Anode and battery

Patent metadata

Field	Value
Publication number	US-10141562-B2
Application number	US-93288507-A
Country	US
Kind code	B2
Filing date	Oct 31, 2007
Priority date	Dec 18, 2006
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A battery capable of improving the cycle characteristics is provided. The battery includes a cathode, an anode, and an electrolytic solution. The anode includes an anode active material layer containing an anode active material having silicon as an element, and a coating layer that coats the anode active material layer, and contains an oxide of a 3d transition metal element at least one selected from the group consisting of iron, cobalt, and nickel.

First claim

The invention is claimed as follows:

1. An anode comprising:
an anode active material layer having opposed first and second surfaces and containing an anode active material comprising a silicon material; and
a coating layer formed by vapor-phase deposition that coats the first surface of the anode active material layer, the coating layer containing an oxide selected from the group consisting of FeO, CoO, NiO and combinations thereof,
wherein the silicon material is
an alloy of silicon including at least one selected from the group consisting of tin, cobalt, manganese, zinc, indium, silver, germanium, bismuth and chromium, or
a compound of silicon including oxygen and carbon.

2. The anode according to claim 1 , wherein a thickness of the coating layer is in a range from 10 nm to 3000 nm.

3. The anode according to claim 1 , wherein the anode active material layer has a multilayer structure formed by forming a film multiple times.

4. The anode according to claim 1 , wherein:
the anode active material comprises oxygen; and
an oxygen content in the anode active material is in a range from 3 atomic % to 40 atomic %.

5. The anode according to claim 1 , wherein:
the anode active material layer comprises a plurality of layers including an oxygen-containing layer in which the anode active material comprises oxygen; and
an oxygen content in the oxygen-containing layer is higher than an oxygen content in at least one of the plurality of layers other than the oxygen-containing layer.

6. The anode according to claim 1 , wherein:
the anode active material layer comprises a plurality of layers including a metal-element-containing layer in which the anode active material comprises at least one metal element selected from the group consisting of iron, cobalt, nickel, titanium, chromium, and molybdenum; and
a content of the metal element in the metal-element-containing layer is higher than a content of the metal element in at least one of the plurality of layers other than the metal-element-containing layer.

7. The anode according to claim 1 further comprising:
an anode current collector supporting the anode active material layer, wherein a surface of the anode current collector opposed to the anode active material layer is roughened by microparticles formed by electrolytic process.

8. The anode according to claim 7 , wherein ten point height of roughness profile Rz of the surface of the anode current collector is in a range from 1.5 μm to 5 μm.

9. A battery comprising a cathode, an anode, and an electrolytic solution,
wherein the anode comprises an anode active material layer having opposed first and second surfaces and containing an anode active material comprising a silicon material, and
a coating layer formed by vapor-phase deposition that coats the first surface of the anode active material layer, the coating layer containing an oxide selected from the group consisting of FeO, CoO, NiO and combinations thereof,
wherein the silicon material is
an alloy of silicon including at least one selected from the group consisting of tin, cobalt, manganese, zinc, indium, silver, germanium, bismuth and chromium, or
a compound of silicon including oxygen and carbon.

10. The battery according to claim 9 , wherein a thickness of the coating layer is in a range from 10 nm to 3000 nm.

11. The battery according to claim 9 , wherein the anode active material layer has a multilayer structure formed by forming a film multiple times.

12. The battery according to claim 9 , wherein:
the anode active material comprises oxygen; and
an oxygen content in the anode active material is in a range from 3 atomic % to 40 atomic %.

13. The battery according to claim 9 , wherein:
the anode active material layer comprises a plurality of layers including an oxygen-containing layer in which the anode active material comprises oxygen; and
an oxygen content in the oxygen-containing layer is higher than an oxygen content in at least one of the plurality of layers other than the oxygen-containing layer.

14. The battery according to claim 9 , wherein:
the anode active material layer comprises a plurality of layers including a metal-element-containing layer in which the anode active material comprises at least one metal element selected from the group consisting of iron, cobalt, nickel, titanium, chromium, and molybdenum; and
a content of the metal element in the metal-element-containing layer is higher than a content of the metal element in at least one of the plurality of layers other than the metal-element-containing layer.

15. The battery according to claim 9 , wherein the anode further comprises:
an anode current collector supporting the anode active material layer, wherein a surface of the anode current collector opposed to the anode active material layer is roughened by microparticles formed by electrolytic process.

16. The battery according to claim 15 , wherein ten point height of roughness profile Rz of the surface of the anode current collector is in a range from 1.5 μm to 5 μm.

17. The battery according to claim 9 , wherein the electrolytic solution contains a solvent containing sultone.

18. The battery according to claim 17 , wherein the sultone is 1,3-propene sultone.

19. The battery according to claim 9 , wherein the electrolytic solution contains a solvent containing cyclic ester carbonate having an unsaturated bond.

20. The battery according to claim 19 , wherein the cyclic ester carbonate having an unsaturated bond is vinylene carbonate or vinyl ethylene carbonate.

21. The battery according to claim 9 , wherein the electrolytic solution contains a solvent containing fluorinated ester carbonate.

22. The battery according to claim 21 , wherein the fluorinated ester carbonate is difluoroethylene carbonate.

23. The battery according to claim 9 , wherein the electrolytic solution contains an electrolyte salt having boron and fluorine as an element.

24. The battery according to claim 23 , wherein the electrolyte salt is lithium tetrafluoroborate.

25. The battery according to claim 9 , wherein the cathode, the anode, and the electrolytic solution are contained inside a cylindrical or square package member.

26. The battery according to claim 25 , wherein the package member contains iron or an iron alloy.

27. The battery according to claim 4 , wherein at least part of the oxygen in the anode active material is bonded to part of the silicon in a form of silicon monoxide, silicon dioxide, or a metastable state.

28. The battery according to claim 13 , wherein at least part of the oxygen in the anode active material is bonded to part of the silicon in a form of silicon monoxide, silicon dioxide, or a metastable state.

29. The anode according to claim 1 , wherein the second surface is in contact with an anode current collector.

30. The battery according to claim 9 , wherein the second surface is in contact with an anode current collector.

31. The anode according to claim 1 , wherein the coating layer contains FeO.

32. The anode according to claim 1 , wherein the coating layer contains CoO.

33. The anode according to claim 1 , wherein the silicon material is an alloy of silicon including tin.

34. The anode according to claim 1 , wherein the silicon mat

Assignees

• Hirose Takakazu
• Iwama Masayuki
• Kawase Kenichi
• Murata Manufacturing Co

Inventors

• Hirose Takakazu
• Iwama Masayuki
• Kawase Kenichi

Classifications

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M4/1395

  of electrodes based on metals, Si or alloys · CPC title

• H01M10/05

  Accumulators with non-aqueous electrolyte (H01M10/39 takes precedence) · CPC title

• H01M10/0569

  characterised by the solvents · CPC title

• H01M4/134 Primary

  Electrodes based on metals, Si or alloys · CPC title