A polymeric cathode-electrolyte interface enhances the performance of MoS2-graphite potassium dual-ion intercalation battery

Study of the influence of the formation protocol on the SEI layer formed at the graphite electrode surface of a non-aqueous potassium-ion hybrid supercapacitor (KIC) through STEM and XPS analyses

“…The spectrum of the P 2p orbital presents three doublets with main peaks at 131, 133, and 136 eV respectively. The two higher energy doublets are related to the presence of KPF 6 salt or K x -PO y F z derived compounds 25 as observed in the F 1s orbital spectrum. The last lower energy contribution for the P 2p orbital could be attributed to polyphosphates.…”

Spreading the Landscape of Dual Ion Batteries: from Electrode to Electrolyte

“…recently reported that a lithium difluoride (oxalate) borate salt additive (LiDFOB) in 3 m LiPF 6 enhanced the stability of the CEI layer, and the cell maintained nearly 88 % capacity after 4k cycles at 0.5 A g −1 [177] . Asfaw and Kotronia demonstrated that the addition of a 6 m KTFSI/DMC electrolyte with triallyl phosphate (TAP) monomer to the 6 m KTFSI/DMC electrolyte improved the performance of the potassium‐based DIB, increasing the CE of the cell to 97–99 % [178] . Other additives used in DIBs include fluoroethylene carbonate (FEC), [179] tetraethylammonium tetrafluoroborate [TEABF(4)] additives, [180] lithium nitrate (LiNO 3 ) additive, [181] ethylene sulfite(ES), [182] vinylidene carbonate (VC), [183] and so on.…”

“…[177] Asfaw and Kotronia demonstrated that the addition of a 6 m KTFSI/DMC electrolyte with triallyl phosphate (TAP) monomer to the 6 m KTFSI/DMC electrolyte improved the performance of the potassium-based DIB, increasing the CE of the cell to 97-99 %. [178] Other additives used in DIBs include fluoroethylene carbonate (FEC), [179] tetraethylammonium tetrafluoroborate [TEABF(4)] additives, [180] lithium nitrate (LiNO 3 ) additive, [181] ethylene sulfite(ES), [182] vinylidene carbonate (VC), [183] and so on. Of course, the number of additives in the electrolyte can have an impact on the performance of DIBs.…”

Impact of Binders on Self-Discharge in Graphite Dual-Ion Batteries

“…The SEI formed on graphite anodes cycled in electrolytes based on LiPF 6 and carbonate solvents is unarguably the most well-studied interphase and a main contributor to the commercialization of LIBs [12]. On the contrary, CEI-studies on graphite cathodes remain still scarce [13][14][15][16][17][18][19][20][21].…”