Electrode, power storage device, and electronic device

Patent metadata

Field	Value
Publication number	US-10230095-B2
Application number	US-201615156524-A
Country	US
Kind code	B2
Filing date	May 17, 2016
Priority date	May 19, 2015
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

To provide a power storage device with a high capacity. To provide a power storage device with a high energy density. To provide a highly reliable power storage device. To provide a long-life power storage device. To provide an electrode with a high capacity. To provide an electrode with a high energy density. To provide a highly reliable electrode. To provide a long-life electrode. The power storage device includes a first electrode and a second electrode. The first electrode includes a first current collector and a first active material layer. The first active material layer includes a first active material and a first binder. The first active material is graphite. A separation strength F of the first electrode that is measured when the first active material layer is separated from the first current collector after the first electrode is immersed in a solution at a temperature higher than or equal to 20° C. and lower than or equal to 70° C. for longer than or equal to three hours is higher than or equal to 0.05 N/cm and lower than or equal to 5 N/cm per unit width of a sample that is separated.

First claim

What is claimed is:

1. An electrode comprising:
an active material and a first layer,
wherein the first layer contains carbon and oxygen,
wherein the first layer contains unsaturated bonds,
wherein the first layer includes a first region and a second region,
wherein the second region is located on the active material,
wherein the first region is located on the second region, and
wherein a concentration of the unsaturated bonds contained in the second region is lower than a concentration of the unsaturated bonds contained in the first region.

2. The electrode according to claim 1 ,
wherein the unsaturated bonds and osmium tetroxide are reacted with each other so that osmium is added to the first layer.

3. The electrode according to claim 1 ,
wherein a value obtained by dividing an amount by mole of the unsaturated bonds contained in the first layer by a sum of the number of carbon atoms and oxygen atoms is larger in the first region than in the second region.

4. The electrode according to claim 1 ,
wherein a value obtained by dividing an amount by mole of the unsaturated bonds contained in the first layer by a sum of the number of carbon atoms and oxygen atoms in the first region is twice or more and 100 times or less as large as that in the second region.

5. The electrode according to claim 1 ,
wherein the first layer has a thickness larger than or equal to 1 nm and smaller than or equal to 150 nm.

6. The electrode according to claim 1 ,
wherein the first region and the second region each have a shape of a layer.

7. The electrode according to claim 1 ,
wherein the first layer includes a second material; and
wherein the second material is at least one of carboxymethyl cellulose, methyl cellulose, ethyl cellulose, hydroxypropyl cellulose, and diacetyl cellulose.

8. An electronic device comprising a power storage device comprising the electrode described in claim 1 .

9. An electrode comprising:
an active material and a first layer,
wherein the first layer includes a first region and a second region,
wherein the first layer includes a first material,
wherein the first material is a diene-based polymer,
wherein the second region is located on the active material,
wherein the first region is located on the second region, and
wherein a concentration of the first material included in the second region is lower than a concentration of the first material included in the first region.

10. The electrode according to claim 9 ,
wherein a value obtained by dividing an amount by mole of unsaturated bonds contained in the first layer by a sum of the number of carbon atoms and oxygen atoms is larger in the first region than in the second region.

11. The electrode according to claim 9 ,
wherein a value obtained by dividing an amount by mole of unsaturated bonds contained in the first layer by a sum of the number of carbon atoms and oxygen atoms in the first region is twice or more and 100 times or less as large as that in the second region.

12. The electrode according to claim 9 ,
wherein the first layer has a thickness larger than or equal to 1 nm and smaller than or equal to 150 nm.

13. The electrode according to claim 9 ,
wherein the first region and the second region each have a shape of a layer.

14. The electrode according to claim 9 ,
wherein the first layer includes a second material; and
wherein the second material is at least one of carboxymethyl cellulose, methyl cellulose, ethyl cellulose, hydroxypropyl cellulose, and diacetyl cellulose.

15. An electronic device comprising a power storage device comprising the electrode described in claim 9 .

Assignees

• Semiconductor Energy Lab

Inventors

• Kimura Kai
• Ikenuma Tatsuya
• Inoue Nobuhiro
• Oguni Teppei

Classifications

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M10/0525

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