Positive electrode active substance for lithium secondary battery, method for producing the same and lithium secondary battery
a lithium secondary battery and active substance technology, applied in the field of positive electrode active substances for lithium secondary batteries, can solve problems such as deterioration of cycle characteristics and lithium secondary batteries using lithium cobaltate, and achieve excellent cycle characteristics, high energy density retention rate, and high maintenance voltage
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[0098]Hereinafter, the present invention will be described in more detail by way of Examples, but the present invention is not any more limited to these Examples.
[0099]
[0100]Lithium carbonate (average particle diameter: 5.7 μm), tricobalt tetraoxide (average particle diameter: 2.5 μm), titanium dioxide (average particle diameter: 0.4 μm) and calcium sulfate (average particle diameter: 7.3 μm) were weighed and fully mixed by a household mixer to thereby obtain a raw material mixture in which the molar ratio of Li / Co was 1.04; Ti / Co, 0.01; and Ca / Co, 0.0006.
[0101]Then, the obtained raw material mixture was fired at 1,050° C. for 5 hours in the air in an alumina bowl. After the finish of the firing, the fired product was crushed and classified to thereby obtain a lithium cobalt composite oxide particle containing 1.0% by mol of Ti and 0.06% by mol of Ca with respect to Co.
[0102]Lithium carbonate (average particle diameter: 5.7 μm), tricobalt tetraoxide (average particle diameter: 3.3 μ...
examples 1 to 9
[0108]In each Example, the LCO particle 1a or 1b described in Table 1 was used, and the LCO particle 1a or 1b and the above MgF2 and AlF3 were weighed so that the amounts of the inorganic fluoride particles added became amounts indicated in a first step of Table 3, and fully mixed by a household mixer.
[0109]Then, the mixture was subjected to a heat treatment (at 600° C. for 5 hours) in the air indicated in a second step of Table 3 to thereby prepare a positive electrode active substance sample.
example 10
[0110]The LCO particle 1b described in Table 1 was used, and the LCO particle 1b and the above MgF2 and AlF3 were weighed so that the amounts of the inorganic fluoride particles added became amounts indicated in the first step of Table 3; and water was further added to thereby prepare a 40 mass % slurry; and the slurry was fully stirred and mixed toy a stirrer.
[0111]Then, the slurry was subjected to a spray drying treatment by a spray drying machine whose exhaust temperature was regulated to 120° C. to thereby obtain a dried powder.
[0112]Then, the dried powder was subjected to a heat treatment (at 600° C. for 5 hours) in the air indicated in the second step of Table 3 to thereby prepare a positive electrode active substance sample.
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