Electrical Appliance

a technology of electrical appliances and electrodes, applied in the field of battery devices, can solve the problems of reducing the use efficiency of current, reducing the use efficiency of active materials, and poor electrolyte retention characteristics of natural graphite, so as to improve conductivity, reduce the volume of conduction auxiliary agents occupying the electrode, and improve the conductivity

Inactive Publication Date: 2012-02-23
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0018]The conductivity can be improved by using two-dimensional carbon including 1 to 100, preferably 1 to 10 graphenes as a conduction auxiliary agent. Note that in this specification, a graphene refers to a sheet of carbon molecules having sp2 bonds with a thickness of one atomic layer. FIG. 1 is a schematic view illustrating the case where such a conduction auxiliary agent extending two-dimensionally is used. Here, three sheets of two-dimensional carbon and a large number of active material particles form a complicated structur

Problems solved by technology

In addition, natural graphite has poor electrolyte retention characteristics.
These factors cause a problem of reduction in use efficiency of the active material.
Further, when graphite is used as a conduction auxiliary agent for a positive electrode of a battery, such as a lithium ion battery, in which charge and discharge are performed by transfer of alkali ions, there is a problem in that graphite particles absorb the alkal

Method used

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embodiment 1

[0049]In this embodiment, a method for manufacturing a lithium ion secondary battery which is one embodiment of the present invention will be described. First, two-dimensional carbon which is to be used as a conduction auxiliary agent is manufactured. As a method for manufacturing the two-dimensional carbon, a CVD method (Patent Document 2), a coating method (Patent Document 3), or a method in which two-dimensional carbon is chemically separated from graphite (Non-Patent Document 1) may be used.

[0050]For example, in the case where a CVD method is used, a metal film of nickel, iron, or the like serving as a catalyst is formed over a substrate, the substrate is placed in a chamber and heated at a temperature of 600° C. to 1100° C., and a gas containing hydrocarbon, such as methane or ethane, is introduced into the chamber, so that a two-dimensional carbon film including 1 to 10 graphene sheets is provided over the substrate.

[0051]Next, the metal film is etched with acid or the like, w...

embodiment 2

[0067]As examples of an electrical appliance according to the present invention, a variety of dry batteries, storage batteries, and the like are given. As a conduction auxiliary agent for a positive electrode or a negative electrode of any of these batteries, the conduction auxiliary agent including two-dimensional carbon described in Embodiment 1 may be used for example.

[0068]In addition, as examples of an electrical appliance according to the present invention, electric vehicles, electric power tools, personal computers, mobile phones, and the like can be given. Such an electrical appliance is not always supplied with power by a wire and therefore includes a storage battery inside. As a conduction auxiliary agent for a positive electrode or a negative electrode of the storage battery, the conduction auxiliary agent including two-dimensional carbon described in Embodiment 1 may be used for example.

[0069]In particular, a storage battery with low internal resistance is required for a...

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Abstract

An object is to increase the conductivity of an electrode including active material particles and the like, which is used for a battery. Two-dimensional carbon including 1 to 10 graphenes is used as a conduction auxiliary agent, instead of a conventionally used conduction auxiliary agent extending only one-dimensionally at most, such as graphite particles, acetylene black, or carbon fibers. A conduction auxiliary agent extending two-dimensionally has higher probability of being in contact with active material particles or other conduction auxiliary agents, so that the conductivity can be improved.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a variety of electrical appliances, particularly a battery, including a particulate material.[0003]2. Description of the Related Art[0004]In a manganese battery, an alkaline battery, a nickel-hydride battery, a lithium ion secondary battery, and the like, a particulate material is used as an active material for storing electricity. In some cases where the particulate material (active material particles) has low conductivity, a conduction auxiliary agent such as acetylene black, graphite particles, or carbon fibers is mixed into the material so as to increase the conductivity (see Patent Document 1).[0005]Specifically, the active material particles, the conduction auxiliary agent, and a binder are mixed, and the mixture is applied onto a current collector, molded, and then dried to be used as an electrode such as a positive electrode or a negative electrode.[0006]A procedure similar to th...

Claims

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Application Information

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IPC IPC(8): H01M4/60H01M4/583H01M4/62
CPCH01M4/366H01M4/60H01M4/625H01M4/1393H01M2004/021B29B15/00H01M4/661H01M4/0407Y02E60/10H01M4/02H01M50/491
Inventor TAKEMURA, YASUHIKOMORIWAKA, TAMAE
Owner SEMICON ENERGY LAB CO LTD
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