Non-aqueous electrolyte secondary battery and method for charging the same
First Claim
1. A method for charging a non-aqueous electrolyte secondary battery, comprising:
- (1) a first step of charging a non-aqueous electrolyte secondary battery at a constant current until the battery voltage reaches an upper limit voltage of 4.25 to 4.70 V, said non-aqueous electrolyte secondary battery comprising a negative electrode including a negative electrode active material, a positive electrode including a positive electrode active material consisting essentially of LiNi1-y-zMnyCozO2, wherein y and z satisfy 0<
y≦
0.5, 0≦
z≦
0.5 and 0<
y+z≦
0.75, and a non-aqueous electrolyte; and
(2) a second step of pulse charging said non-aqueous electrolyte secondary battery below said upper limit voltage, following said first step (1).
2 Assignments
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Accused Products
Abstract
A non-aqueous electrolyte secondary battery comprises a negative electrode including a negative electrode active material, a positive electrode including a positive electrode active material, and a non-aqueous electrolyte; the positive electrode active material is LiNi1-y-zMnyCozO2, wherein y and z satisfy 0<y≦0.5, 0≦z≦0.5, and 0<y+z≦0.75; and an upper limit voltage for charging the non-aqueous electrolyte secondary battery is 4.25 to 4.70 V.
It is possible to obtain a non-aqueous electrolyte secondary with high capacity, high reliability, and long life by properly setting the composition of a composite oxide of lithium which is a positive electrode active material and the charging conditions of the battery using this composite oxide of lithium as a positive electrode active material as described above.
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Citations
3 Claims
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1. A method for charging a non-aqueous electrolyte secondary battery, comprising:
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(1) a first step of charging a non-aqueous electrolyte secondary battery at a constant current until the battery voltage reaches an upper limit voltage of 4.25 to 4.70 V, said non-aqueous electrolyte secondary battery comprising a negative electrode including a negative electrode active material, a positive electrode including a positive electrode active material consisting essentially of LiNi1-y-zMnyCozO2, wherein y and z satisfy 0<
y≦
0.5, 0≦
z≦
0.5 and 0<
y+z≦
0.75, and a non-aqueous electrolyte; and(2) a second step of pulse charging said non-aqueous electrolyte secondary battery below said upper limit voltage, following said first step (1). - View Dependent Claims (2, 3)
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Specification