High Performance Lithium-Ion Batteries Using Fluorinated Compounds

Enhancement of dielectric and electric-field-induced polarization of bismuth fluoride nanoparticles within the layered structure of carbon nitride

“…The fluorine atom has the highest electronegativity and small polarizability, which allows for the making strong and stable chemical bonds with other elements. Because of these properties, inorganic and organic fluorine compounds and fluoropolymers are employed for lithium batteries, fuel cells and capacitor applications 5 . Conversion-type fluorides have potential to achieve high energy density by involving the light and small fluoride anion 6 .…”

Lithium-ion battery recycling: a source of per- and polyfluoroalkyl substances (PFAS) to the environment?

“…2C). 11,43,71 There are also examples of peruorinated analogues of the PF 6 − and BF 4 − anions, of which lithium tri(pentauoroethyl)triphosphate (LiFAP) has shown promising results for increasing the ash point of the electrolyte solvent (Fig. 2C), 11,52,76 among other properties.…”

“…2D). 11,43,52,71,74,[76][77][78][79][80][81] In addition to reducing ammability, uorine substitution in solvents increases oxidation potential and, consequently, anodic stability under high temperature and voltage. 76,77 However, the electrolyte solvent should also be capable of solvating lithium ions, which becomes increasingly difficult with uorination.…”

“…both salt and solvent) fulll many of these requirements, suggesting that these substances may be strong candidates for future battery components. 11,71,78 However, challenges remain for uorinated binder materials such as PVDF, which may not meet adhesion and mechanical strength requirements under high voltages. Multilayer binders of the aforementioned polymers or other materials have been proposed, 44 which may complicate the recycling procedure.…”

Electrolyte designs for safer lithium-ion and lithium-metal batteries

“…62,70,110 The rst stable redox shuttle additive used in 4 V LIBs was 2-(pentauorophenyl)-tetrauoro-1,3,2-benzodioxaborole (PFPTFBB); it has an onset oxidation potential of 4.43 V vs. Li + /Li and has seen major successes in preventing the overcharging of LIBs. 70,107,108,111,112 In the most successful one, the additives sustained over 160 cycles with 100% overcharge per cycle, at charging rates of C/10 and C/ 5 at 55 °C in a LiNi 0.8 Co 0.15 Al 0.05 O 2 /graphite full cell. 108 Studies of PFPTFBB have also hinted at its dual functionality where its boron center acts as an anion receptor, improving the capacity retention of LIBs.…”