Fluorosulfonamide-type electrolyte additives for long-life K-ion batteries

Abstract

Graphite is a promising negative electrode material for emerging potassium ion batteries (KIBs), offering a good capacity and a low-potential discharge plateau. To date, achieving long cycle life KIBs with...

Restructuring Electrolyte Solvation by a Partially and Weakly Solvating Cosolvent toward High-Performance Potassium-Ion Batteries

“…The SEI composition on the Cu foil after potassium plating was analyzed using X-ray photoelectron spectroscopy (XPS) (Figure S19). As shown in the C 1s spectra, they all exhibit peaks of M–C (283.3 eV) (M for K metal), C–C/CC (284.7 eV), C–O (286.2 eV), and CO (287.9 eV) . High-resolution O 1s XPS results present four peaks: −C–O–K (530.3 eV), CO (531.4 eV), −C–O–C– (532.3 eV), and O–CO (533.5 eV).…”

Impact of electrolyte decomposition products on the electrochemical performance of 4 V class K-ion batteries

“…These products possibly act like other electrolyte additives for KIBs that help the SEI formation and improve the cell performance. 9,17,33…”

“…We chose graphite due to its relatively high density of 2.3 g cm −3 , theoretical capacity of 279 mA h g −1 for KC 8 and low potential for K + insertion. 9,21,22 In the rst cycle, the cells containing an untreated electrolyte exhibited a low reversible capacity (150 mA h g −1 ) and coulombic efficiency (CE) of 68% (Fig. 2a).…”

“…Furthermore, the use of a K + electrolyte is amenable with Al current collectors, which normally reacts to form alloy phases with Li + at a lower potential. Although signicant progress has been made toward developing long cycle life KIBs, researchers continue to look for improved electrode materials [5][6][7][8] and optimize electrolytes 9,10 to attain further improved performance.…”

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

“…Electrolyte optimisation strategies, such as the incorporation of additives like fluoroethylene carbonate (FEC), trimethylene sulphate, 402 ethylene sulphate, potassium difluorophosphate, vinylene carbonate, sulphate esters of 1,3,2-dioxathiolane 2,2-dioxide, 402,403 dimethylsulfamoyl fluoride, 404 1,3-propane sultone, 403 butylene sulphite 403 amongst others, hold immense potential to enhance the electrochemical performance of potassium-ion battery (KIB) electrolytes. Despite their higher cost, FEC stands out as a dominant additive for high-voltage battery electrolytes, attributed to its robust oxidation resistance owing to the fluorine-containing structure.…”