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Sulfolan with LiPF6, LiNTf2 and LiBOB - as a Non-Flammable Electrolyte Working in a Cell with a LiNiO2 Cathode

Beata Kurc

LiNiO2 was examined as cathode materials for the lithium-ion battery, working with non-flammable electrolyte, obtained by dissolution of solid lithium bis(trifluoromethanesulphonyl)imide (LiNTf2), lithium bis(oxalato)borate (LiBOB) and lithium hexa fluorophosphate (LiPF6, Fluka) in sulfolane (TMS) with 10% vinylene carbonate (VC). The Li/LiNiO2 cells were tested by cyclic voltammetry, galvanostatic charging/discharging. The LiNiO2 cathode showed good cyclability and coulombic efficiency for the electrolyte, which contains 1 M LiPF6 in TMS+10%VC (195 and 140 mAhg-1 after 20 cycles-C/10). Correspondingly lower capacity was observed for system Li/LiNiO2 in: 1 M LiNTf2 in TMS+10%VC and 1 M LiBOB in TMS+10%VC. The LiNiO2 (solid)+1 M LiPF6+TMS+10%VC system show a flash point of ca. 160°C (classical LiNiO2+1 M LiPF6+EC 50%+DMC 50% system: Tf ≈ 42°C).