Strontium-free and cobalt-free perovskite type composite oxide and preparation method thereof, and battery

[0036] The embodiment of the present invention also provides a method for preparing the above-mentioned strontium-free and cobalt-free perovskite composite oxide. The embodiment of the present invention prepares the strontium-free and cobalt-free perovskite composite oxide by using the sol-gel method. things. Specifically, including:

[0037] According to different components La 1-x Ni 0.6 Fe 0.4 o 3 (0≤x<0.1, such as x=0, 0.02, 0.04, 0.06 and 0.08) each metal element metering ratio accurately weighs each metal salt, and then mixes and dissolves the above-mentioned metal salts in water to form a metal salt mixed solution, so that The molar ratio of La, Ni and Fe in the metal salt mixed solution is 1-x:0.6:0.4, 0≤x<0.1.

[0038] Wherein, the metal salt can be any one of nitrates, carbonates and acetates, and the metal salt mixed solution formed is also any one of the above-mentioned nitrates, carbonates and acetates.

[0039] Then EDTA and ammonia water are mixed and dissolv

[0050] The embodiment of the present invention provides a strontium-free and cobalt-free perovskite-type composite oxide whose chemical formula is LaNi 0.6 Fe 0.4 o 3 (Number: LNF).

[0051] The embodiment of the present invention also provides a method for preparing the above strontium-free and cobalt-free perovskite-type composite oxide, including:

[0052] Accurately weigh the nitrates containing La, Ni and Fe respectively, and the molar ratio of La, Ni and Fe is 1:0.6:0.4. Accurately weigh EDTA and glycine, and the sum of metal cations: EDTA: glycine = 1:1:1.5 (molar ratio).

[0053] Then dissolve the above three nitrates in a 1000ml large beaker with clear deionized water. After about 15 minutes, the metal nitrates can be completely dissolved. Place the beaker in a constant temperature oil bath and stir at a constant temperature of 80°C at a stirring speed of 400r / min. Metal salt mixed solution.

[0054] Then dissolve EDTA in a 100ml small beaker with ammonia water an

[0060] Embodiment 2 provides a strontium-free and cobalt-free perovskite composite oxide, whose chemical formula is La 0.98 Ni 0.6 Fe 0.4 o 3 (No.: LNF98).

[0061] Embodiment 3 provides a strontium-free and cobalt-free perovskite composite oxide, whose chemical formula is La 0.96 Ni 0.6 Fe 0.4 o 3 (No.: LNF96).

[0062] Embodiment 4 provides a strontium-free and cobalt-free perovskite composite oxide, whose chemical formula is La 0.94 Ni 0.6 Fe 0.4 o 3 (No.: LNF94).

[0063] Embodiment 5 provides a strontium-free and cobalt-free perovskite composite oxide, whose chemical formula is La 0.92 Ni 0.6 Fe 0.4 o 3 (No.: LNF92).