Battery having anode with active material layer comprising resin containing limited quantity of sulfur

Patent metadata

Field	Value
Publication number	US-9385373-B2
Application number	US-76848507-A
Country	US
Kind code	B2
Filing date	Jun 26, 2007
Priority date	Jun 29, 2006
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

A battery capable of improving the safety when the battery is broken while securing the cycle characteristics is provided. The battery includes a cathode, an anode, and an electrolyte. The anode includes an anode active material layer that has a resin containing sulfur (S). Compared to a case not having the resin containing resin, a sufficient discharge capacity can be obtained even when charge and discharge is repeated, and smoking and ignition are not easily generated when the battery is broken. Thereby, the cycle characteristics are secured, and the safety when the battery is broken is improved.

First claim

What is claimed is:

1. A battery comprising:
a cathode;
an anode comprising an anode active material layer; and
an electrolyte;
wherein,
the anode active material layer comprises (i) a binder, the binder including an amount of a first resin not containing sulfur and an amount of a second resin containing sulfur (S), and (ii) a carbon material,
the anode active material layer has a thickness of 40 μm or less,
the amount of the second resin containing sulfur is 10 wt % or less of the anode active material, and
the amount of the second resin containing sulfur is greater that the amount of the first resin not containing sulfur.

2. The battery according to claim 1 , wherein the second resin containing sulfur has a sulfone bond (—SO 2 —) or a thioether bond (—S—).

3. The battery according to claim 1 , wherein the second resin containing sulfur has a structure shown in Chemical formula 1:

4. The battery according to claim 1 , wherein the second resin containing sulfur is at least one selected from the group consisting of polysulfone and polyether sulfone.

5. The battery according to claim 1 , wherein the second resin containing sulfur is a binder.

6. The battery according to claim 1 , wherein the first resin contains at least one selected from the group consisting of polyvinylidene fluoride and polyimide.

7. The battery according to claim 1 , wherein the first resin not containing sulfur has a structure selected from the group consisting of:

wherein R is selected from the group consisting of an ether bond (—O—), an ester bond (—O—CO—), a methylene group (—CH 2 —), a dimethyl methylene group (—C9CH 3 ) 2 —), and a carbonyl group (—CO—);

8. A battery comprising:
a cathode;
an anode comprising an anode active material layer; and
an electrolyte;
wherein,
the anode active material layer comprises (i) a binder, the binder including an amount of a first a resin and an amount of a second resin containing sulfur (S), and (ii) at least one material selected from the group consisting of a simple substance, an alloy, and a compound of silicon (Si) or tin (Sn),
the anode active material layer has a thickness of 30 μm or less,
a content of the second resin containing sulfur is 20 wt % or less of the anode active material, and
the amount of the second resin containing sulfur is greater that the amount of the first resin.

9. The battery according to claim 8 , wherein the second resin containing sulfur has a sulfone bond (—SO 2 —) or a thioether bond (—S—).

10. The battery according to claim 8 , wherein the second resin containing sulfur has a structure shown in Chemical formula 1:

11. The battery according to claim 8 , wherein the second resin containing sulfur is at least one selected from the group consisting of polysulfone and polyether sulfone.

12. The battery according to claim 8 , wherein the second resin containing sulfur is a binder.

13. The battery according to claim 8 , wherein the first resin not containing sulfur contains at least one selected from the group consisting of polyvinyl idene fluoride and polyimide.

14. The battery according to claim 8 , wherein the first resin not containing sulfur has a structure selected from the group consisting of:

wherein R is selected from the group consisting of an ether bond (—O—), an ester bond (—O—CO—), a methylene group (—CH 2 —), a dimethyl methylene group (—C(CH 3 ) 2 —), and a carbonyl group (—CO—);

15. The battery of claim 8 , wherein the anode active material layer comprises (i) a binder, the binder including an amount of a first a resin and an amount of a second resin containing S, and (ii) at least one compound of silicon (Si) or tin (Sn).

Assignees

• Kato Yoshikazu
• Kawase Kenichi
• Sony Corp

Inventors

• Kato Yoshikazu
• Kawase Kenichi

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/604

  containing aliphatic main chain polymers · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/622

  being polymers · CPC title

• H01M4/60 Primary

  of organic compounds · CPC title