Supercharge Your Innovation With Domain-Expert AI Agents!

Graphite material, method for producing same, negative electrode for lithium ion secondary battery, negative electrode material for lithium ion secondary battery, and lithium ion secondary battery

A manufacturing method and a graphite-based technology, which can be used in secondary batteries, non-aqueous electrolyte battery electrodes, fuel cells, etc., and can solve the problems of inability to meet rapid charge-discharge performance, cycle performance, and insufficiency.

Active Publication Date: 2011-06-15
JFE CHEMICAL CORP
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of improving conductivity and reactivity only by increasing the degree of graphitization of graphite for negative electrodes is not sufficient like the above-mentioned prior art, and cannot meet the requirements for high-level rapid charge-discharge performance and cycle performance in recent years.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Graphite material, method for producing same, negative electrode for lithium ion secondary battery, negative electrode material for lithium ion secondary battery, and lithium ion secondary battery
  • Graphite material, method for producing same, negative electrode for lithium ion secondary battery, negative electrode material for lithium ion secondary battery, and lithium ion secondary battery
  • Graphite material, method for producing same, negative electrode for lithium ion secondary battery, negative electrode material for lithium ion secondary battery, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0152] (precursor of graphitic materials)

[0153] Mesophase spheres heat-treated with coal tar pitch (manufactured by JFE Chemical Co., Ltd., average particle size: 25 μm) were calcined at 600° C. for 3 hours in a nitrogen atmosphere to prepare spherical graphite material precursors. The average aspect ratio is 1.2.

[0154] The precursor of the graphitic material prepared by this method was used as the precursor (1).

[0155] (graphite material)

[0156] 100 parts by mass of the above-mentioned precursor (1) was added to 100 parts by mass of an aqueous ferric chloride solution (acidic) having a concentration corresponding to 5 mass % in terms of iron, and then an aqueous sodium hydroxide solution was added to neutralize to pH=7. In the obtained neutral solution, the precursor (1) is dispersed in a suspension of iron hydroxide (FeO(OH)). This dispersion liquid was heated to 100° C. to remove water, and then vacuum-dried at 150° C. for 5 hours to completely remove water.

...

Embodiment 2

[0198] Change the preparation method of the precursor of the graphitic material in embodiment 1. The small spheres of the mesophase were pulverized in advance to obtain lumpy particles with an average particle diameter of 15 μm. It was calcined at 600° C. for 3 hours under a nitrogen atmosphere to obtain a bulk precursor (2). Its average aspect ratio is 1.5.

[0199] Using the above-mentioned precursor (2), the graphitic material (2) was prepared by the same method and conditions as in Example 1. Graphite material (2) is a block with an average particle size of 14 μm, with 7 particles / 100 μm on the surface 2 The structure of hemispherical or spherical protrusions. The average height h of the protrusions was 2.8 μm, the average base length g was 2.3 μm, and the average h / g was 1.2. The average aspect ratio of the graphitic material (2) is 1.5, and the specific surface area is 4.5m 2 / g, interplanar spacing d 002 is 0.3356nm. Table 1 shows the properties of the precursor ...

Embodiment 3

[0207] Change the preparation method of the precursor of the graphitic material in embodiment 1. The coal tar pitch was calcined at 600 °C for 3 hours under nitrogen atmosphere to obtain the bulk mesophase. This was pulverized to prepare bulk and scale-like precursors (3) with an average particle diameter of 25 μm.

[0208] Next, 100 g of the precursor (3) was immersed in a mixture of 100 g of ethylene glycol and 0.5 g of hexamethylenetetramine together with 5 g of phenolic resin (residual rate after graphitization: 40%) as a carbon source material. middle. While stirring the obtained mixture, ethylene glycol was removed under reduced pressure (1.3 Pa) at 150° C. to obtain a resin-coated precursor. The resin-coated precursor was heat-treated in air at 270° C. for 5 hours to cure the resin to obtain a precursor (31) covered with the cured resin. Its average aspect ratio is 2.8.

[0209] In addition, when this precursor (31) was observed with a polarizing microscope, it was ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
heightaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

Disclosed is a graphite material wherein protrusions having a height of not less than 1 mum are sprinkled. This graphite material is suitable for negative electrodes and negative electrode materials for lithium ion secondary batteries. By using such a negative electrode, there can be obtained a lithium ion secondary battery having high discharge capacity, high initial charge / discharge efficiency, excellent high-rate charge / discharge characteristics and excellent cycle characteristics. Also disclosed is a method for simply producing such a graphite material at low cost.

Description

technical field [0001] The present invention relates to a graphite material and a manufacturing method thereof, a negative electrode material for a lithium ion secondary battery containing the graphite material, a negative electrode containing the negative electrode material, and a lithium ion secondary battery using the negative electrode. Background technique [0002] In recent years, along with miniaturization and higher performance of electronic equipment, there has been an increasing demand for an increase in the energy density of batteries. Lithium-ion secondary batteries, in particular, are attracting attention because they can achieve higher voltage and higher energy density than other secondary batteries. Lithium-ion secondary batteries have a negative electrode, a positive electrode, and a non-aqueous electrolyte as the main components. During the discharge process and the charge process, lithium ions generated from the non-aqueous electrolyte move between the neg...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587H01M10/36H01M10/0525C01B31/04H01M4/58H01M4/02H01M4/133H01M4/1393H01M4/583H01M10/05
CPCY02E60/122C01B31/04Y02E60/50H01M4/587H01M8/0213H01M10/0525C01B32/20C01B32/205Y02E60/10Y02P70/50H01M4/13H01M4/583
Inventor 江口邦彦井尻真树子长山胜博羽多野仁美
Owner JFE CHEMICAL CORP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com