Electrolyte composition and rechargeable battery
There is disclosed an electrolyte composition comprising one or two or more polymers, oxide particles having a hydrophobic surface, at least one electrolyte salt selected from the group consisting of a lithium salt, a sodium salt, a calcium salt, and a magnesium salt, and an ionic liquid.
1. An electrolyte composition comprising:
at least one matrix polymer;
SiO 2 particles having a hydrophobic surface and a specific surface area of 2 m 2 /g or more and 35 m 2 /g or less;
at least one electrolyte salt selected from the group consisting of a lithium salt, a sodium salt, a calcium salt, and a magnesium salt; and
an ionic liquid.
2. The electrolyte composition according to claim 1 , wherein the SiO 2 particles are surface-treated with a silicon-containing compound.
3. The electrolyte composition according to claim 2 , wherein the silicon-containing compound is at least one selected from the group consisting of an alkoxy silane, an epoxy group-containing silane, an amino group-containing silane, a (meth)acryloyl group-containing silane, a silazane, and a siloxane.
4. The electrolyte composition according to claim 1 , wherein the ionic liquid comprises, as a cationic component, at least one selected from the group consisting of a quaternary onium cation in a chain form, a piperidinium cation, a pyrrolidinium cation, a pyridinium cations, and an imidazolium cation.
5. The electrolyte composition according to claim 1 , wherein the ionic liquid comprises, as an anionic component, at least one of anionic components represented by the following formula (A):
N(SO 2 C m F 2m+1 )(SO 2 C n F 2n+1 ) − (A)
where m and n each independently represent an integer of 0 to 5.
6. The electrolyte composition according to claim 1 , wherein the at least one matrix polymer has a first structural unit selected from the group consisting of a tetrafluoroethylene and a vinylidene fluoride.
7. The electrolyte composition according to claim 6 , wherein the first structural unit and a second structural unit selected from the group consisting of a hexafluoropropylene, an acrylic acid, a maleic acid, an ethyl methacrylate, and a methyl methacrylate are comprised in structural units constituting the at least one matrix polymer.
8. The electrolyte composition according to claim 1 , wherein the electrolyte salt is an imide-based lithium salt.
9. A secondary battery comprising:
a positive electrode;
a negative electrode; and
an electrolyte layer comprising the electrolyte composition according to claim 1 provided between the positive electrode and the negative electrode.
10. A method for producing an electrolyte sheet, the method comprising:
obtaining a slurry by dispersing the electrolyte composition according to claim 1 in a dispersion medium; and
obtaining the electrolyte sheet by applying the slurry on a base material and then volatilizing the dispersion medium.
11. An electrolyte sheet produced by a method comprising:
obtaining a slurry by dispersing the electrolyte composition according to claim 1 in a dispersion medium; and
obtaining the electrolyte sheet by applying the slurry on a base material and then volatilizing the dispersion medium.
12. The electrolyte sheet according to claim 11 , wherein the electrolyte sheet does not include a separator.