Battery separator, method of manufacturing a battery separator, battery, battery pack, and electronic apparatus
View Patent ↗A battery separator includes a porous base material and a heat-resistant layer. The porous base material includes a first surface, a second surface opposed to the first surface, and a hole. The hole is formed in the porous base material and causes the first surface and the second surface to communicate with each other. The heat-resistant layer is configured to cover at least the first surface and a surface of the hole. The heat-resistant layer is formed of an inorganic material and deposited by an atomic layer deposition method.
1. A battery separator, comprising:
a porous base material including
a first surface,
a second surface opposed to the first surface, and
a hole that is formed in the porous base material and causes the first surface and the second surface to communicate with each other; and
a heat-resistant layer configured to cover at least the first surface and a surface of the hole, the heat-resistant layer being formed of an inorganic material and deposited by an atomic layer deposition method,
wherein the heat-resistant layer that covers the first surface has a thickness larger than that of the heat-resistant layer that covers the surface of the hole.
2. The battery separator according to claim 1 , wherein
the heat-resistant layer has a thickness of 2 nm or more and 10 nm or less.
3. The battery separator according to claim 1 , wherein
the heat-resistant layer covers the first surface, the second surface, and the surface of the hole.
4. The battery separator according to claim 1 , wherein
the inorganic material is any one of an aluminum oxide, a silicon oxide, and a titanium oxide.
5. The battery separator according to claim 1 , wherein
the base material is a polyolefin-based resin.
6. The battery separator according to claim 1 , wherein
the base material has a thickness of 5 μm or more and 20 μm or less.
7. The battery separator according to claim 1 , wherein
the hole has an inner diameter of 50 nm or more and 100 nm or less.
8. A method of manufacturing a battery separator, comprising:
preparing a porous base material including
a first surface,
a second surface opposed to the first surface, and
a hole that is formed in the porous base material and causes the first surface and the second surface to communicate with each other; and
forming a heat-resistant layer by an atomic layer deposition method, the heat-resistant layer being configured to cover at least the first surface and a surface of the hole and being formed of an inorganic material,
wherein the heat-resistant layer that covers the first surface has a thickness larger than that of the heat-resistant layer that covers the surface of the hole.
9. The method of manufacturing a battery separator according to claim 8 , wherein
the heat-resistant layer is alternately formed on the first surface and the second surface.
10. A battery, comprising:
a positive electrode;
a negative electrode;
an electrolyte layer arranged between the positive electrode and the negative electrode; and
a separator including
a porous base material including a first surface opposed to the positive electrode, a second surface opposed to the negative electrode, and a hole that is formed in the porous base material and causes the first surface and the second surface to communicate with each other, and
a heat-resistant layer to cover at least the first surface and a surface of the hole, the heat-resistant layer being formed of an inorganic material and deposited by an atomic layer deposition method,
wherein the heat-resistant layer that covers the first surface has a thickness larger than that of the heat-resistant layer that covers the surface of the hole.
11. A battery pack, comprising:
a battery including
a positive electrode,
a negative electrode,
an electrolyte layer arranged between the positive electrode and the negative electrode, and
a separator including
a porous base material including a first surface opposed to the positive electrode, a second surface opposed to the negative electrode, and a hole that is formed in the porous base material and causes the first surface and the second surface to communicate with each other, and
a heat-resistant layer to cover at least the first surface and a surface of the hole, the heat-resistant layer being formed of an inorganic material and deposited by an atomic layer deposition method;
a control unit configured to control charge and discharge of the battery; and
a package body configured to support the battery and the control unit,
wherein the heat-resistant layer that covers the first surface has a thickness larger than that of the heat-resistant layer that covers the surface of the hole.
12. An electronic apparatus, comprising:
a battery including
a positive electrode,
a negative electrode,
an electrolyte layer arranged between the positive electrode and the negative electrode, and
a separator including
a porous base material including a first surface opposed to the positive electrode, a second surface opposed to the negative electrode, and a hole that is formed in the porous base material and causes the first surface and the second surface to communicate with each other, and
a heat-resistant layer to cover at least the first surface and a surface of the hole, the heat-resistant layer being formed of an inorganic material and deposited by an atomic layer deposition method; and
a power receiving circuit configured to receive power supply from the battery,
wherein the heat-resistant layer that covers the first surface has a thickness larger than that of the heat-resistant layer that covers the surface of the hole.
13. A battery separator, comprising:
a porous base material including
a first surface,
a second surface opposed to the first surface, and
a hole that is formed in the porous base material and causes the first surface and the second surface to communicate with each other; and
a heat-resistant layer configured to cover at least the first surface and a surface of the hole, the heat-resistant layer being formed of an inorganic material and deposited by an atomic layer deposition method,
wherein a thickness of the heat-resistant layer that covers the surface of the hole is reduced as a distance from the first surface and the second surface is increased.
14. The battery separator according to claim 13 , wherein
the heat-resistant layer has a thickness of 2 nm or more and 10 nm or less.
15. The battery separator according to claim 13 , wherein
the heat-resistant layer covers the first surface, the second surface, and the surface of the hole.
16. The battery separator according to claim 13 , wherein
the inorganic material is any one of an aluminum oxide, a silicon oxide, and a titanium oxide.
17. The battery separator according to claim 13 , wherein
the base material is a polyolefin-based resin.
18. The battery separator according to claim 13 , wherein
the base material has a thickness of 5 μm or more and 20 μm or less.
19. The battery separator according to claim 13 , wherein the hole has an inner diameter of 50 nm or more and 100 nm or less.
20. A battery separator, comprising:
a porous base material including
a first surface,
a second surface opposed to the first surface, and
a hole that is formed in the porous base material and causes the first surface and the second surface to communicate with each other; and
a heat-resistant layer configured to cover at least the first surface and a surface of the hole, the heat-resistant layer being formed of an inorganic material and deposited by an atomic layer deposition method,
wherein in the heat-resistant layer that covers the surface of the hole, the thickness of the heat-resistant layer provided at the center in a thickness direction of the battery separator is thinner than that of other portions of the heat-resistant layer.
21. The battery separator according to claim 20 , wherein
the heat-resistant layer has a thickness of 2 nm or more and 10 nm or less.
22. The battery separator according to claim 20 , wherein
the heat-resistant layer covers the first surface, the second surface, and the surface of the hole.
23. The battery separator according to claim 20 , wherein
the inorganic material is any one of an aluminum oxide, a silicon oxide, and a titanium oxide.
24. The battery separator according to claim 20 , wherein
the base material is a polyolefin-based resin.
25. The battery separator according to claim 20 , wherein
the base material has a thickness of 5 μm or more and 20 μm or less.
26. The battery separator according to claim 20 , wherein
the hole has an inner diameter of 50 nm or more and 100 nm or less.
27. A method of manufacturing a battery separator, comprising:
preparing a porous base material including
a first surface,
a second surface opposed to the first surface, and
a hole that is formed in the porous base material and causes the first surface and the second surface to communicate with each other; and
forming a heat-resistant layer by an atomic layer deposition method, the heat-resistant layer being configured to cover at least the first surface and a surface of the hole and being formed of an inorganic material,
wherein a thickness of the heat-resistant layer that covers the surface of the hole is reduced as a distance from the first surface and the second surface is increased.
28. A method of manufacturing a battery separator, comprising:
preparing a porous base material including
a first surface,
a second surface opposed to the first surface, and
a hole that is formed in the porous base material and causes the first surface and the second surface to communicate with each other; and
forming a heat-resistant layer by an atomic layer deposition method, the heat-resistant layer being configured to cover at least the first surface and a surface of the hole and being formed of an inorganic material,
wherein in the heat-resistant layer that covers the surface of the hole, the thickness of the heat-resistant layer provided at the center in a thickness direction of the battery separator is thinner than that of other portions of the heat-resistant layer.
29. A battery, comprising:
a positive electrode;
a negative electrode;
an electrolyte layer arranged between the positive electrode and the negative electrode; and
a separator including
a porous base material including a first surface opposed to the positive electrode, a second surface opposed to the negative electrode, and a hole that is formed in the porous base material and causes the first surface and the second surface to communicate with each other, and
a heat-resistant layer to cover at least the first surface and a surface of the hole, the heat-resistant layer being formed of an inorganic material and deposited by an atomic layer deposition method,
wherein a thickness of the heat-resistant layer that covers the surface of the hole is reduced as a distance from the first surface and the second surface is increased.
30. A battery, comprising:
a positive electrode;
a negative electrode;
an electrolyte layer arranged between the positive electrode and the negative electrode; and
a separator including
a porous base material including a first surface opposed to the positive electrode, a second surface opposed to the negative electrode, and a hole that is formed in the porous base material and causes the first surface and the second surface to communicate with each other, and
a heat-resistant layer to cover at least the first surface and a surface of the hole, the heat-resistant layer being formed of an inorganic material and deposited by an atomic layer deposition method,
wherein in the heat-resistant layer that covers the surface of the hole, the thickness of the heat-resistant layer provided at the center in a thickness direction of the battery separator is thinner than that of other portions of the heat-resistant layer.
31. A battery pack, comprising:
a battery including
a positive electrode,
a negative electrode,
an electrolyte layer arranged between the positive electrode and the negative electrode, and
a separator including
a porous base material including a first surface opposed to the positive electrode, a second surface opposed to the negative electrode, and a hole that is formed in the porous base material and causes the first surface and the second surface to communicate with each other, and
a heat-resistant layer to cover at least the first surface and a surface of the hole, the heat-resistant layer being formed of an inorganic material and deposited by an atomic layer deposition method;
a control unit configured to control charge and discharge of the battery; and
a package body configured to support the battery and the control unit,
wherein a thickness of the heat-resistant layer that covers the surface of the hole is reduced as a distance from the first surface and the second surface is increased.
32. A battery pack, comprising:
a battery including
a positive electrode,
a negative electrode,
an electrolyte layer arranged between the positive electrode and the negative electrode, and
a separator including
a porous base material including a first surface opposed to the positive electrode, a second surface opposed to the negative electrode, and a hole that is formed in the porous base material and causes the first surface and the second surface to communicate with each other, and
a heat-resistant layer to cover at least the first surface and a surface of the hole, the heat-resistant layer being formed of an inorganic material and deposited by an atomic layer deposition method;
a control unit configured to control charge and discharge of the battery; and
a package body configured to support the battery and the control unit,
wherein in the heat-resistant layer that covers the surface of the hole, the thickness of the heat-resistant layer provided at the center in a thickness direction of the battery separator is thinner than that of other portions of the heat-resistant layer.
33. An electronic apparatus, comprising:
a battery including
a positive electrode,
a negative electrode,
an electrolyte layer arranged between the positive electrode and the negative electrode, and
a separator including
a porous base material including a first surface opposed to the positive electrode, a second surface opposed to the negative electrode, and a hole that is formed in the porous base material and causes the first surface and the second surface to communicate with each other, and
a heat-resistant layer to cover at least the first surface and a surface of the hole, the heat-resistant layer being formed of an inorganic material and deposited by an atomic layer deposition method; and
a power receiving circuit configured to receive power supply from the battery,
wherein a thickness of the heat-resistant layer that covers the surface of the hole is reduced as a distance from the first surface and the second surface is increased.
34. An electronic apparatus, comprising:
a battery including
a positive electrode,
a negative electrode,
an electrolyte layer arranged between the positive electrode and the negative electrode, and
a separator including
a porous base material including a first surface opposed to the positive electrode, a second surface opposed to the negative electrode, and a hole that is formed in the porous base material and causes the first surface and the second surface to communicate with each other, and
a heat-resistant layer to cover at least the first surface and a surface of the hole, the heat-resistant layer being formed of an inorganic material and deposited by an atomic layer deposition method; and
a power receiving circuit configured to receive power supply from the battery,
wherein in the heat-resistant layer that covers the surface of the hole, the thickness of the heat-resistant layer provided at the center in a thickness direction of the battery separator is thinner than that of other portions of the heat-resistant layer.