Battery with anode active material with oxide coating on active particles

Patent metadata

Field	Value
Publication number	US-10205163-B2
Application number	US-201615196316-A
Country	US
Kind code	B2
Filing date	Jun 29, 2016
Priority date	May 23, 2006
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

A battery including an anode with an anode active material layer that includes anode active material particles made of an anode active material including at least one of silicon and tin as an element. An oxide-containing film including an oxide of at least one kind selected from the group consisting of silicon, germanium and tin is formed in a region of the surface of each anode active material particle in contact with an electrolytic solution by a liquid-phase method such as a liquid-phase deposition method. The region in contact with the electrolytic solution of the surface of each anode active material particle is covered with the oxide-containing film. The thickness of the oxide-containing film is preferably within a range from 0.1 nm to 500 nm both inclusive.

First claim

What is claimed is:

1. A lithium-ion battery comprising a cathode, an anode and an electrolyte, wherein:
the anode includes an anode current collector and an anode active material layer on the anode current collector,
the anode active material layer includes first anode active material particles each including silicon (Si) as an element, tin as an element, or both, and
each first anode active material particle is coated by an oxide-containing film deposited thereon, the oxide-containing film including an oxide of silicon, the oxide-containing film coating the anode active material particle in a region that, but for the oxide-containing film, would be in contact with the electrolyte,
the oxide-containing film has a thickness of 0.1 nm to 500 nm, both inclusive, and
the oxide-containing film includes (a) a fluorine anion or (b) a compound including fluorine and a Group 13 element, a Group 14 element, or a Group 15 element.

2. The lithium-ion battery according to claim 1 , wherein the thickness of the oxide-containing film is within a range from 1 nm to 200 nm both inclusive.

3. The lithium-ion battery according to claim 1 , wherein the oxide-containing film is formed by a liquid-phase deposition method, a sol-gel method, a coating method, or a dip coating method.

4. The lithium-ion battery according to claim 1 , wherein the first anode active material particle includes carbon.

5. The lithium-ion battery according to claim 1 , wherein the anode active material layer includes a second active material particle including carbon.

6. The lithium-ion battery according to claim 1 , wherein the electrolyte includes a cyclic carbonate including at least one kind selected from the group consisting of 4-fluoro-1,3-dioxolane-2-one or 4,5-difluoro-1,3-dioxolane-2-one.

7. The lithium-ion battery according to claim 1 , wherein the electrolyte includes at least one kind selected from acetonitrile, glutaronitrile, adiponitrile, methoxyacetonitrile, or 3-methoxypropionitrile.

8. The lithium-ion battery according to claim 1 , wherein the electrolyte includes at least one kind selected from the group consisting of a vinylene carbonate-based compound, a vinylethylene carbonate-based compound or an ethylene methylene carbonate-based compound.

9. The lithium-ion battery according to claim 1 , wherein the electrolyte includes at least one kind selected from the group consisting of propane sultone or propene sultone.

10. The lithium-ion battery according to claim 1 , wherein the cathode includes a complex oxide including lithium and manganese.

11. The lithium-ion battery according to claim 1 , wherein the cathode includes a lithium-iron phosphate compound and a lithium-iron-manganese phosphate compound.

12. The lithium-ion battery according to claim 1 , wherein the oxide-containing film includes a fluorine ion, a tetrafluoroborate ion, a hexafluorophosphate ion, lithium hexafluorophosphate, lithium tetrafluorophosphate, hydrofluoric acid, lithium fluoride, sodium hexafluorophosphate, sodium tetrafluorophosphate, sodium fluoride, ammonium hexafluorophosphate, ammonium tetrafluorophosphate, or ammonium fluoride.

Assignees

• Sony Corp
• Murata Manufacturing Co

Inventors

• Yamaguchi Hiroyuki
• Horiuchi Hiroshi
• Kawase Kenichi
• Kubota Tadahiko
• Nakai Hideki
• Hirose Takakazu

Classifications

• H01M2300/0028

  characterised by the solvent · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/38

  of elements or alloys · CPC title