Anode and secondary battery

Patent metadata

Field	Value
Publication number	US-9831498-B2
Application number	US-201414302531-A
Country	US
Kind code	B2
Filing date	Jun 12, 2014
Priority date	Mar 28, 2008
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

A secondary battery capable of improving cycle characteristics is provided. An anode includes: an anode active material layer on an anode current collector, the anode active material layer including a plurality of anode active material particles, in which the average particle area of the plurality of anode active material particles observed from a surface of the anode active material layer is within a range of 1 μm 2 to 60 μm 2 both inclusive.

First claim

What is claimed is:

1. An anode comprising:
an anode active material layer on an anode current collector, the anode active material layer including a plurality of anode active material particles,
wherein,
the average particle area of the plurality of anode active material particles observed from a surface of the anode active material layer is within a range of and including 1 μm 2 to 60 μm 2 ,
the average circularity of the plurality of anode active material particles is within a range of and including 0.4 to 0.8, and
an area ratio of the total sum of the particle areas of anode active material particles having a particle area of 20 μm 2 to 30 μm 2 , both inclusive, to the total sum of the particle areas of the plurality of the anode active material particles is within a range of 10% to 60%, both inclusive.

2. The anode according to claim 1 , wherein the average particle area is within a range of and including 2 μm 2 to 40 μm 2 .

3. The anode according to claim 2 , wherein the average particle area is within a range of and including 5 μm 2 to 17 μm 2 .

4. The anode according to claim 1 , wherein the anode active material layer is formed by a vapor-phase method, a liquid-phase method, a sintering method or a spraying method.

5. The anode according to claim 1 , wherein the anode active material particles include at least one kind selected from the group consisting of a simple substance, alloys and compounds of silicon.

6. The anode according to claim 1 , wherein the anode active material layer includes a plurality of layers of two kinds having different oxygen contents in a thickness direction.

7. The anode according to claim 1 , wherein the anode active material layer is alloyed with the anode current collector.

8. A secondary battery comprising:
a cathode;
an anode; and
an electrolyte,
wherein,
the anode includes an anode active material layer on an anode current collector, the anode active material layer including a plurality of anode active material particles,
the average particle area of the plurality of anode active material particles observed from a surface of the anode active material layer is within a range of and including 1 μm 2 to 60 μm 2 ,
the average circularity of the plurality of anode active material particles is within a range of and including 0.4 to 0.8, and
an area ratio of the total sum of the particle areas of anode active material particles having a particle area of 20 μm 2 to 30 μm 2 , both inclusive, to the total sum of the particle areas of the plurality of the anode active material particles is within a range of 10% to 60%, both inclusive.

9. The secondary battery according to claim 8 , wherein the average particle area is within a range of and including 2 μm 2 to 40 μm 2 .

10. The secondary battery according to claim 9 wherein the average particle area is within a range of and including 5 μm 2 to 17 μm 2 .

11. The secondary battery according to claim 8 wherein the anode active material layer is formed by a vapor-phase method, a liquid-phase method, a sintering method or a spraying method.

12. The secondary battery according to claim 8 , wherein the anode active material particles include at least one kind selected from the group consisting of a simple substance, alloys and compounds of silicon.

13. The secondary battery according to claim 8 , wherein the anode active material layer includes a plurality of layers of two kinds having different oxygen contents in a thickness direction.

14. The secondary battery according to claim 8 , wherein the anode active material layer is alloyed with the anode current collector.

Assignees

• Sony Corp

Inventors

• Adachi Momoe
• Kurasawa Shunsuke
• Konishiike Isamu
• Kawase Kenichi

Classifications

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/04

  Processes of manufacture in general · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M4/386 Primary

  Silicon or alloys based on silicon · CPC title