Production method of electrode for secondary battery, electrode for secondary battery, and secondary battery
The present invention relates to a production method of an electrode for a secondary battery which has an electrode laminated assembly that has a configuration in which electrodes and a separator are laminated. An insulating member is formed on border portion ( 4 ) between an application portion and a non-application portion by attaching insulating solution ( 40 a ) which contains a solid insulating material to border portion ( 4 ) and then solidifying the insulating solution ( 40 a ).
1. A production method of an electrode for a secondary battery, the secondary battery having an electrode laminated assembly that has a configuration in which electrodes and a separator are laminated,
each of the electrodes including an application portion and a non-application portion, the application portion being a portion where an active material layer is formed on a current collector, the non-application portion being a portion where the active material layer is not formed on the current collector,
the production method comprising forming an insulating member on a border portion between the application portion and the non-application portion by attaching an insulating solution to the border portion and then solidifying the insulating solution, the insulating solution containing a solid insulating material, and
a particle diameter of the solid insulating material being 50 nm to 500 nm, wherein
a resin solution is used as the insulating solution, and a metal oxide is used as the solid insulating material, and
a concentration of a resin in the resin solution is 0.5 wt % to 5 wt %, and a content of the metal oxide in the resin solution is 1 wt % to 5 wt %.
2. The production method of the electrode for the secondary battery according to claim 1 , wherein the insulating solution is discharged toward the border portion to be attached to the border portion.
3. The production method of the electrode for the secondary battery according to claim 1 , wherein one oxide from among titanium dioxide, aluminum oxide and zirconium oxide is used as the metal oxide.
4. An electrode for a secondary battery comprising:
a current collector;
an active material layer that is formed on a part of said current collector; and
an insulating member that results from attaching an insulating solution to a border portion between an application portion and a non-application portion and then solidifying the insulating solution, the insulating solution containing a solid insulating material, the application portion being a portion where said active material layer is formed on said current collector, the non-application portion being a portion where said active material layer is not formed on said current collector, and
a particle diameter of the solid insulating material being 50 nm to 500 nm, wherein
the insulating solution is a resin solution, and the solid insulating material is a metal oxide, and
a concentration of a resin in the resin solution is 0.5 wt % to 5 wt %, and a content of the metal oxide in the resin solution is 1 wt % to 5 wt %.
5. The electrode for the secondary battery according to claim 4 , wherein the solid insulating material enters a concave portion formed on a surface of said active material layer.
6. The electrode for the secondary battery according to claim 4 , wherein the metal oxide is titanium dioxide, aluminum oxide, or zirconium oxide.
7. A secondary battery comprising: an electrode laminated assembly that has a configuration in which electrodes and a separator are laminated; and an outer container that accommodates said electrode laminated assembly together with electrolyte, at least one of the electrodes included in said electrode laminated assembly being the electrode for the secondary battery according to claim 4 .