Composition, electrode and secondary battery

Patent metadata

Field	Value
Publication number	US-2024372105-A1
Application number	US-202418774178-A
Country	US
Kind code	A1
Filing date	Jul 16, 2024
Priority date	Jan 17, 2022
Publication date	Nov 7, 2024
Grant date	—

Abstract

Provided is a composition, comprising single-walled carbon nanotube, a binder, and a specific solvent, wherein the binder contains a fluorine-containing polymer containing a vinylidene fluoride unit.

First claim

1 . A composition, comprising: a single-walled carbon nanotube; a binder; and a solvent represented by a general formula (1), wherein the binder contains a fluorine-containing polymer containing vinylidene fluoride unit,

wherein R 1 , R 2 , and R 3 are each independently H or a monovalent substituent, provided that the total number of carbon atoms of R 1 , R 2 , and R 3 is 6 or more, and at least one of R 1 , R 2 , and R 3 is an organic group having a carbonyl group; and any two of R 1 , R 2 , and R 3 optionally bond to each other to form a ring.

2 . The composition according to claim 1 , wherein the solvent is a solvent represented by a general formula (1a):

wherein R 1a is a monovalent substituent, R 2a and R 3a are each independently H or a monovalent substituent, provided that the total number of carbon atoms of R 1a , R 2a , and R 3a is 5 or more; and any two of R 1a , R 2a , and R 3a optionally bond to each other to form a ring.

3 . The composition according to claim 1 , wherein the solvent is at least one selected from the group consisting of a solvent represented by a general formula (1b-1) and a solvent represented by a general formula (1b-2):

wherein R 1b is an alkyl group, an alkoxyalkyl group, an acylalkyl group, an alkenyl group, an amino group, or an aminoalkyl group, R 2b and R 3b are each independently an alkyl group or an alkoxyalkyl group, the total number of carbon atoms of R 1b , R 2b , and R 3b is 5 or more, R 2b and R 3b optionally bond to each other to form a ring with a nitrogen atom to which R 2b and R 3b bond, and an oxygen atom is optionally contained as a ring-constituting atom.

wherein a ring A is a 5-membered or 6-membered amide ring, R 4b is an alkyl group, a cycloalkyl group, or an alkenyl group, and the total number of carbon atoms of the ring A and R 4b is 5 or more.

4 . The composition according to claim 1 , wherein the solvent is at least one selected from the group consisting of 3-methoxy-N,N-dimethylpropanamide, N-ethyl-2-pyrrolidone, and N-butyl-2-pyrrolidone.

5 . The composition according to claim 1 , wherein an average outer diameter of the single-walled carbon nanotube is 2.5 nm or less.

6 . The composition according to claim 1 , wherein an average G/D ratio of the single-walled carbon nanotube is 2 or more.

7 . The composition according to claim 1 , wherein the binder contains a polyvinylidene fluoride as the fluorine-containing polymer.

8 . The composition according to claim 1 , wherein the binder contains a fluorine-containing copolymer containing vinylidene fluoride unit and a unit of an other monomer other than vinylidene fluoride as the fluorine-containing polymer.

9 . The composition according to claim 8 , wherein the other monomer is a fluorinated monomer, excluding vinylidene fluoride.

10 . The composition according to claim 8 , wherein the other monomer is at least one selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene, (meth)acrylic acid, 2,3,3,3-tetrafluoropropene, hexafluoropropylene, and a fluoroalkyl vinyl ether.

11 . The composition according to claim 8 , wherein the binder contains a polyvinylidene fluoride and a fluorine-containing copolymer containing vinylidene fluoride unit and a unit of an other monomer other than vinylidene fluoride, as the fluorine-containing polymer.

12 . The composition according to claim 11 , wherein a mass ratio of the polyvinylidene fluoride to the fluorine-containing copolymer, polyvinylidene fluoride/fluorine-containing polymer, is 99/1 to 1/99.

13 . The composition according to claim 1 , wherein the composition is used to form an electrode of an electrochemical device.

14 . The composition according to claim 1 , further comprising a powder electrode material, excluding the single-walled carbon nanotube.

15 . The composition according to claim 14 , wherein the powder electrode material comprises a lithium composite oxide as a positive electrode active material.

16 . The composition according to claim 14 , wherein the powder electrode material comprises a negative electrode active material that exhibits a potential of 2.5 V or less vs. Li when alloyed with Li or bonded with Li.

17 . An electrode comprising: a current collector; and an electrode material layer provided on one side or each of both sides of the current collector and formed from the composition according to claim 1 .

18 . A secondary battery comprising the electrode according to claim 17 .

Assignees

• Daikin Ind Ltd
• Mcd Tech S A R L

Inventors

• Hosoda Chihiro
• Yamazaki Shigeaki
• Terada Junpei
• Shimooka Toshiharu
• Ichinose Yuma
• Nishiyama Yumi
• Predtechenskiy Mikhail Rudolfovich
• Bobrenok Oleg Filippovich

Classifications

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/623 Primary

  fluorinated polymers · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title