Method for manufacturing electrode for storage battery
View Patent ↗To provide a storage battery electrode including an active material layer with high density that contains a smaller percentage of conductive additive. To provide a storage battery having a higher capacity per unit volume of an electrode with the use of the electrode for a storage battery. A slurry that contains an active material and graphene oxide is applied to a current collector and dried to form an active material layer over the current collector, the active material layer over the current collector is rolled up together with a spacer, and a rolled electrode which includes the spacer are immersed in a reducing solution so that graphene oxide is reduced.
1. A method for manufacturing an electrode for a storage battery, the method comprising the steps of:
forming a stack of an active material layer and a current collector;
rolling up the stack of the active material layer and the current collector together with a porous support to form a rolled stack comprising the porous support after forming the stack of the active material layer and the current collector;
immersing the rolled stack in a solution comprising a reducing agent after forming the rolled stack; and
separating the porous support from the stack of the active material layer and the current collector.
2. The method according to claim 1 , wherein the active material layer comprises graphene oxide.
3. The method according to claim 1 , wherein the solution comprising the reducing agent further comprises water.
4. The method according to claim 3 , wherein the solution comprising the reducing agent further comprises a solvent which has a higher boiling point than water.
5. The method according to claim 1 , wherein the solution comprising the reducing agent further comprises a pH adjuster.
6. The method according to claim 1 , further comprising the steps of:
washing the active material layer after immersing the rolled stack; and
drying the active material layer after the washing step.
7. The method according to claim 1 , wherein the reducing agent is any one of materials selected from ascorbic acid, hydrazine, dimethyl hydrazine, hydroquinone, sodium boron hydride, tetra butyl ammonium bromide, LiAlH 4 , N,N-diethylhydroxylamine and a derivative thereof.
8. The method according to claim 1 , wherein the active material layer comprises a positive electrode active material.
9. A method for manufacturing an electrode for a storage battery, the method comprising the steps of:
applying a slurry which comprises an active material and graphene oxide to a current collector;
drying the slurry to form a stack of an active material layer and the current collector;
rolling up the stack of the active material layer and the current collector together with a porous support to form a rolled stack comprising the porous support after forming the stack of the active material layer and the current collector;
immersing the rolled stack in a solution comprising a reducing agent after forming the rolled stack; and
separating the porous support from the stack of the active material layer and the current collector.
10. The method according to claim 9 , wherein the graphene oxide is reduced by the immersion step so that graphene is formed.
11. The method according to claim 9 , wherein the solution comprising the reducing agent further comprises water.
12. The method according to claim 11 , wherein the solution comprising the reducing agent further comprises a solvent which has a higher boiling point than water.
13. The method according to claim 9 , wherein the reducing agent is any one of materials selected from ascorbic acid, hydrazine, dimethyl hydrazine, hydroquinone, sodium boron hydride, tetra butyl ammonium bromide, LiAlH 4 , N,N-diethylhydroxylamine and a derivative thereof.
14. The method according to claim 13 , wherein the reducing agent is ascorbic acid.
15. The method according to claim 9 , further comprising the steps of:
washing the active material layer after immersing the rolled stack; and
drying the active material layer after the washing step.
16. The method according to claim 15 , wherein the washing step is performed by spraying a washing solution.
17. The method according to claim 9 , wherein the active material layer comprises a positive electrode active material.
18. A method for manufacturing an electrode for a storage battery, the method comprising the steps of:
applying a slurry which comprises an active material and graphene oxide to a current collector;
drying the slurry to form a stack of an active material layer and the current collector;
rolling up the stack of the active material layer and the current collector to form a rolled stack after forming the stack of the active material layer and the current collector;
immersing the rolled stack in a solution comprising a reducing agent to reduce graphene oxide after forming the rolled stack;
washing the stack of the active material layer and the current collector after immersing the rolled stack; and
drying the stack of the active material layer and the current collector after the washing step,
wherein the solution comprising the reducing agent further comprises water and a solvent which has a higher boiling point than water.
19. The method according to claim 18 , wherein the reducing agent is any one of materials selected from ascorbic acid, hydrazine, dimethyl hydrazine, hydroquinone, sodium boron hydride, tetra butyl ammonium bromide, LiAlH 4 , N,N-diethylhydroxylamine and a derivative thereof.
20. The method according to claim 18 , wherein the active material layer comprises a positive electrode active material.
21. The method according to claim 18 , wherein the solution comprising the reducing agent further comprises a pH adjuster.