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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, applied in the direction of secondary battery, battery electrode, graphite, etc., can solve the problems of capacity deterioration, poor charging and discharging efficiency of positive electrode and negative electrode, etc., and achieve the effect that the discharge capacity is difficult to deteriorate

Pending Publication Date: 2021-08-24
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 at the negative electrode, the capacity deterioration progresses due to the difference in charge-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

[0185] Desulfurized vacuum light oil (sulfur content 500 mass ppm, density at 15°C: 0.88 g / cm 3 ) was subjected to fluid catalytic cracking to obtain a fluid catalytic cracking residue (hereinafter referred to as "fluid catalytic cracking residue (A)"). The obtained fluid catalytic cracking residue (A) had an initial boiling point of 200°C, a sulfur content of 0.2% by mass, a nitrogen content of 0.1% by mass, and an aromatic content of 65% by mass.

[0186] Next, desulfurized vacuum light oil (sulfur content 500 mass ppm, density at 15°C: 0.88 g / cm 3 ) was subjected to fluid catalytic cracking to obtain light cycle oil (hereinafter referred to as "fluid catalytic cracked light oil (A)"). The obtained fluid catalytic cracking light oil (A) had an initial boiling point of 180° C., an end boiling point of 350° C., an asphaltenes content of 0% by mass, a saturated content of 47% by mass, and an aromatic content of 53% by volume.

[0187]In addition, hydrodesulfurization of atmos...

Embodiment 2

[0217] Decomposed light oil (sulfur content 0.2% by mass, density at 15°C 0.92 g / cm3) obtained in the delayed coking process as light oil 3 , saturated components 36% by volume, aromatic components 64% by volume, asphaltene components 0% by mass, initial boiling point 220°C, final boiling point 340°C (hereinafter referred to as "coking cracked light oil (A)) and heavy oil Fluid catalytic cracking residue (A) and fluid catalytic cracking residue (B) are mixed in a ratio of 30:50:20 in mass ratio to obtain the stock oil composition of Example 2. The stock oil of Example 2 Table 1 shows the content of light oil in the composition.

[0218] 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.

[0219] 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 analyzer became 18.2 μ...

Embodiment 3

[0226] The light oil obtained by the light oil desulfurization device, that is, the desulfurized light oil (density at 15°C is 0.90g / cm 3 , aromatic component 25% by volume, asphaltene component 0% by mass, initial boiling point 180°C, final boiling point 350°C (hereinafter referred to as "desulfurized light oil (A)) and fluid catalytic cracking residue ( A) and fluid catalytic cracking residue (B) are mixed in a ratio of 15:40:45 in mass ratio to obtain the stock oil composition of Example 3. The light oil in the stock oil composition of Example 3 The content rate of is shown in Table 1.

[0227] 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.

[0228] 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 analyzer became 19.6 μm, thereby obtaining a raw coke powde...

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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 4-30 nm, the surface area based on volume as calculated by a laser diffraction-type particle size distribution measurement device is 0.22-1.70 m2 / cm3, the oil absorption is 67-147 mL / 100g, and the half-value width [delta][nu]G is 19-24 cm-1 for a peak appearing in the wavelength region of 1580 cm-1+ / -100 cm-1 in Raman spectroscopy using argon ion laser light having a wavelength of 514.5 nm.

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. 2019-004663 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
CPCC01B32/205H01M4/587Y02E60/10C01P2002/60C01P2006/12C01P2002/82C01P2006/19H01M10/0525C01P2002/70C01B32/21C01P2002/72
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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