Method of charging lithium ion secondary battery including a constant current, charging apparatus, and power supply apparatus

A method of charging a lithium ion secondary battery, the lithium ion secondary battery comprising 1) a positive electrode that includes a mixed metal oxide containing at least Li, Mn, and Ni as metal components as a positive electrode active material, 2) a negative electrode, and 3) a nonaqueous electrolytic solution containing a lithium salt, the method comprising:

• constant current charging the lithium ion secondary battery with a set charging current value I1 corresponding to a set value nC satisfying a condition represented by an expression (1):
• 2C≦nC≦60C (1)
• where C is a rated capacity value of the lithium ion secondary battery, and n is a number from 2 to 60;
• monitoring a battery voltage, and
• stopping the constant current charging when the battery voltage reaches a set voltage value ΔE1 within a range of +4.3 V to +5.0 V, wherein
• the negative electrode contains a conductive carbon material as a negative electrode active material;
• wherein
• the mixed metal oxide simultaneously satisfies conditions of expressions (I) to (IV):
• LixMnyNizCo(1-y-z)O2 (I)
• 0.85≦X≦1.1 (II)
• 0.1≦Y≦0.5 (III)
• 0.55≦Z≦0.8 (IV)
• where X, Y, and Z in expression (I) indicate values simultaneously satisfying the conditions of expressions (II) to (IV).

A method of charging a lithium ion secondary battery, the lithium ion secondary battery comprising 1) a positive electrode that includes a mixed metal oxide containing at least Li, Mn, and Ni as metal components as a positive electrode active material, 2) a negative electrode, and 3) a nonaqueous electrolytic solution containing a lithium salt, the method comprising:

• constant current charging the lithium ion secondary battery with a set charging current value I1 corresponding to a set value nC satisfying a condition represented by an expression (1):
• 2C≦nC≦60C (1)
• where C is a rated capacity value of the lithium ion secondary battery, and n is a number from 2 to 60;
• monitoring a battery voltage, and
• stopping the constant current charging when the battery voltage reaches a set voltage value ΔE1 within a range of +2.8 V to +3.5 V, wherein
• the negative electrode contains lithium titanate as a negative electrode active material;
• wherein
• the mixed metal oxide simultaneously satisfies conditions of expressions (I) to (IV):
• LixMnyNizCo(1-y-z)O2 (I)
• 0.85≦X≦1.1 (II)
• 0.1≦Y≦0.5 (III)
• 0.55≦Z≦0.8 (IV)
• where X, Y, and Z in expression (I) indicate values simultaneously satisfying the conditions of expressions (II) to (IV).