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AssigneeGS Yuasa International Ltd.
InventorsDaisuke ENDO, Hiromasa MURAMATSU
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A positive active material for a lithium secondary battery containing a lithium transition metal composite oxide having a hexagonal crystal structure in which the transition metal (Me) includes Ni, Co and Mn, wherein in the lithium transition metal composite oxide, a molar ratio of Ni to the transition metal (Me) (Ni/Me) is 0.5 or more and 0.9 or less, a molar ratio of Co to the transition metal (Me) (Co/Me) is 0.1 or more and 0.3 or less, a molar ratio of Mn to the transition metal (Me) (Mn/Me) is 0.03 or more and 0.3 or less, and a value obtained by dividing a half width ratio F(003)/F(104) at a potential of 4.3 V (vs. Li/Li+) by a half width ratio F(003)/F(104) at a potential of 2.0 V (vs. Li/Li+) is 0.9 or more and 1.1 or less.
A positive active material for a lithium secondary battery containing a lithium transition metal composite oxide having a hexagonal crystal structure in which the transition metal (Me) includes Ni, Co and Mn, wherein in the lithium transition metal composite oxide, a molar ratio of Ni to the transition metal (Me) (Ni/Me) is 0.5 or more and 0.9 or less, a molar ratio of Co to the transition metal (Me) (Co/Me) is 0.1 or more and 0.3 or less, a molar ratio of Mn to the transition metal (Me) (Mn/Me) is 0.03 or more and 0.3 or less, and a value obtained by dividing a half width ratio F(003)/F(104) at a potential of 4.3 V (vs. Li/Li+) by a half width ratio F(003)/F(104) at a potential of 2.0 V (vs. Li/Li+) is 0.9 or more and 1.1 or less.
A method for producing a positive active material for a lithium secondary battery containing a lithium transition metal composite oxide having a hexagonal crystal structure in which the transition metal (Me) includes Ni, Co and Mn, wherein when coprecipitating compounds containing Ni, Co and Mn in a solution to prepare a precursor, a solution containing a compound of Ni and Co and a solution containing a Mn compound are simultaneously added dropwise separately, and thereby a precursor of a transition metal composite oxide in which a molar ratio of Ni to the transition metal (Me) is 0.5 or more and 0.9 or less, a molar ratio of Co to the transition metal (Me) is 0.1 or more and 0.3 or less, and a molar ratio of Mn to the transition metal (Me) is 0.03 or more and 0.3 or less, is prepared.
Dependencies are inferred from the claim text.