Battery member, method for manufacturing battery member, and secondary battery
A battery member includes: a current collector; an electrode mixture layer provided on the current collector; and an electrolyte layer provided on the electrode mixture layer, in which the electrode mixture layer contains an electrode active material, an organic solvent, a polymer, and an electrolyte salt, and the electrolyte layer contains a polymer, an oxide particle, and an electrolyte salt.
1. A battery member comprising:
a current collector;
an electrode mixture layer provided on the current collector; and
an electrolyte layer provided on the electrode mixture layer,
wherein the electrode mixture layer comprises an electrode active material, an organic solvent, and an electrolyte salt,
the electrolyte layer is a pre-formed electrolyte sheet and comprises a polymer, an oxide particle, and an electrolyte salt,
wherein the polymer comprises a copolymer comprising a first structural unit selected from the group consisting of tetrafluoroethylene and vinylidene fluoride; and a second structural unit selected from the group consisting of hexafluoropropylene, acrylic acid, maleic acid, ethyl methacrylate, and methyl methacrylate, and
wherein a content of the first structural unit is 80% by mass or more based on a sum of contents of the first structural unit and the second structural unit.
2. The battery member according to claim 1 , wherein the organic solvent comprises a carbonic acid ester.
3. The battery member according to claim 1 , wherein the electrode mixture layer further comprises a polymer capable of gelling the organic solvent.
4. A secondary battery comprising the battery member according to claim 1 .
5. A method for manufacturing a battery member, the method comprising:
a step (a) of adding a composition comprising an organic solvent and an electrolyte salt into an electrode active material layer to form an electrode mixture layer, wherein the electrode active material layer comprises an electrode active material and is provided on a current collector; and
a step (b) of providing an electrolyte layer comprising a polymer, an oxide particle, and an electrolyte salt on the electrode mixture layer,
wherein the electrolyte layer is formed in a sheet form in advance of providing the electrolyte layer on the electrode mixture layer,
wherein the polymer comprises a copolymer comprising a first structural unit selected from the group consisting of tetrafluoroethylene and vinylidene fluoride; and a second structural unit selected from the group consisting of hexafluoropropylene, acrylic acid, maleic acid, ethyl methacrylate, and methyl methacrylate, and
wherein a content of the first structural unit is 80% by mass or more based on a sum of contents of the first structural unit and the second structural unit.
6. The method according to claim 5 , wherein the organic solvent comprises a carbonic acid ester.
7. The method according to claim 5 , wherein the composition further comprises a polymer capable of gelling the organic solvent.
8. The method according to claim 7 , further comprising a step of heating the composition before the step (a).
9. The method according to claim 5 , wherein the composition further comprises a polymerizable compound, and
the polymerizable compound is a compound that becomes a polymer capable of gelling the organic solvent by polymerization.
10. The method according to claim 9 , further comprising a step of polymerizing the polymerizable compound in the electrode mixture layer after the step (b).
11. The method according to claim 5 , wherein the step (b) is performed subsequently to the step (a).