Electrode material and method for producing the same

a technology of electrodes and materials, applied in the field of electrode materials, can solve the problems of low conductivity, reduce internal resistance, uneven conductivity, etc., and achieve the effects of uneven conductivity, uneven conductivity, and uneven conductivity

Inactive Publication Date: 2013-10-03
SUMITOMO OSAKA CEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0030]According to the electrode material of the invention, the average particle size of the aggregate formed by aggregating electrode-active material particles having a carbonaceous film formed on a surface thereof is set to 0.5 to 100 μm, and a volume density of the aggregate is set to 50 to 80 vol % of the volume density in a case in which the aggregate is a solid, and thus unevenness in a supporting amount of the carbonaceous film formed on the surface of the electrode-active material particles may be reduced, and as a result, unevenness in conductivity of the electrode-active material may be reduced. Accordingly, when the electrode-active material is used as an electrode material of a lithium ion battery, internal resistance may be reduced.
[0031]When the electrode-active material in which the unevenness in conductivity is reduced is used as the electrode material of the lithium ion battery, a reaction related to intercalation and deintercalation of lithium ions may be uniformly carried out in the entirety of the surface of the electrode-active material, and thus the internal resistance may be reduced.
[0032]In addition, the internal resistance mentioned here represents internal resistance at a site at which reaction resistance related to intercalation and deintercalation of lithium ions is high in a particle, which does not have the carbonaceous film formed on a surface thereof or in which the thickness of the carbonaceous film is small, of the electrode-active material. Specifically, when the electrode-active material is used as an electrode-active material of the lithium ion battery, the internal resistance is shown as a magnitude of voltage drop at the final stage of discharge. That is, in an electrode-active material in which the intercalation and deintercalation reaction of lithium ions is uniformly carried out over the entirety of the surface of the electrode-active material, the voltage drop at the final stage of discharge is small. Conversely, in an electrode-active material in which the intercalation and deintercalation reaction resistance of lithium ions is high at a part of the surface of the elec

Problems solved by technology

However, the electrode material, which contains an electrode-active material, for example, the Li-containing metal oxide havi

Method used

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first embodiment

[0039]An embodiment (first embodiment) of an electrode material and a method for producing the same of the invention will be described.

[0040]In addition, this embodiment makes a description in detail for easy comprehension of the gist of the invention, and does not limit the invention unless otherwise stated.

[0041][Electrode Material]

[0042]An electrode material of this embodiment includes an aggregate formed by aggregating electrode-active material particles having a carbonaceous film formed on a surface, an average particle size of the aggregate is 0.5 to 100 μm, and a volume density of the aggregate is 50 to 80 vol % of the volume density in a case in which the aggregate is a solid.

[0043]Here, it is assumed that a solid aggregate is an aggregate in which a void is not present at all, and a density of an actual aggregate is the same as a theoretical density of an electrode-active material.

[0044]Here, the aggregate that is formed by aggregating each electrode-active material having ...

example 1

[0099](Preparation of Electrode Material)

[0100]4 mol lithium acetate (LiCH3COO), 2 mol iron (II) sulfate (FeSO4), and 2 mol phosphoric acid (H3PO4) were mixed to 2 L (liters) of water so that the entire amount became 4 L, whereby a uniform slurry mixture was prepared.

[0101]Then, this mixture was accommodated in an 8-L pressure-resistant airtight container, and hydrothermal synthesis was performed at 120° C. for one hour.

[0102]Then, a precipitate that was obtained was washed with water, whereby a cake-shaped precursor of the electrode-active material was obtained.

[0103]Then, 150 g (in terms of a solid content) of the precursor of the electrode-active material, an aqueous polyvinyl alcohol solution, which was obtained dissolving 20 g of polyvinyl alcohol in 200 g of water, as the organic compound, and 500 g of zirconia balls having a diameter of 5 mm as a medium particle were put into a ball mill, and a dispersion treatment was carried out after adjusting a stirring time of the ball m...

example 2

[0135]An electrode material, and a positive electrode of the lithium ion battery were prepared in the same manner as Example 1 except that the stirring time of the ball mill was adjusted so that D90 / D10 of the particle size distribution of the precursor particle of the electrode-active material in the slurry became 10. Then, evaluation was performed. Evaluation results are shown in Table 1.

[0136]In addition, in Example 2, the same voltage drop at the final stage of discharge as Example 1 was also recognized.

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Abstract

The present invention provides an electrode material in which unevenness in a supporting amount of a carbonaceous film is less when using an electrode-active material having a carbonaceous film on a surface thereof as the electrode material, and which is capable of improving conductivity, and a method for producing the electrode material. The electrode material includes an aggregate formed by aggregating an electrode-active material in which a carbonaceous film is formed on a surface. In the electrode material, an average particle size of the aggregate is 0.5 to 100 μm, a volume density of the aggregate is 50 to 80 vol % of a volume density in a case in which the aggregate is a solid, and 80% or more of the surface of the electrode-active material is covered with the carbonaceous film. Alternatively, the electrode material includes an aggregate formed by aggregating electrode-active material particles in which a carbonaceous film is formed on a surface. In the electrode material, an average particle size of the aggregate is 0.5 to 100 μm, a pore size (D50) when an accumulated volume percentage of a pore size distribution of the aggregate is 50% is 0.1 to 0.2 μm, and porosity of the aggregate is 15 to 50 vol % with respect to a volume in a case in which the aggregate is a solid.

Description

TECHNICAL FIELD [0001]The present invention relates to an electrode material and a method for producing the same, and more particularly, to an electrode material suitable for use in a positive electrode material for a battery, in particular, a positive electrode material for a lithium ion battery, and to a method for producing the electrode material.[0002]Priority is claimed on Japanese Patent Application No. 2010-282353, filed Dec. 17, 2010, and Japanese Patent Application No. 2011-207833, filed Sep. 22, 2011, the contents of which are incorporated herein by reference.[0003](Incorporation)BACKGROUND ART [0004]In recent years, as a battery that meets the expectations for miniaturization, lightness, and high capacity, a non-aqueous electrolyte-based secondary battery such as a lithium ion battery has been suggested, and has been put into practical use.[0005]The lithium ion battery includes positive electrode and negative electrode that have properties capable of reversibly intercalat...

Claims

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Application Information

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IPC IPC(8): H01M4/133
CPCH01M4/625H01M2004/021H01M4/133Y02E60/122H01M4/5825H01M4/485H01M4/505H01M4/525H01M4/366C01B31/02C01B32/05Y02E60/10H01M4/139H01M4/36H01M4/583H01M4/62H01M10/0525H01M4/131Y02P70/50
Inventor KITAGAWA, TAKAOYASUMIISHI, HIROFUMIUEHARA, MASARU
Owner SUMITOMO OSAKA CEMENT CO LTD
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