ELECTROCHEMICAL DEVICE
First Claim
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1. A method for charging or discharging a sodium-ion secondary battery comprising the steps of:
- supplying a first current between a first electrode and a second electrode in a first direction; and
supplying a second current between the first electrode and the second electrode in a direction opposite to the first direction,wherein charge or discharge is performed by alternately supplying the first current and the second current, andwherein one period in which the second current is supplied is shorter than one period in which the first current is supplied.
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Abstract
Deterioration of a battery is prevented or the degree of deterioration of a battery is reduced, and charge and discharge performance of the battery is maximized and the charge and discharge performance of the battery is maintained for a long time. In a battery such as a sodium-ion secondary battery, various malfunctions or deterioration is caused by a reaction product deposited on an electrode surface. The reaction product is dissolved by applying a signal (inversion pulse current) to make a current flow in a direction opposite to a direction in which the reaction product is formed more than once in charging or discharging.
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Citations
14 Claims
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1. A method for charging or discharging a sodium-ion secondary battery comprising the steps of:
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supplying a first current between a first electrode and a second electrode in a first direction; and supplying a second current between the first electrode and the second electrode in a direction opposite to the first direction, wherein charge or discharge is performed by alternately supplying the first current and the second current, and wherein one period in which the second current is supplied is shorter than one period in which the first current is supplied. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for maintaining a battery, the battery comprising:
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a first electrode; and a second electrode, wherein the first electrode or the second electrode comprises sodium, the method comprising; supplying a first current between the first electrode and the second electrode in a first direction; and supplying a second current between the first electrode and the second electrode in a direction opposite to the first direction, wherein charge or discharge is performed by alternately supplying the first current and the second current, and wherein one period in which the second current is supplied is shorter than one period in which the first current is supplied. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A sodium-ion secondary battery comprising:
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a positive electrode; and a negative electrode, wherein a sodium deposit does not substantially exist on a surface of the negative electrode after charge and discharge. - View Dependent Claims (14)
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Specification