Piperidinium-based ionic liquid electrolyte with linear solvent and LiODFB for LiFePO₄/Li cells at room and high temperature

Abstract

Lithium difluoro(oxalato)borate (LiODFB) combines the advantages of the salts LiBOB and LiBF4 when used in electrolytes for lithium ion cells.

Mixed Lithium Salts Electrolyte Improves the High-Temperature Performance of Nickel-Rich Based Lithium-Ion Batteries

“…8d, the B 1 s presents two prominent peaks, locating at about 191.00 eV and 192.42 eV, which is attributed to the B-O of LiDFOB. 36 This further confirms that the LiDFOB can decompose and produce an artificial CEI layer, which can effectively inhibit the decomposition of LiPF 6 and improve the stability of the NCM811 cathode. In this paper, all these data suggest that the addition of LiDFOB could form a protective film during the cycling of NCM811 cathode at 60 °C, which endows a good electrochemical performance of the cells at high temperature.…”

Enhanced Electrochemical Performance of LiNi0.8Co0.1Mn0.1O2 Cathode with an Ionic Liquid-Based Electrolyte

“…The C 1s spectra of the pristine contain three peaks, and these peaks correspond to C-C (284.8eV), C-H (285.7eV) and C-F (291.1eV) in PVDF. [32][33][34] The F 1s spectra only have a single peak at 687.8eV (C-F) which is assigned to PVDF. 35 New peaks appeared on the surface of the cathode with different electrolyte after 100 cycles including C-O (286.4eV), C=O (288.9eV) and Li-F (685.2eV).…”

“…The peaks of NCM811 with E0 at 167.8 eV and 168.7 eV are corresponded to Li 2 SO 3 and ROSO 2 Li which are derived from SL. 33,39,40 It represents that IL and SL participate in the modification of CEI layers.…”

Novel piperidinium-based ionic liquid as electrolyte additive for high voltage lithium-ion batteries

“…[21][22][23] ILs have been used as promising electrolyte additives in the high voltage LIBs due to the advantages of thermal stability, non-ammability and large electrochemical window. [24][25][26][27][28] Piperidinium-based ILs are gradually used as electrolyte additives in LIBs due to high conductivity and wide electrochemical window. Dong, et al have revealed that a piperidium-based IL is used in high voltage and temperature conditions, the addition of IL results in the formation of a protective cathode lm inhibiting severe decomposition of electrolytes.…”