POWER STORAGE DEVICE AND METHOD FOR CHARGING THE SAME

• US 20140176076A1
• Filed: 12/16/2013
• Published: 06/26/2014
• Est. Priority Date: 12/26/2012
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: MOMO, Junpei, Miyake, Hiroyuki, Takahashi, Kei
• Granted Patent: US 9,461,341 B2
• Time in Patent Office: Days
• US Class Current: 320/128
• CPC Class Codes: H01M 10/02 Details of electrodes H01M4/00; of non-active parts H01M50/00
• CPC Class Codes: H01M 10/045 Cells or batteries with folded plate-like electrodes
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0583 of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
• CPC Class Codes: H01M 10/0585 of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• CPC Class Codes: H01M 10/4242 Regeneration of electrolyte or reactants
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 2004/025 with shapes other than plane or cylindrical
• CPC Class Codes: H01M 2010/4271 Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
• CPC Class Codes: H01M 4/96 Carbon-based electrodes
• CPC Class Codes: H01M 50/46 Separators, membranes or diaphragms characterised by their combination with electrodes
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence
• CPC Class Codes: H02J 7/007 Regulation of charging or discharging current or voltage
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/50 Fuel cells
• CPC Class Codes: Y02P 70/50 : Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries

Abstract

A decrease in the capacity of a power storage device is inhibited by adjusting or reducing imbalance in the amount of inserted and extracted carrier ions between positive and negative electrodes, which is caused by decomposition of an electrolyte solution of the negative electrode. Further, the capacity of the power storage device can be restored. Furthermore, impurities in the electrolyte solution can be decomposed with the use of the third electrode. A power storage device including positive and negative electrodes, an electrolyte, and a third electrode is provided. The third electrode has an adequate electrostatic capacitance. The third electrode can include a material with a large surface area. In addition, a method for charging the power storage device including the steps of performing charging by applying a current between the positive and negative electrodes, and performing additional applying a current between the third electrode and the negative electrode is provided.

Claims

1. A power storage device comprising:

a positive electrode;

a negative electrode;

a third electrode comprising a material which has a specific surface area of 500 m²/g or larger; and

an electrolyte.

2. The power storage device according to claim 1, wherein the negative electrode is sandwiched between the positive electrode and the third electrode.

3. The power storage device according to claim 1, wherein the positive electrode is sandwiched between the negative electrode and the third electrode.

4. The power storage device according to claim 1,

wherein a main surface of the third electrode is perpendicular to a main surface of the positive electrode and a main surface of the negative electrode.

5. The power storage device according to claim 1, further comprising a fourth electrode comprising a material which has a specific surface area of 500 m²/g or larger,

wherein the fourth electrode is provided so that the positive electrode and the negative electrode are interposed between the third electrode and the fourth electrode.

6. The power storage device according to claim 1, wherein the third electrode comprises activated carbon.

7. The power storage device according to claim 1, wherein the electrolyte comprises a lithium salt.

8. An electrical device comprising a control circuit and the power storage device according to claim 1.

9. The electrical device according to claim 8,

wherein the negative electrode is configured to be electrically connected to the positive electrode during first charging,

wherein the negative electrode is configured to be electrically connected to the third electrode during second charging, and

wherein the second charging leads to change of a potential difference between the negative electrode and the third electrode.

10. A method for charging a power storage device, comprising a positive electrode, a negative electrode, and a third electrode, the method comprising the steps of:

charging the power storage device by applying a current between the positive electrode and the negative electrode; and

performing additional charging by applying a current between the third electrode and the negative electrode.

11. The method for charging a power storage device, according to claim 10, wherein the third electrode comprises a material which has a specific surface area of 500 m²/g or larger.

12. The method for charging a power storage device, according to claim 10, wherein the third electrode comprises activated carbon.

13. The method for charging a power storage device, according to claim 10, further comprising the step of:

discharging the third electrode by self-discharge after the additional charging.

14. The method for charging a power storage device, according to claim 10,

wherein the power storage device further comprises an electrolyte, and

wherein the electrolyte comprises a lithium salt.

15. The method for charging a power storage device, according to claim 10,

wherein the step of applying a current is performed under a first voltage,

wherein the step of performing additional charging is performed under a second voltage, and

wherein the second voltage is higher than the first voltage.

16. The method for charging a power storage device, according to claim 10, wherein the additional charging leads to change a potential of the third electrode.

17. The method for charging a power storage device, according to claim 10, wherein the negative electrode is configured to be electrically contacted to the third electrode during the additional charging.