K(Mn 0.95 Ni 0.05 )F 3 ), conversion compounds (such as CuSO 4 ) and tunnel-structured compounds (such as cryptomelane-type KMn 8 O 16 ) have emerged, [110][111][112][113] albeit less explored. Fig.…”

High‐Entropy Perovskites for Energy Conversion and Storage: Design, Synthesis, and Potential Applications

“…[ 178 ] The initial battery discharge capacity of 180 mAh g −1 did not decay significantly during 60 charge/discharge cycles, achieving 173 mAh g −1 (Figure 11f). In addition, perovskite materials, including KFeF 3 , [ 179 ] K(Mn 0.95 Ni 0.05 )F 3 , [ 180 ] and LaMnO 3 , [ 181 ] have been reported as potential high‐performance K‐ and Zn‐ion battery electrodes. However, conventional perovskite electrodes usually cannot achieve long‐term‐stable cycling because of their inherent structural instability.…”

YF3 with Nanostructure: A Rare Earth Metal Fluoride Anode for Lithium‐Ion Batteries

“…Current density Cycles Specific capacity FeF 3 • 0.33H 2 O @NSPC [39] 0.04 A g À 1 100 164.5 mAh g À 1 FeF 2 @MHCS [40] 0.03 A g À 1 100 220 mAh g À 1 KFeF 3 /rGO-PVA [41] 0.05 A g À 1 300 74 mAh g À 1 KCuF 3 [42] 0.1 A g À 1 10 65.6 mAh g À 1 YF 3 (this work) 0.1 A g À 1 2000 148.5 mAh g À 1 gresses (Figure 5c). The half-cell impedance before and after cycling was fitted, and R s in the fitted results represents the electrolyte impedance, R ct + sf represents the charge impedance and the interfacial impedance between the electrode and the electrolyte.…”