Gel Combustion Synthesis of Li(Ni,Mn,Co,Fe)O2 Solid Solutions
An option for the homogeneous substitution of iron for cobalt, nickel, and manganese in solid solutions with a α-NaFeO2-type layered structure formed in the system Li–Ni–Mn–Co–O was studied. Two sets of samples, namely, Li(Ni0.33Mn0.33Co0.33)1 –xFexO2 and Li(Ni0.60Mn0.20Co0.20)1 –xFexO2 (0 ≤ х ≤ 1), were prepared by combusting sucrose- or starch-based gels and characterized by X-ray powder diffraction. It is the first time that single-phase Li(Ni,Mn,Co,Fe)O2 samples containing 15–20% Fe of the total amount of cations were prepared. The position of a metastable area of Li(Ni,Mn,Co,Fe)O2 solid solutions with respect to the section LiNiO2–LiMn0.5Co0.5O2–LiFeO2 was determined in the frame of the isobaric–isothermal tetrahedron LiNiO2–LiMnO2–LiCoO2–LiFeO2.
Keywords:gel combustion diagram of a quasi-quaternary system
The study was performed in the frame of the Governmental assignment to the Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, in the field of fundamental research.
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