Improvement of the Li metal-electrolyte interfacial stability by cis–trans polar conformer formation in a carbonate electrolyte

Abstract

This work focuses on interfacial engineering by electrolyte modulation, that is, cis–trans polar conformer formation of dimethyl carbonate, as strategy to widen electrochemical stability window, thus improving cycleability of lithium-metal batteries.

Osteoporosis Failure of Aluminum Current Collector Induced Crosstalk Degradation at the Imide-Type Lithium Salt Comprised Practical-Level Lithium-Ion Batteries

“…4a). The ex situ O 1 s XPS spectra reveal similar deposited surface film species (C-O, C=O) in both electrolytes, 16,28,29 indicating that the oxidative decomposition of the electrolyte on the NCM surface was not significantly altered with LiFSI introduction. Therefore, the failure of the positive electrode is not mainly responsible for the sudden capacity deterioration after 600 cycles.…”

“…The advancement of the electrolyte composition for the highperformance lithium secondary batteries are attempted by the new lithium salt introduction, which substitutes typical lithium hexafluorophospate (LiPF 6 ) salt. [1][2][3][4][5][6][7][8][9][10][11] The incorporation of newly designed lithium salts typically enhances the ionic conductivity and transference number of lithium ions, as well as the chemical stability of electrolytes, [12][13][14][15][16] particularly those of the imide-type lithium salts. Notably, lithium bis(fluorosulfonyl)imide (LiFSI), an imide-type salt, has garnered attention in the lithium secondary battery industry due to its facile ionic conduction and improved chemical stability at moderately high temperature compared to typical LiPF 6 salt.…”

Modulation of lithium iron phosphate electrode architecture by magnetic ordering for lithium-ion batteries

“…5c). 27–29 The pristine LFP electrode exhibited significant deposition of C–O–, O–CO–, and CO-based components on its surface. By contrast, the magnetically aligned LFP electrodes exhibited reduced surface film formation after a cycle, owing to reduced polarization.…”

Vulnerable Solid Electrolyte Interphase Deposition in Sodium-Ion Batteries from Insufficient Overpotential Development during Formation

“…The thickness of the SEI film deposited on the hard carbon electrodes is investigated with time-of-flight secondary ion mass spectroscopy (ToF-SIMS) mapping before and after formation (Figure d). All images represent the ToF-SIMS fragment distribution maps of F – and CH 3 O – , which are the marker M–F and C–O bonds. ,, A thick and distinguishable SEI film is clearly observed in the LIB system on hard carbon electrode, compared to the SIB system. This behavior can be attributed to the relatively lower electrode potential and LUMO level of the electrolyte in LIBs, which leads to the formation of a vulnerable SEI on the surface of hard carbon from the decreased solvent reduction kinetics.…”