Nonaqueous secondary battery
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorShunpei Yamazaki
Life of this patent
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Abstract
To provide a novel structure of a separator in a secondary battery. A nonaquesous secondary battery includes a positive electrode, a negative electrode, an electrolyte solution, a first separator, and a second separator. The first separator and the second separator are provided between the positive electrode and the negative electrode. The first separator is provided with a first pore, the second separator is provided with a second pore, and the size of the first pore is different from the size of the second pore. Furthermore, the proportion of the volume of the first pores in the first separator is different from the proportion of the volume of the second pores in the second separator.
Claims26
A nonaqueous secondary battery comprising:
- a positive electrode;
- a negative electrode;
- and
- a stacked-layer structure between the positive electrode and the negative electrode, the stacked-layer structure including a first separator and a second separator,
- wherein the first separator is over the positive electrode,
- wherein the second separator is over and in contact with the first separator,
- wherein the first separator includes a first pore,
- wherein the second separator includes a second pore,
- wherein a size of the second pore is smaller than a size of the first pore, and
- wherein the first separator comprises a glass fiber.
A nonaqueous secondary battery comprising:
- a positive electrode;
- a negative electrode;
- and
- a stacked-layer structure between the positive electrode and the negative electrode, the stacked-layer structure including a first separator and a second separator,
- wherein the first separator is over the positive electrode,
- wherein the second separator is over and in contact with the first separator,
- wherein the first separator includes first pores,
- wherein the second separator includes second pores,
- wherein a proportion of a volume of the second pores in the second separator is lower than a proportion of a volume of the first pores in the first separator, and
- wherein the first separator comprises a glass fiber.
A nonaqueous secondary battery comprising:
- a positive electrode;
- a negative electrode;
- and
- a stacked-layer structure between the positive electrode and the negative electrode, the stacked-layer structure including a first separator, a second separator, and a third separator,
- wherein the first separator is over the positive electrode,
- wherein the second separator is over the first separator,
- wherein the third separator is over the second separator,
- wherein the second separator is in contact with the first separator and the third separator,
- wherein the first separator includes a first pore,
- wherein the second separator includes a second pore,
- wherein the third separator includes a third pore,
- wherein a size of the second pore is different from a size of the first pore and a size of the third pore, and
- wherein the second separator comprises a glass fiber.
A nonaqueous secondary battery comprising:
- a positive electrode;
- a negative electrode;
- and
- a stacked-layer structure between the positive electrode and the negative electrode, the stacked-layer structure including a first separator, a second separator, and a third separator,
- wherein the first separator is over the positive electrode,
- wherein the second separator is over the first separator,
- wherein the third separator is over the second separator,
- wherein the second separator is in contact with the first separator and the third separator,
- wherein the first separator includes a first pore,
- wherein the second separator includes a second pore,
- wherein the third separator includes a third pore,
- wherein a size of the second pore is larger than a size of the first pore and a size of the third pore, and
- wherein the second separator comprises a glass fiber.
Dependencies are inferred from the claim text.