Method of manufacturing lithium ion secondary battery
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTakashi Miura, Masanori Kitayoshi
Life of this patent
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Abstract
Provided is a method of manufacturing a lithium ion secondary battery. The method includes a step of initially charging the battery. The step includes: a first step of charging the battery such that a voltage Vt of the battery is increased to a first voltage Vh which is in a lower decomposition range Ad; a second step of holding the voltage Vt of the battery at the first voltage Vh; and a third step of charging the battery to a second voltage Ve, which is higher than the first voltage Vh, after the second step.
Claims11
A method of manufacturing a lithium ion secondary battery, the lithium ion secondary battery including a positive electrode that includes a positive electrode active material layer containing positive electrode active material particles, a negative electrode, and a nonaqueous electrolytic solution that contains a compound containing fluorine, the positive electrode active material particles having a surface on which a film containing fluorine and phosphorus is formed, the positive electrode active material layer including particles of at least one of a metal phosphate and a metal pyrophosphate, and the method comprising:
- initially charging the lithium ion secondary battery, the initial charging including:
- a first step of charging the lithium ion secondary battery such that a voltage of the lithium ion secondary battery is increased to a first voltage which is in a lower decomposition range of the nonaqueous electrolytic solution;
- a second step of applying a voltage to the lithium ion secondary battery so as to hold the voltage of the lithium ion secondary battery at the first voltage for a predetermined holding period in a range of 10 to 90 minutes;
- and
- a third step of charging the lithium ion secondary battery to a second voltage, which is higher than the first voltage, after the second step,
- wherein negative electrode active material of the negative electrode includes graphite while the initial charging occurs.
A method of initially charging a lithium ion secondary battery, the lithium ion secondary battery including a positive electrode that includes a positive electrode active material layer containing positive electrode active material particles, a negative electrode, and a nonaqueous electrolytic solution that contains a compound containing fluorine, the positive electrode active material particles having a surface on which a film containing fluorine and phosphorus is formed, the positive electrode active material layer including particles of at least one of a metal phosphate and a metal pyrophosphate, and the method comprising:
- a first step of charging the lithium ion secondary battery such that a voltage of the lithium ion secondary battery is increased to a first voltage which is in a lower decomposition range of the nonaqueous electrolytic solution;
- a second step of applying a voltage to the lithium ion secondary battery so as to hold the voltage of the lithium ion secondary battery at the first voltage for a predetermined holding period in a range of 10 to 90 minutes;
- and
- a third step of charging the lithium ion secondary battery to a second voltage, which is higher than the first voltage, after the second step,
- wherein negative electrode active material of the negative electrode includes graphite while the initial charging occurs.
Dependencies are inferred from the claim text.