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

Patent metadata

Field	Value
Publication number	US-11165066-B2
Application number	US-201514722795-A
Country	US
Kind code	B2
Filing date	May 27, 2015
Priority date	May 29, 2014
Publication date	Nov 2, 2021
Grant date	Nov 2, 2021

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. An electrode comprising:
an active material layer comprising:
an active material particle;
a graphene; and
a partly dehydrofluorinated poly(vinylidene fluoride) sandwiched by a poly(vinylidene fluoride); and

a current collector comprising:
a metal layer; and
a layer substantially formed of carbon particles,

wherein the layer substantially formed of carbon particles does not comprise a polymer,
wherein the partly dehydrofluorinated poly(vinylidene fluoride) comprises at least one of a polyene structure and an aromatic ring structure,
wherein in the partly dehydrofluorinated poly(vinylidene fluoride) a combined carbon atomic ratio of the aromatic ring structures and the polyene structures is less than 5% of a carbon atomic ratio of poly(vinylidene fluoride) structures, and
wherein the active material layer comprises a first region and a second region, and wherein a fluorine concentration in the first region is different from a fluorine concentration in the second region when measured by time-of-flight secondary ion mass spectrometry (ToF-SIMS).

2. The electrode according to claim 1 ,
wherein the polyene structure or the aromatic ring structure is located in a main chain of the partly dehydrofluorinated poly(vinylidene fluoride).

3. The electrode according to claim 1 , wherein the active material particle comprises lithium.

4. A storage battery comprising:
the electrode according to claim 1 ; and
an electrolyte.

5. An electric device comprising:
the storage battery according to claim 4 ; and
a housing, a display device, or a switch.

6. The electrode according to claim 1 , wherein the layer substantially formed of carbon particles covers the metal layer.

Assignees

• Semiconductor Energy Lab

Inventors

• Ikenuma Tatsuya

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title

• H01M4/13

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