Lithium cobalt oxide, method for manufacturing the same, and nonaqueous electrolyte secondary battery
AssigneeNippon Chemical Industrial Co., Ltd.
InventorsHidekazu Awano, Yoshihide Ooishi, Nobuyuki Yamazaki
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Abstract
Lithium cobalt oxide, which can provide a nonaqueous electrolyte secondary battery having an excellent initial capacity and an excellent capacity retention, and a method for manufacturing the same are provided. The lithium cobalt oxide has a tap density of at least 1.7 g/cm3 and a pressed density of 3.5 to 4.0 g/cm3. A method for manufacturing the lithium cobalt oxide includes the step of selecting a lithium cobalt oxide (A) and a lithium cobalt oxide (B) so that a difference in the tap density between the lithium cobalt oxide (A) and the lithium cobalt oxide (B) is at least 0.2 g/cm3; and mixing the lithium cobalt oxide (A) and the lithium cobalt oxide (B).
Claims9
A method for manufacturing a lithium cobalt oxide, said method comprising the steps of:
- providing a lithium cobalt oxide (A) composed of uniformly monodisperse particles, which refers to particles present independently of each other, having an average particle diameter in a range of 5 to 30 μm and a tap density of 1.7 to 3.0 g/cm3;
- providing a lithium cobalt oxide (B) composed of an aggregation of primary particles forming a secondary particle, having an average particle diameter in a range of 0.1 to 10 μm and a tap density of 1.0 to 2.0 g/cm3;
- selecting a lithium cobalt oxide (A) and a lithium cobalt oxide (B) so that a difference in the tap density between the lithium cobalt oxide (A) and the lithium cobalt oxide (B) is at least 0.2 g/cm3;
- and
- mixing the lithium cobalt oxide (A) and the lithium cobalt oxide (B) selected in said step of selecting.
A method for manufacturing a lithium cobalt oxide, said method comprising the steps of:
- providing a lithium cobalt oxide (A) composed of uniformly monodisperse particles, which refers to particles present independently of each other, having an average particle diameter in a range of 5 to 30 μm and a tap density of 1.7 to 3.0 g/cm3;
- providing a lithium cobalt oxide (B) composed of an aggregation of primary particles forming a secondary particle, having an average particle diameter in a range of 0.1 to 10 μm and a tap density of 1.0 to 2.0 g/cm3;
- selecting a lithium cobalt oxide (A) and a lithium cobalt oxide (B) so that a difference in the tap density between the lithium cobalt oxide (A) and the lithium cobalt oxide (B) is at least 0.2 g/cm3;
- and
- mixing the lithium cobalt oxide (A) and the lithium cobalt oxide (B) selected in said step of selecting;
- wherein said step of mixing the lithium cobalt oxide (A) and the lithium cobalt oxide (B) includes using an average particle diameter of the lithium cobalt oxide particles (B) smaller than an average particle diameter of the lithium cobalt oxide particles (A).
A method for manufacturing a lithium cobalt oxide used for a cathode active material of a cathode plate in a nonaqueous electrolyte secondary battery, said method comprising the steps of:
- providing a lithium cobalt oxide (A) composed of uniformly monodisperse particles, which refers to particles present independently of each other, having an average particle diameter in a range of 5 to 30 μm and a tap density of 1.7 to 3.0 g/cm3;
- providing a lithium cobalt oxide (B) composed of an aggregation of primary particles forming a secondary particle, having an average particle diameter in a range of 0.1 to 10 μm and a tap density of 1.0 to 2.0 g/cm3;
- selecting a lithium cobalt oxide (A) and a lithium cobalt oxide (B) so that a difference in the tap density between the lithium cobalt oxide (A) and the lithium cobalt oxide (B) is at least 0.2 g/cm3;
- and
- mixing the lithium cobalt oxide (A) and the lithium cobalt oxide (B) selected in said step of selecting;
- wherein said step of mixing the lithium cobalt oxide (A) and the lithium cobalt oxide (B) includes using an average particle diameter of the lithium cobalt oxide particles (B) smaller than an average particle diameter of the lithium cobalt oxide particles (A).
Dependencies are inferred from the claim text.