Nonaqueous electrolyte battery, battery pack and vehicle
AssigneeKabushiki Kaisha Toshiba
InventorsHiroki Inagaki, Nori Takami
Life of this patent
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Abstract
A nonaqueous electrolyte battery includes a positive electrode containing a lithium-transition metal oxide having a layered crystal structure; a negative electrode containing a lithium-titanium composite oxide having a spinel structure; and a nonaqueous electrolyte. The positive electrode and the negative electrode satisfy the formula (1) given below: 1.25≦X (1), where X is a ratio of an available electric capacity, represented by “(B/A)”, A is an available electric capacity (mAh) at 25° C. per cm2 of the positive electrode, and B is an available electric capacity (mAh) at 25° C. per cm2 of the negative electrode.
Claims20
A nonaqueous electrolyte battery comprising:
- a positive electrode containing a positive electrode current collector, and a positive electrode layer which is formed on both surfaces of the positive electrode current collector and contains a lithium-transition metal oxide having a layered crystal structure;
- a negative electrode containing a negative electrode current collector, and a negative electrode layer which is formed on both surfaces of the negative electrode current collector and contains a lithium-titanium composite oxide having a spinel structure;
- and
- a nonaqueous electrolyte,
- wherein the positive electrode and the negative electrode satisfy the formula given below:
- 1.33≦X≦2.00,
- where X is a ratio of an available electric capacity, represented by “(B/A)”, A is an available electric capacity (mAh) at 25° C. per cm2 of the positive electrode, and B is an available electric capacity (mAh) at 25° C. per cm2 of the negative electrode,
- the available electric capacity of each of the positive electrodes is an electric capacity obtained by charging under a constant current of 0.2 C to reach 4.25 V, followed by discharging under a constant current of 0.2 C to reach 3.5 V, and
- the available electric capacity of each of the negative electrodes is an electric capacity obtained by charging under a constant current of 0.2 C to reach 1.0 V, followed by discharging under a constant current of 0.2 C to reach 2.0 V.
A battery pack comprising nonaqueous electrolyte batteries, each comprising:
- a positive electrode containing a positive electrode current collector, and a positive electrode layer which is formed on both surfaces of the positive electrode current collector and contains a lithium-transition metal oxide having a layered crystal structure;
- a negative electrode containing a negative electrode current collector, and a negative electrode layer which is formed on both surfaces of the negative electrode current collector and contains a lithium-titanium composite oxide having a spinel structure;
- and
- a nonaqueous electrolyte,
- wherein in each of the nonaqueous electrolyte batteries the positive electrode and the negative electrode satisfy the formula given below:
- 1.33≦X≦2.00,
- where X is a ratio of an available electric capacity, represented by “(B/A)”, A is an available electric capacity (mAh) at 25° C. per cm2 of the positive electrode, and B is an available electric capacity (mAh) at 25° C. per cm2 of the negative electrode,
- the available electric capacity of each of the positive electrodes is an electric capacity obtained by charging under a constant current of 0.2 C to reach 4.25 V, followed by discharging under a constant current of 0.2 C to reach 3.5 V, and
- the available electric capacity of each of the negative electrodes is an electric capacity obtained by charging under a constant current of 0.2 C to reach 1.0 V, followed by discharging under a constant current of 0.2 C to reach 2.0 V.
Dependencies are inferred from the claim text.