Apparatus, secondary battery, manufacturing method, and electronic device
View Patent ↗A lithium-ion secondary battery having stable charge characteristics and lifetime characteristics is manufactured. Before the secondary battery is completed, a positive electrode is subjected to an electrochemical reaction in a large amount of electrolyte solution in advance, so that the positive electrode can have stability. The use of the positive electrode enables the secondary battery to be highly reliable. If a negative electrode is also subjected to an electrochemical reaction in a large amount of electrolyte solution in advance, the secondary battery can be more highly reliable.
1. A manufacturing method of an electrode, comprising the steps of:
putting a first electrode, a second electrode and a third electrode in an electrolyte solution;
applying a first potential to the first electrode in the electrolyte solution; and
applying a second potential to the second electrode and a third potential to the third electrode after applying the first potential to the first electrode,
wherein the electrolyte solution comprises a lithium ion and an ion of an alkali metal element other than lithium,
wherein the first potential is higher than or equal to a lithium equilibrium potential and lower than an equilibrium potential of the alkali metal element,
wherein the second potential is lower than the third potential, and
wherein a metal of the alkali metal element other than lithium is deposited during the application of the first potential.
2. The manufacturing method, according to claim 1 , wherein the alkali metal element other than lithium is sodium or potassium.
3. The manufacturing method according to claim 1 ,
wherein the first electrode comprises the alkali metal element other than lithium, and
wherein the second electrode comprises a lithium metal.
4. The manufacturing method according to claim 1 , wherein the third electrode comprises an active material particle.
5. The manufacturing method according to claim 4 , wherein the active material particle is a positive electrode active material particle.
6. The manufacturing method according to claim 1 ,
wherein a lithium metal is deposited during the application of the second potential and the third potential, and
wherein current flows from the second electrode to the third electrode during the application of the second potential and the third potential.
7. The manufacturing method according to claim 1 , wherein current flows from the first electrode to the second electrode during the application of the first potential.
8. The manufacturing method according to claim 1 ,
wherein the alkali metal element other than lithium is deposited on a surface of the first electrode during the application of the first potential, and
wherein the alkali metal element other than lithium deposited on the surface of the first electrode reacts with an impurity during the application of the second potential and the third potential.
9. A manufacturing method of a secondary battery, comprising the steps of:
putting a first electrode, a second electrode and a third electrode in a first electrolyte solution, the third electrode comprising a positive electrode active material layer or a negative electrode active material layer;
applying a first potential to the first electrode;
applying a second potential to the second electrode and a third potential to the third electrode in the first electrolyte solution to cause an electrochemical reaction after applying the first potential;
packing a stack including the third electrode and a fourth electrode in a region surrounded by an exterior body having an opening after applying the second potential and the third potential;
putting a second electrolyte solution into the region surrounded by the exterior body after packing the stack; and
closing the opening of the exterior body after putting the second electrolyte solution,
wherein the fourth electrode comprises an active material layer,
wherein the first electrolyte solution comprises a lithium ion and an ion of an alkali metal element other than lithium, and
wherein a metal of the alkali metal element other than lithium is deposited during the application of the first potential.
10. The manufacturing method according to claim 9 , wherein the fourth electrode comprises a negative electrode active material.
11. The manufacturing method according to claim 9 ,
wherein the alkali metal element other than lithium is deposited on a surface of the first electrode during the application of the first potential, and
wherein the alkali metal element other than lithium deposited on the surface of the first electrode reacts with an impurity during the application of the second potential and the third potential.
12. The manufacturing method according to claim 9 ,
wherein a lithium metal is deposited during the application of the second potential and the third potential, and
wherein current flows from the second electrode to the third electrode during the application of the second potential and the third potential.