Anode and battery

• US 20050191547A1
• Filed: 01/20/2005
• Published: 09/01/2005
• Est. Priority Date: 01/28/2004
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kawase, Kenichi, Konishiike, Isamu, Miyaki, Yukio, Takada, Tomoo, Yamamoto, Kensuke, Iijima, Yukiko
• Granted Patent: US 9,425,441 B2
• Time in Patent Office: Days
• US Class Current: 429/137
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/446 Initial charging measures
• CPC Class Codes: H01M 2004/027 Negative electrodes
• CPC Class Codes: H01M 2300/0085 Immobilising or gelification of electrolyte
• CPC Class Codes: H01M 4/0404 by coating on electrode collectors
• CPC Class Codes: H01M 4/0471 involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/1395 of electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/36 Selection of substances as active materials, active masses, active liquids
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 4/38 of elements or alloys
• CPC Class Codes: H01M 4/386 Silicon or alloys based on silicon
• CPC Class Codes: H01M 4/387 Tin or alloys based on tin
• CPC Class Codes: H01M 4/58 of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
• CPC Class Codes: H01M 4/62 Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
• CPC Class Codes: H01M 4/66 Selection of materials
• CPC Class Codes: H01M 4/667 in the form of layers, e.g. coatings
• CPC Class Codes: H01M 50/109 of button or coin shape
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02P 70/50 : Manufacturing or production processes characterised by the final manufactured product

Abstract

Provided are an anode capable of preventing an increase in impedance and variations in characteristics and a battery using the anode. An anode active material layer includes at least one kind selected from the group consisting of simple substances, alloys and compounds of silicon and the like capable of forming an alloy with Li. The anode active material layer is formed by a vapor-phase deposition method or the like, and is alloyed with an anode current collector. A coating including lithium carbonate is formed on at least a part of a surface of the anode current collector. Thereby, an increase in impedance can be prevented. Moreover, the anode is less subject to an influence by a difference in a handling environment or storage conditions, so variations in impedance can be prevented.

Claims

1. An anode, comprising:

an anode current collector;

an anode active material layer being disposed on the anode current collector and being alloyed with the anode current collector in at least a part of an interface with the anode current collector; and

a coating including lithium carbonate on at least a part of a surface of the anode active material layer.

2. An anode, comprising:

an anode current collector;

an anode active material layer formed on the anode current collector by at least one method selected from the group consisting of a vapor-phase deposition method, a liquid-phase deposition method and a sintering method; and

a coating including lithium carbonate on at least a part of a surface of the anode active material layer.

3. An anode according to claim 2, wherein

the anode active material layer is alloyed with the anode current collector in at least a part of an interface with the anode current collector.

4. An anode according to claim 2, wherein

lithium ranging from 0.5% to 40% of the anode capacity is inserted into the anode active material layer.

5. An anode according to claim 4, wherein

lithium is inserted through depositing lithium metal by a vapor-phase deposition method.

6. An anode according to claim 2, wherein

the anode active material layer includes at least one kind selected from the group consisting of simple substances, alloys and compounds of silicon, germanium and tin.

7. An anode according to claim 2, wherein

the coating including lithium carbonate is formed through inserting lithium into the anode active material layer, and then bringing the anode active material layer into contact with carbon dioxide.

8. A battery, comprising

a cathode;

an anode; and

an electrolyte,

wherein the anode comprises;

an anode current collector;

an anode active material layer being disposed on the anode current collector and being alloyed with the anode current collector in at least a part of an interface with the anode current collector; and

a coating including lithium carbonate on at least a part of a surface of the anode active material layer.

9. A battery, comprising:

a cathode;

an anode; and

an electrolyte,

wherein the anode comprises;

an anode current collector;

an anode active material layer formed on the anode current collector by at least one method selected from the group consisting of a vapor-phase deposition method, a liquid-phase deposition method and a sintering method; and

a coating including lithium carbonate on at least a part of a surface of the anode active material layer.

10. A battery according to claim 9, wherein

the anode active material layer is alloyed with the anode current collector in at least a part of an interface with the anode current collector.

11. A battery according to claim 9, wherein

lithium ranging from 0.5% to 40% of the anode capacity is inserted into the anode active material layer.

12. A battery according to claim 9, wherein

in the anode active material layer, electrochemically active lithium remains after discharge.

13. A battery according to claim 9, wherein

the anode active material layer includes at least one kind selected from the group consisting of simple substances, alloys and compounds of silicon, germanium and tin.

14. A battery according to claim 9, wherein

the coating including lithium carbonate is formed through inserting lithium into the anode active material layer, and then bringing the anode active material layer into contact with carbon dioxide.