FIELD: chemistry.
SUBSTANCE: invention can be used in chemical industry. Lithium-iron phosphate having an olivine crystal structure has a composition expressed by the chemical formula (I) L1+aFe1-xMx(PO4-b)Xb (where M is selected from Al, Mg, Ti; X is selected from F, S, N; -0.5≤a≤+0.5; 0≤x≤0.5; and 0≤b≤0.1 ), contains 0.1-5 wt % Li3PO4 and does not contain or contains less than 0.25 wt % Li2CO3. Content of Li3PO4 in the lithium-iron phosphate increases electrochemical stability and ensures thermal safety and ion conductivity.
EFFECT: lithium-iron phosphate according to the present invention can be used as an active material for a positive electrode of a secondary lithium battery.
15 cl, 1 tbl, 5 dwg
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