Latest contribution to the journal


Latest contribution to the journal

Latest article published in journal of Insights and analytical electrochemistry was a research article entitled “Sulfolan with LiPF6 , LiNTf2 and LiBOB - as a Non-Flammable Electrolyte Working in a Cell with a LiNiO2 Cathode” by author 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).

Lithium ion batteries (LIBs) have become the most prominent choice of power source for all types of portable microelectronic devices, as they offer higher energy density than the other rechargeable power sources . Development of a highly efficient, thin film positive electrode which can provide high cell voltage, high specific capacity and cycling stability even at rapid charge/discharge rates, is the key issue of electrochemical research . Good Enough et al. was the first to report a layered lithium cobalt oxide (LiCoO2 ) positive electrode material in the 1980’s. In the practice major limitation is connected with the removal of Li from LixCoO2 i.e., de lithiation of LiCoO2 restricted to x Ľ 0.5, which corresponds to 4.2 V vs. Li/Li (a capacity value of 140 mAhg-1). However, several efforts have been expended to extract extra capacity and to cycle the LiCoO2 cathode beyond 4.2 V so as to increase energy density of the LIB’s . This would be connected with obtain: desirable properties of LiCoO2 as a cathode without post deposition heat treatments at elevated temperatures , replacing a part of base transition metal (Co) with another element (Ni, Mn, Ti, Fe etc.) , surface modification of LiCoO2 films with inert metal oxides (MOx, M Ľ Al, Mg, Sn, Zn, Zr) and inorganic salts (AlF3 , Al(OH)3 , AlPO4 )  and development of various nano-structured LiCoO2 materials .] and tailoring the morphological properties .

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