Positive-electrode active material for nonaqueous-electrolyte secondary cell, and nonaqueous-electrolyte secondary cell
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsToshinobu Kanai, Takeshi Ogasawara
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Abstract
A positive-electrode active material includes a lithium transition metal composite oxide that contains at least 80 mol % of Ni in relation to the total molar amount of metal elements excluding Li. The lithium transition metal composite oxide includes secondary particles obtained by the aggregation of primary particles, at least one element A selected from Ca and Sr being present on the surface of the primary particles in an amount of 1 mol % or less in relation to the total molar amount of metal elements excluding Li, and S and at least one element B selected from Zr, Ti, Mn, Er, Pr, In, Sn, and Ba being present on the surface of the secondary particles.
Claims12
A positive electrode active material for a non-aqueous electrolyte secondary battery, including a lithium-transition metal composite oxide containing 80 mol % or more of Ni based on a total amount of moles of metal elements excluding Li, wherein
- the lithium-transition metal composite oxide includes secondary particles formed by aggregation of primary particles,
- at least one element A selected from the group consisting of Ca and Sr is present on surfaces of the primary particles in an amount of 3 mol % or less based on the total amount of moles of the metal elements excluding Li,
- at least one element B selected from the group consisting of Zr, Ti, Mn, Er, Pr, In, Sn, and Ba;
- and S are present on surfaces of the secondary particles, and
- a first coating layer including the element A and a second coating layer formed to cover the first coating layer and including the element B and S are formed on surfaces of the secondary particles.
A positive electrode active material for a non-aqueous electrolyte secondary battery, including a lithium-transition metal composite oxide containing 80 mol % or more of Ni based on a total amount of moles of metal elements excluding Li, wherein
- the lithium-transition metal composite oxide includes secondary particles formed by aggregation of primary particles,
- at least one element A selected from the group consisting of Ca and Sr is present on surfaces of the primary particles in an amount of 3 mol % or less based on the total amount of moles of the metal elements excluding Li,
- at least one element B selected from the group consisting of Ti, Mn, Er, Pr, In, Sn, and Ba;
- and S are present on surfaces of the secondary particles, and
- the element B is only present on surfaces of the secondary particles but is absent inside the secondary particles.
Dependencies are inferred from the claim text.