Carbon-coated active-material complex and lithium-ion battery

A technology of active material and electrode active material, applied in the direction of active material electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problem of low electronic conductivity and achieve the effect of internal resistance suppression

Active Publication Date: 2015-12-30
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, electrode active materials such as electrode materials containing lithium phosphate salt compounds having properties capable of reversibly intercalating and deintercalating lithium ions have a problem of low electron conductivity

Method used

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  • Carbon-coated active-material complex and lithium-ion battery
  • Carbon-coated active-material complex and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0140] (Production of carbon-coated active material complex (electrode material))

[0141] In 2L (liter) of water, mix 4 mol of lithium acetate (LiCH 3 COO), 2mol of iron (II) sulfate (FeSO 4 ), 2mol of phosphoric acid (H 3 PO 4 ) to prepare a homogeneous slurry mixture.

[0142] Next, this mixture was stored in a pressure-resistant airtight container with a capacity of 8 L, and hydrothermal synthesis was performed at 200° C. for 1 hour.

[0143] Thereafter, the obtained precipitate was washed with water to obtain precursor particles of an electrode active material in the form of a filter cake.

[0144] On the other hand, 150 g (in terms of solid content) of the precursor of the electrode active material, an aqueous polyvinyl alcohol solution obtained by dissolving 7.0 g of polyvinyl alcohol (PVA) as an organic compound in 100 g of water, and 100 g of polyvinyl alcohol as a pore forming agent Phosphoric acid (H 3 PO 4 )0.001mol, lithium acetate (LiCH 3 COO) 0.001 mol w...

Embodiment 2

[0173] Phosphoric acid (H 3 PO 4 )0.005mol, lithium acetate (LiCH 3 COO) 0.005 mol was used as a pore forming agent, and the carbon-coated active material complex and lithium ion battery of Example 2 were produced similarly to Example 1, and it evaluated.

[0174] Table 1 shows the evaluation results.

Embodiment 3

[0176] Phosphoric acid (H 3 PO 4 )0.0005mol, lithium acetate (LiCH 3 COO) 0.0005 mol was used as a pore forming agent, and the carbon-coated active material complex and lithium ion battery of Example 3 were produced similarly to Example 1, and it evaluated.

[0177] Table 1 shows the evaluation results.

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Abstract

This invention provides the following: a carbon-coated active-material complex that comprises an electrode active material with a carbonaceous coating formed on the surface thereof and, when used as an electrode material, improves not only electron conductivity but also lithium-ion conductivity; an electrode; and a lithium-ion battery. This carbon-coated active-material complex, in which lithium-ion charge transfer occurs at the interface between the carbonaceous coating and the electrode active material, is characterized in that: the activation energy required for lithium-ion insertion and extraction reactions to occur at the interface between the carbon-coated active material complex and an electrolyte is between 45 and 85 kJ / mol, inclusive; the ratio between the amount of carbon supported on particles of the electrode active material and the specific surface area of said particles is between 0.01 and 0.5, inclusive; and the values given for the aforementioned activation-energy range assume the use of an electrolyte solution comprising a 1:1 mixture of ethylene carbonate and diethyl carbonate.

Description

technical field [0001] The invention relates to a carbon-coated active material complex, an electrode and a lithium ion battery, in particular to a carbon-coated active material complex as a positive electrode material for a battery, and a carbon-coated active material more suitable for use in a positive electrode material for a lithium ion battery. A material complex, and a lithium ion battery including a positive electrode containing the carbon-coated active material complex. [0002] This application claims priority based on Japanese Patent Application No. 2013-104393 for which it applied to Japan on May 16, 2013, and uses the content for this specification. Background technique [0003] In recent years, non-aqueous electrolyte solution-based secondary batteries such as lithium ion batteries have been proposed and put into practical use as batteries expected to be reduced in size, weight and capacity. [0004] This lithium ion battery is composed of a positive electrode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/136H01M4/1397H01M4/366H01M4/5825H01M4/625H01M10/052H01M2004/021H01M2004/028Y02E60/10H01M4/133H01M4/587H01M10/0525H01M10/0569H01M2300/0037Y02T10/70
Inventor 峰裕之北川高郎
Owner SUMITOMO METAL MINING CO LTD
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