Energy storage device and manufacturing method thereof
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorMikio YUKAWA
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Abstract
An object is to provide an energy storage device capable of supplying stable voltage and easily detecting remaining capacity and charging capacity. The energy storage device includes a positive electrode, a negative electrode formed so as to face the positive electrode, and an electrolyte interposed between the positive electrode and the negative electrode, in which a discharging curve or a charging curve of the positive electrode has plateaus (also referred to as flat portions of the potential). Specifically, the discharging curve or the charging curve of the positive electrode has a plurality of plateaus, and positive electrode potential can be monitored in plural steps, whereby the remaining capacity and the charging capacity can be easily detected.
Claims14
An energy storage device comprising:
- a positive electrode;
- a negative electrode formed so as to face the positive electrode;
- and
- an electrolyte interposed between the positive electrode and the negative electrode,
- wherein a discharging curve of the positive electrode has a plurality of plateaus.
An energy storage device comprising:
- a positive electrode;
- a negative electrode formed so as to face the positive electrode;
- and
- an electrolyte interposed between the positive electrode and the negative electrode,
- wherein a charging curve of the positive electrode has a plurality of plateaus.
A method for manufacturing an energy storage device comprising:
- a positive electrode;
- a negative electrode formed so as to face the positive electrode;
- and an electrolyte interposed between the positive electrode and the negative electrode,
- wherein a process for manufacturing the positive electrode comprises:
- forming a film including an active material over a current collector using a LiFePO4 target by a sputtering method;
- and
- performing a heat treatment on the film including the active material, and
- wherein a discharging curve of the positive electrode has a plurality of plateaus.
A method for manufacturing an energy storage device comprising:
- a positive electrode;
- a negative electrode formed so as to face the positive electrode;
- and an electrolyte interposed between the positive electrode and the negative electrode,
- wherein a process for manufacturing the positive electrode comprises:
- forming a film including an active material over a current collector using a LiFePO4 target by a sputtering method;
- and
- performing a heat treatment on the film including the active material, and
- wherein a charging curve of the positive electrode has a plurality of plateaus.
Dependencies are inferred from the claim text.