Solid electrolyte battery

1. A solid electrolyte battery comprising:

a positive electrode;

a negative electrode disposed opposite to said positive electrode;

a separator disposed between said positive electrode and said negative electrode; and

a solid electrolyte disposed between said positive electrode and said separator and between said separator and said negative electrode;

wherein said solid electrolyte comprises a mixture of a polymer and a swelling solvent present in a ratio of from 1:5 to 1:10;

wherein said separator comprises a polyolefin porous film having a thickness of from 5 μm to 15 μm and a volume porosity of from 25% to 60%;

wherein the impedance in said solid electrolyte battery is greater than the impedance realized at the room temperature when the temperature of said solid electrolyte battery is from 100° C. to 160° C.; and

wherein said solid electrolyte has a thickness of from 5 μm to 19 μm.

2. A solid electrolyte battery according to claim 1 , wherein said porous polyolefin film contains polyethylene.

3. A solid electrolyte battery according to claim 1 , wherein said solid electrolyte is a gel electrolyte containing swelling solvent.

4. A solid electrolyte battery according to claim 1 , wherein said electrodes consist of a positive electrode using lithium ions as electrode reaction species and a negative electrode constituted by a carbonaceous material.

5. A solid electrolyte battery according to claim 3 , wherein said solid electrolyte is a gel electrolyte containing ethylene carbonate, propylene carbonate and LiPF 6 .

6. A solid electrolyte battery according to claim 5 , wherein said solid electrolyte is a gel electrolyte further containing vinylene carbonate and/or 2,4-difluoroanisol.

7. A solid electrolyte battery according to claim 6 , wherein the content of each of vinylene carbonate and 2,4-difluoroanisol is not greater than 5 wt % of the overall weight of said electrolyte.

8. A solid electrolyte battery according to claim 7 , wherein a gel electrolyte is employed which is constituted by polyvinylidene fluoride or a copolymer of polyvinylidene fluoride.

9. A solid electrolyte battery according to claim 8 , wherein a polymer is used which contains polyvinylidene fluoride and polyhexafluoropropylene.

10. A solid electrolyte battery according to claim 9 , wherein said gel electrolyte is composed of a copolymer constituted by polyvinylidene fluoride and polyhexafluoropropylene such that polyhexafluoropropylene is contained in a quantity greater than 8 wt %.

11. A solid electrolyte battery comprising:

a positive electrode comprising a lithium ion as an electrode reaction species;

a negative electrode, disposed opposite to said positive electrode, said negative electrode comprising a carbonaceous material;

a separator, disposed between said positive electrode and said negative electrode, said separator comprising a polyolefin porous film having a thickness of from 5 μm to 15 μm and a volume porosity of from 25% to 60%; and

a solid electrolyte, with a thickness of from 5 μm to 19 μm, disposed between said positive electrode and said separator and between said separator and said negative electrode, said solid electrolyte comprising (a) an electrolyte salt comprising LiPF 6 ; (b) a matrix polymer comprising at least one compound selected from the group consisting of polyvinylidene fluoride and polyhexafluoropropylene; and (c) a swelling solvent, present at a ratio of matrix polymer to swelling solvent of 1:5 to 1:10, said swelling solvent comprising (i) at least one compound selected from the group consisting of ethylene carbonate, propylene carbonate, and γ-butylolactone and (ii) vinylene carbonate and/or 2,4-difluoroanisol present at not greater than 5 wt % of the overall weight of said electrolyte;

wherein the impedance in said solid electrolyte battery is greater than the impedance realized at the room temperature when the temperature of said solid electrolyte battery is from 100° C. to 160° C.