Electronic device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorShunpei YAMAZAKI
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Abstract
Degradation of a battery is prevented or the degree of the degradation is reduced, and charge and discharge performance of the battery is maximized and maintained for a long time. A reaction product, which is formed on an electrode surface and causes various malfunctions and degradation of a battery such as a lithium-ion secondary battery, is dissolved by application of electrical stimulus, specifically, by applying a signal to supply a current reverse to a current with which the reaction product is formed (reverse pulse current).
Claims19
A method of charging an electronic device comprising:
- a first electrode;
- a second electrode;
- and
- an electrolytic solution between the first electrode and the second electrode,
- the method comprising:
- supplying a first current that flows between the first electrode and the second electrode in a first direction during a first period;
- and
- supplying a second current that flows between the first electrode and the second electrode in a second direction during a second period;
- wherein the first direction and the second direction are opposite to each other,
- wherein a reaction product grows on the first electrode by the supplying the first current, and
- wherein the reaction product on the first electrode is dissolved by supplying the second current.
An electronic device comprising:
- a first electrode;
- a second electrode;
- and
- an electrolytic solution between the first electrode and the second electrode,
- wherein a reaction product that grows on the first electrode due to a first current that flows between the first electrode and the second electrode for a first period is dissolved by supplying a second current reverse to the first current for a second period.
An electronic device comprising:
- a first electrode;
- a protective film that covers part of the first electrode;
- a second electrode;
- and
- an electrolytic solution between the first electrode and the second electrode,
- wherein a reaction product that grows from a region of a surface of the first electrode that is not covered with the protective film due to a first current that flows between the first electrode and the second electrode for a first period is dissolved by supplying a second current reverse to the first current for a second period.
Dependencies are inferred from the claim text.