Electrochemical absorption effect of BF4 anion salt on SEI layer formation

Superhalogens as Building Blocks of Halogen‐Free Electrolytes in Lithium‐Ion Batteries

“…The current electrolytes consist of lithium salts such as LiAsF 6 , LiBF 4 , LiPF 6 , LiFePO 4 , LiClO 4 , LiN-(SO 2 F) 2 , and LiN(SO 2 CF 3 ) 2 , combined with organic solvents like ethylene carbonate and dimethyl carbonate. [16][17][18][19] Although these electrolytes are commercially available and popularly used in Li-ion batteries, they have certain disadvantages. With the exception of LiFePO 4, the above electro-lytes contain halogens, which are toxic.…”

Electrochemical performance of nonflammable polymeric gel electrolyte containing triethylphosphate

“…Discharge capacity of 126 mAh g −1 has been obtained for the first discharge, which is lower than the ideal value of 348 mAh g −1 for this material. The low value of discharge capacity may be due to absorption of BF 4 anion [23] on the graphite electrode, or due to the formation of a passivation layer on the graphite, which would be associated with decomposition of the electrolytic salt on the graphite electrode. Despite of the low capacity, nonflammable gel electrolyte with TEP shows better compatibility with the graphite electrode without any film forming additives, and also good self-standing gel with improved mechanical properties.…”

Electrolyte optimization for a Li ion battery by charge profile analysis

“…In the authors' previous paper on the mixed-salt effect due to the formation of the SEI layer, the reduction peak on the graphite electrode formed during the first charging period was confirmed as a valid peak, and it significantly affected the battery performance (i.e. charge/discharge capacities, life cycle, safety, and storage properties of the battery at high temperature) [18]. The faradaic currents increased dramatically from ?0.5 and -2.5 V in the oxidation and reduction processes, respectively; these currents are probably attributable to the Li ?…”

“…4, the reduction current at -3.0 V decreased in the descending order of LiPF 6 , LiTFSI, and LiBF 4 in the electrolyte systems. Since the ionic bonding force of LiBF 4 is stronger than that of LiPF 6 or LiTFSI [18], the number of dissociated Li ? ions from LiBF 4 decreases in the EMC or the DEC system.…”