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Synthetic graphite material, synthetic graphite material production method, negative electrode for lithium ion secondary battery, and lithium ion secondary battery

A technology of artificial graphite and manufacturing method, which is applied in the direction of secondary battery, battery electrode, negative electrode, etc., and can solve the problems of capacity degradation, poor charge and discharge efficiency of positive electrode and negative electrode, etc.

Active Publication Date: 2021-09-07
JXTJ NIPPON OIL & ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] As has been reported, in the state where lithium metal is not precipitated on the negative electrode, the capacity deterioration progresses due to the difference in charge and discharge efficiency between the positive electrode and the negative electrode (for example, refer to Non-Patent Document 1)

Method used

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  • Synthetic graphite material, synthetic graphite material production method, negative electrode for lithium ion secondary battery, and lithium ion secondary battery
  • Synthetic graphite material, synthetic graphite material production method, negative electrode for lithium ion secondary battery, and lithium ion secondary battery
  • Synthetic graphite material, synthetic graphite material production method, negative electrode for lithium ion secondary battery, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0165] Atmospheric distillation residue with a sulfur content of 3.1% by mass was subjected to hydrodesulfurization in the presence of a catalyst so that the hydrocracking rate was 25% or less to obtain a hydrodesulfurized oil (A). The hydrodesulfurization conditions were set at a total pressure of 18 MPa, a hydrogen partial pressure of 16 MPa, and a temperature of 380°C.

[0166] In addition, under the conditions of reaction temperature 530°C, total pressure 0.23MPa, catalyst / oil ratio 13, and contact time 7 seconds, the material obtained by vacuum distillation and hydrodesulfurization of atmospheric distillation residue (sulfur component 380 mass The density at ppm and 15°C is 0.83g / cm 3 ) for fluid catalytic cracking to obtain fluid catalytic cracking residue (A). As the catalyst, a catalyst in which platinum was supported on a silica-alumina catalyst was used.

[0167] In addition, under the conditions of the heating furnace outlet temperature of 350°C and the pressure o...

Embodiment 2

[0203] After adding and mixing the same volume of n-heptane to the fluid catalytic cracking residue (A) obtained in Example 1, selective extraction was performed with dimethylformamide to separate aromatic components and saturated components. The saturated components therein were used as the stock oil composition of Example 2. The n-paraffin content and the aromatic index fa in the stock oil composition of Example 2 were determined by the same method as in Example 1. The results are shown in Table 1.

[0204] The raw material oil composition of Example 2 was subjected to coking treatment in the same manner as in Example 1 to obtain a raw coke composition.

[0205] The obtained raw coke composition was pulverized by a hammer mill so that the average particle diameter measured by a laser diffraction particle size distribution measuring device became 30.2 μm, thereby obtaining a raw coke powder.

[0206] The volume-based surface area of ​​the raw material coke powder (raw mater...

Embodiment 3

[0212] The hydrodesulfurized oil (A) obtained in Example 1 and the aromatic components of the fluidized catalytic cracking residue (A) obtained in Example 2 were mixed in a mass ratio of 45:55, used as The stock oil composition of embodiment 3.

[0213] The n-paraffin content and aromatic index fa in the stock oil composition of Example 3 were determined in the same manner as in Example 1. The results are shown in Table 1.

[0214] In the same manner as in Example 1, the raw material oil composition of Example 3 was subjected to a coking treatment to obtain a raw coke composition.

[0215] The obtained raw coke composition was pulverized with a hammer mill so that the average particle diameter measured by a laser diffraction particle size distribution measuring device was 21.4 μm, thereby obtaining a raw coke powder.

[0216] The volume-based surface area of ​​the raw material coke powder (raw material volume-based surface area) was obtained in the same manner as in Example ...

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Abstract

A synthetic graphite material wherein the crystal grain size L(112) in the c-axis direction as calculated from a (112) diffraction line obtained by wide-angle X-ray diffraction is 4-30nm, the surface area based on volume as calculated by a laser diffraction-type particle size distribution measurement device is 0.22-1.70m2 / cm3, the oil absorption is 67-147mL / 100g, and the nitrogen adsorption specific surface area is 3.1-8.2m2 / g.

Description

technical field [0001] The invention relates to an artificial graphite material, a manufacturing method of the artificial graphite material, a negative electrode for a lithium-ion secondary battery, and a lithium-ion secondary battery. [0002] This application claims priority based on Japanese Patent Application No. 2019-004662 for which it applied in Japan on January 15, 2019, and uses the content here. Background technique [0003] Lithium-ion secondary batteries are used in industrial applications such as automobiles and power storage for system infrastructure. [0004] Graphite, such as an artificial graphite material, is used as a negative electrode material of a lithium ion secondary battery (for example, refer patent document 1.). [0005] Batteries suitable for automotive use are used in a wide temperature range from low temperatures below 0°C to high temperatures above 60°C. However, in a lithium ion secondary battery using graphite as a negative electrode materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205H01M4/587
CPCC01B32/205H01M4/587Y02E60/10C01P2006/19C01P2006/12C01P2002/60H01M10/0525C01P2002/70C01P2006/40H01M2004/021H01M2004/027
Inventor 铃木贵志前田崇志唐金光雄白井崇弘川地浩史木内规之
Owner JXTJ NIPPON OIL & ENERGY CORP
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