Power storage device electrode, power storage device, and method of producing power storage device electrode

Patent metadata

Field	Value
Publication number	US-11201330-B2
Application number	US-201916584802-A
Country	US
Kind code	B2
Filing date	Sep 26, 2019
Priority date	Sep 27, 2018
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

A power storage device electrode includes a layered structure having an organic framework layer containing aromatic dicarboxylic acid anions and an alkali metal element layer in which alkali metal elements are coordinated to oxygen atoms contained in the carboxylic acid anion to form a framework as an electrode active material, and in the whole of the electrode active material, a conductive material and a water-soluble polymer, carboxymethyl cellulose as the water-soluble polymer is contained in a range of 1.5 mass % or more and 3.5 mass % or less. In addition, the layered structure is produced by a spray drying method, and the peak intensity ratio when the power storage device electrode is subjected to X-ray diffraction measurement satisfies a predetermined range.

First claim

What is claimed is:

1. A power storage device electrode comprising:
a layered structure, as an electrode active material, having an organic framework layer containing an aromatic dicarboxylic acid anion and an alkali metal element layer in which alkali metal elements are coordinated to oxygen atoms contained in a carboxylic acid anion of the aromatic dicarboxylic acid anion to form a framework,
wherein, in the whole of the electrode active material, a conductive material, and a water-soluble polymer containing at least carboxymethyl cellulose, the carboxymethyl cellulose is contained in a range of 1.5 mass % or more and 3.5 mass % or less, and at least one of following conditions (1) to (5) is satisfied:

(1) a peak intensity ratio P(300)/P(111) of a peak intensity of (300) with respect to a peak intensity of (111) when the power storage device electrode is subjected to X-ray diffraction measurement is 2.0 or more,
(2) a peak intensity ratio P(300)/P(011) of the peak intensity of (300) with respect to a peak intensity of (011) in the X-ray diffraction measurement is 2.0 or more,
(3) a peak intensity ratio P(100)/P(111) of a peak intensity of (100) with respect to the peak intensity of (111) in the X-ray diffraction measurement is 6.0 or more,
(4) a peak intensity ratio P(100)/P(011) of the peak intensity of (100) with respect to the peak intensity of (011) in the X-ray diffraction measurement is 5.0 or more, and
(5) a peak intensity ratio P(100)/P(300) of the peak intensity of (100) with respect to the peak intensity of (300) in the X-ray diffraction measurement is 1.5 or more.

2. The power storage device electrode according to claim 1 , wherein
the power storage device electrode contains the carboxymethyl cellulose in a range of 1.8 mass % or more and 2.5 mass % or less.

3. The power storage device electrode according to claim 1 , wherein
the water-soluble polymer contains polyethylene oxide.

4. The power storage device electrode according to claim 3 , wherein
the power storage device electrode contains the polyethylene oxide as the water-soluble polymer in a range of 6 mass % or more and 9 mass % or less.

5. The power storage device electrode according to claim 1 , wherein the power storage device electrode has the layered structure including a structure represented by at least one of Expressions (1) to (3):

wherein, a is an integer of 2 or more and 5 or less, b is an integer of 0 or more and 3 or less, and each of aromatic compounds represented by Expressions (1) to (3) may have a substituent and a hetero atom in each of the structures, and A is an alkali metal.

6. A power storage device comprising:
a negative electrode which is the power storage device electrode according to claim 1 ;
a positive electrode containing a positive electrode active material; and
an ionic conductive medium which is interposed between the positive electrode and the negative electrode to conduct ions.

7. The power storage device according to claim 6 , wherein
the positive electrode contains at least one of a transition metal complex oxide containing lithium and an activated carbon with a specific surface area of 1,000 m 2 /g or more as the positive electrode active material.

8. A method of producing a power storage device electrode, comprising:
spray drying a preparation solution in which aromatic dicarboxylic acid anions and alkali metal cations are dissolved using a spray drying device and thus precipitating a layered structure having an organic framework layer containing the aromatic dicarboxylic acid anions and an alkali metal element layer in which alkali metal elements are coordinated to oxygen atoms contained in a carboxylic acid anion of the organic framework layer to form a framework;
using the layered structure as an electrode active material and obtaining an electrode composite material by mixing carboxymethyl cellulose in a range of 1.5 mass % or more and 3.5 mass % or less with respect to the electrode composite material containing the electrode active material, a conductive material, and a water-soluble polymer containing at least the carboxymethyl cellulose; and
applying the electrode composite material on a current collector such that an electrode composite material layer is formed.

9. The method according to claim 8 , wherein
the carboxymethyl cellulose is added in a range of 1.8 mass % or more and 2.5 mass % or less with respect to the electrode composite material.

10. The method according to claim 8 , wherein
polyethylene oxide as the water-soluble polymer is added to the electrode composite material.

11. The method according to claim 10 , wherein
the polyethylene oxide is added in a range of 6 mass % or more and 9 mass % or less with respect to the electrode composite material.

12. The method according to claim 8 , wherein
the layered structure including a structure represented by at least one of Expressions (1) to (3) is precipitated:

wherein, a is an integer of 2 or more and 5 or less, b is an integer of 0 or more and 3 or less, and each of aromatic compounds represented by Expressions (1) to (3) may have a substituent and a hetero atom in each of the structures, and A is an alkali metal.

Assignees

• Toyota Motor Co Ltd

Inventors

• Ogihara Nobuhiro
• Hiruta Osamu
• Ueno Yukiyoshi

Classifications

• H01M4/60 Primary

  of organic compounds · CPC title

• H01M4/137 Primary

  Electrodes based on electro-active polymers · CPC title

• H01M4/366

  as layered products · CPC title

• H01M4/622

  being polymers · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title