Secondary battery, battery pack, vehicle, and stationary power supply
地域：
Minato-ku
摘要
According to one embodiment, a secondary battery is provided. The separator includes a porous self-supporting film, a solid electrolyte layer, and a first binder. The solid electrolyte layer is provided on one main surface of the porous self-supporting film. The porous self-supported film and the solid electrolyte layer are adhered with the first binder. The first binder exists on both of the one main surface and another main surface of the porous self-supporting film. The solid electrolyte layer includes solid electrolyte particles and a second binder. The solid electrolyte particles have alkali metal ions conductivity. The polymeric material of the second bonder is a same as the polymeric material of the first material.
說(shuō)明書
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This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2018-049978, filed Mar. 16, 2018, the entire contents of which are incorporated herein by reference.
Embodiments described herein relate generally to a secondary battery, a battery pack, a vehicle and a stationary power supply.
A nonaqueous electrolyte battery such as a lithium ion secondary battery is used as a power supply in a broad field. The forms of nonaqueous electrolyte batteries include many different forms from small batteries for various kinds of electronic devices and the like to large batteries for electric vehicles and the like.
A nonaqueous electrolyte battery includes a negative electrode containing a negative electrode active material, a positive electrode containing a positive electrode active material, a separator, and a nonaqueous electrolyte. As the negative electrode active material, for example, a carbon material or a lithium titanium oxide is used. As the positive electrode active material, for example, a layered oxide containing nickel, cobalt, manganese, and the like is used. As the separator, for example, a porous film made of a resin or a nonwoven fabric is used.
權(quán)利要求
What is claimed is:1. A separator comprising:a porous self-supporting film; a solid electrolyte layer provided on one main surface of the porous self-supporting film; and a first binder which comprises a first polymeric material and exists on both of the one main surface and another main surface of the porous self-supporting film, wherein the porous self-supporting film and the solid electrolyte layer are adhered with the first binder, the solid electrolyte layer comprises a second binder and solid electrolyte particles, and the second binder comprises a second polymeric material which is the same as the first polymeric material of the first binder. 2. The separator according to claim 1 , wherein the porous self-supporting film is a porous resin sheet or a nonwoven fabric. 3. The separator according to claim 1 , wherein the polymeric material comprises a polymer comprising a monomer unit which is a hydrocarbon with a functional group comprising at least one element selected from the group consisting of oxygen, sulfur, nitrogen, and fluorine, and a ratio of the polymer in the polymeric material comprising the monomer unit is 70 mol % or more. 4. The separator according to claim 1 , wherein the solid electrolyte particles comprise at least one of a NASICON type Li1+xAlxTi2-x(PO4)3 (0.1≤x≤0.5) and a garnet type Li7La3Zr2O12. 5. The separator according to claim 1 , wherein water absorption of the polymeric material is from 0.1% to 10%. 6. The separator according to claim 3 , wherein the polymeric material comprises a polymer made of the monomer unit, and the polymer comprises at least one material selected from the group consisting of polyvinyl formal, polyvinyl alcohol, polyvinyl butyral, polymethyl methacrylate, and polyvinylidene fluoride. 7. The separator according to claim 1 , wherein a ratio of the second binder in the solid electrolyte layer is from 1 mass % to 20 mass %. 8. The separator according to claim 1 , wherein the solid electrolyte particles have alkali metal ion conductivity. 9. An electrode group comprising:a positive electrode comprising a positive electrode active material; a negative electrode comprising a negative electrode active material; and the separator according to claim 1 which is located at least between the positive electrode and the negative electrode. 10. The electrode group according to claim 9 , wherein the solid electrolyte layer is located between the porous self-supporting film and the negative electrode. 11. The electrode group according to claim 9 , wherein the negative electrode active material comprises a compound whose lithium ion insertion/extraction potential is 1 V (vs. Li/Li+) to 3 V (vs. Li/Li+) with respect to a potential based on metal lithium. 12. The electrode group according to claim 9 , wherein the positive electrode active material comprises a compound whose lithium ion insertion/extraction potential is 2.5 V (vs. Li/Li+) to 5.5 V (vs. Li/Li+) with respect to a potential based on metal lithium. 13. A secondary battery comprising:the electrode group according to claim 9 ; and an aqueous electrolyte. 14. A battery pack comprising the secondary battery according to claim 13 . 15. The battery pack according to claim 14 , further comprising:an external power distribution terminal; and a protective circuit. 16. The battery pack according to claim 14 , which comprises plural of the secondary battery, wherein the plural of the secondary battery are electrically connected in series, in parallel, or in combination of series and parallel. 17. A vehicle comprising the battery pack according to claim 14 . 18. The vehicle according to claim 17 , which comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy. 19. A stationary power supply comprising the battery pack according to claim 14 . 20. The separator according to claim 1 , wherein the first binder is same as the second binder.
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