Positive electrode active material, positive electrode, lithium-ion secondary battery, and method of producing positive electrode active material
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKunimitsu YAMAMOTO, Yoshinari MAKIMURA
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Abstract
A positive electrode active material contains at least: fluorine in an amount not lower than 0.08 mass %; carbon in an amount not lower than 0.02 mass %; and lithium-metal composite oxide particles making up the remainder. The lithium-metal composite oxide particles contain nickel in an amount not lower than 60 mol % of the total amount of metallic elements. At least a partial amount of each of the fluorine and the carbon is present on surfaces of the lithium-metal composite oxide particles.
Claims10
A positive electrode active material for a lithium-ion secondary battery, the positive electrode active material comprising at least:
- fluorine in an amount not lower than 0.08 mass %;
- carbon in an amount not lower than 0.02 mass %;
- and
- lithium-metal composite oxide particles making up the remainder,
- the lithium-metal composite oxide particles containing nickel in an amount not lower than 60 mol % of the total amount of metallic elements,
- at least a partial amount of each of the fluorine and the carbon being present on surfaces of the lithium-metal composite oxide particles.
A method of producing a positive electrode active material for a lithium-ion secondary battery, the method comprising at least:
- preparing lithium-metal composite oxide particles;
- mixing the lithium-metal composite oxide particles with a fluorocarbon material to prepare a mixture;
- and
- heating the mixture in an inert atmosphere to produce the positive electrode active material,
- the lithium-metal composite oxide particles containing nickel in an amount not lower than 60 mol % of the total amount of metallic elements,
- a content of the fluorocarbon material in the mixture being determined so that the positive electrode active material contains at least fluorine in an amount not lower than 0.08 mass %, carbon in an amount not lower than 0.02 mass %, and the lithium-metal composite oxide particles making up the remainder.
Dependencies are inferred from the claim text.