Method for forming electrode, electrode, storage battery, and electric device

Patent metadata

Field	Value
Publication number	US-11735738-B2
Application number	US-202117511108-A
Country	US
Kind code	B2
Filing date	Oct 26, 2021
Priority date	May 29, 2014
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

An electrode improved for achieving a storage battery having both a high electrode strength and favorable electrode conductivity is provided. The electrode includes graphene and a modified polymer in an active material layer or includes a layer substantially formed of carbon particles and an active material layer including a modified polymer over a current collector. The modified polymer has a poly(vinylidene fluoride) structure and partly has a polyene structure or an aromatic ring structure. The polyene structure or the aromatic ring structure is sandwiched between poly(vinylidene fluoride) structures.

First claim

What is claimed is:

1. A method for forming an electrode comprising:
forming a mixture comprising an active material particle, graphene oxide, and a poly(vinylidene fluoride);
providing the mixture over a current collector; and
dehydrofluorinating the poly(vinylidene fluoride) by treating the mixture in a solution comprising a polar solvent and a reducing agent.

2. The method for forming an electrode according to claim 1 , wherein the polar solvent comprises at least one of water, methanol, ethanol, acetone, tetrahydrofuran, dimethylformamide, 1-methyl-2-pyrrolidone and dimethyl sulfoxide.

3. The method for forming an electrode according to claim 1 , wherein the reducing agent is a material having a LUMO level of higher than or equal to −5.0 eV and lower than or equal to −3.8 eV.

4. The method for forming an electrode according to claim 1 , wherein the reducing agent comprises at least one of ascorbic acid, hydrazine, dimethyl hydrazine, hydroquinone, tetra-butyl ammonium bromide, NaBH 4 and N,N-diethylhydroxylamine.

5. The method for forming an electrode according to claim 1 ,
wherein a polyene structure or an aromatic ring structure is formed in the poly(vinylidene fluoride) by the dehydrofluorination.

6. A method for forming an electrode comprising:
forming a layer over a metal layer, the layer comprising a carbon particle;
forming a mixture comprising an active material particle and a poly(vinylidene fluoride);
providing the mixture over the layer; and

dehydrofluorinating the poly(vinylidene fluoride) by treating the mixture in a solution comprising a polar solvent and a reducing agent.

7. The method for forming an electrode according to claim 6 , wherein the polar solvent comprises at least one of water, methanol, ethanol, acetone, tetrahydrofuran, dimethylformamide, 1-methyl-2-pyrrolidone and dimethyl sulfoxide.

8. The method for forming an electrode according to claim 6 , wherein the reducing agent is a material having a LUMO level of higher than or equal to −5.0 eV and lower than or equal to −3.8 eV.

9. The method for forming an electrode according to claim 6 , wherein the reducing agent comprises at least one of ascorbic acid, hydrazine, dimethyl hydrazine, hydroquinone, tetra-butyl ammonium bromide, NaBH 4 and N,N-diethylhydroxylamine.

10. The method for forming an electrode according to claim 6 ,
wherein a polyene structure or an aromatic ring structure is formed in the poly(vinylidene fluoride) by the dehydrofluorination.

Assignees

• Semiconductor Energy Lab

Inventors

• Ikenuma Tatsuya

Classifications

• H01M4/623 Primary

  fluorinated polymers · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/049

  Manufacturing of an active layer by chemical means · CPC title

• H01M4/13

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

• H01M4/139

  Processes of manufacture · CPC title