Graphite material, method for producing same, carbon material for battery electrodes, and battery

A technology of graphite materials and manufacturing methods, applied in battery electrodes, graphite, secondary batteries, etc., can solve problems such as poor cycle characteristics, low initial efficiency, and reduced electrode performance

Inactive Publication Date: 2013-09-25
RESONAC HOLDINGS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If such an electrode is used for charging, the electrode will only expand in one direction, reducing the performance as an electrode
It has also been proposed to granulate natural graphite into a spherical shape, but the natural graphite is crushed and oriented due to the spheroidization during electrode production.
In addition, since the surface of natural graphite is active, a large amount of gas is generated at the initial charging, and the initial efficiency is low, and the cycle characteristics are not good.

Method used

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  • Graphite material, method for producing same, carbon material for battery electrodes, and battery
  • Graphite material, method for producing same, carbon material for battery electrodes, and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0171]The residue after vacuum distillation of crude oil produced in Venezuela (specific gravity 3.4° API, asphaltene content 21%, resin content 11%, sulfur content 3.3%) is used as raw material and put into the delayed coking process. At this time, the operation was performed with the outlet temperature of the heating furnace heater in front of the coke drum set at 570°C. The internal pressure is 20 psig. Next, water-cooled and discharged from the coke drum, then heated at 120° C., and dried until the water content was 0.5% or less, was used as dry coke 1 . At this point, the heating loss of coke in the argon atmosphere from 300° C. to 1200° C. was 11.8% by mass. This was pulverized with a bantam mill manufactured by Hosokawa Micron. Next, airflow classification was performed with a turbo classifier TC-15N manufactured by Nisshin Engineering to obtain a carbon material with D50=17.5 μm. The pulverized carbon material was filled in a graphite crucible with a screw cap under...

Embodiment 2

[0174] Dried coke 1 used in Example 1 was adjusted with a small mill and a turbo classifier so that D50 became 17.5 μm. This pulverized carbon material was filled into a graphite crucible with a screw cap.

[0175] Next, in the Acheson furnace for graphitizing artificial graphite electrodes, the filler powder 2 was filled with a carbon material (aspect ratio of 2.5) obtained by pulverizing petroleum-based coke 1 into a D50 of 450 μm. The above-mentioned graphite crucible was buried in the Acheson furnace to a depth of 50 cm. The distance from the bottom of the Acheson furnace to the bottom of the graphite crucible is 50cm, and the shortest distance from the side of the Acheson furnace to the side of the graphite crucible is 50cm. The furnace was energized and heat-treated at 3100° C. to obtain a graphite material. After measuring various physical properties of this sample, electrodes were fabricated as described above, and cycle characteristics and the like were measured. T...

Embodiment 3

[0177] Dried coke 1 used in Example 1 was adjusted with a small mill and a turbo classifier so that D50 became 17.5 μm. This pulverized carbon material was filled into a graphite crucible with a screw cap.

[0178] Next, in the Acheson furnace for graphitizing artificial graphite electrodes, the carbon material obtained by pulverizing petroleum-based coke 1 to a D50 of 17.5 μm was filled as filler powder 1 . The aforementioned graphite crucible was embedded in the Acheson furnace to a depth of 30 cm. The distance from the bottom of the Acheson furnace to the bottom of the graphite crucible is 50cm, and the shortest distance from the side of the Acheson furnace to the side of the graphite crucible is 50cm. The furnace was energized and heat-treated at 3100° C. to obtain a graphite material. After measuring various physical properties of this sample, electrodes were fabricated as described above, and cycle characteristics and the like were measured. The results are shown in T...

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Abstract

The present invention provides: a graphite material which is suitable as an electrode material for nonaqueous electrolyte secondary batteries; a method for producing the graphite material; a carbon material for battery electrodes; and an excellent secondary battery which has an extremely small irreversible capacity,while maintaining charge / discharge cycle characteristics, large-current load characteristics and discharge capacity at high levels. A graphite material, wherein the oxygen amount (a) (mass%) in the region from the particle surface to 40 nm in the depth direction is within the range of 0.010<= a <= 0.04 as determined by the peak intensity of O1s obtained by HAX-PES measurement using a hard X-ray of 7,940 eV, can be used as a carbon material for battery electrodes that have excellent initial efficiency and small irreversible capacity, while maintaining large-current load characteristics, cycle characteristics and discharge capacity at high levels.

Description

technical field [0001] The invention relates to a graphite material, a carbon material for a battery electrode and a battery. More specifically, it relates to a graphite material suitable as an electrode material for a non-aqueous electrolyte secondary battery, a method for producing the same, a carbon material for battery electrodes, and a secondary battery excellent in charge-discharge cycle characteristics and high-current load characteristics. Background technique [0002] Lithium-ion secondary batteries are mainly used as power sources for portable devices and the like. Portable devices and other functions diversify and consume more and more power. Therefore, in lithium-ion secondary batteries, it is required to increase the battery capacity and improve the charge-discharge cycle characteristics. In addition, there is an increasing demand for high-output and large-capacity secondary batteries for power tools such as electric drills and for hybrid vehicles. Lead secon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M4/587
CPCC01B32/20C01B32/205H01M4/133H01M4/587H01M10/0525H01M2004/021Y02E60/10Y10T428/2982C01P2002/70C01P2004/61C01P2006/12
Inventor 须藤彰孝上条祐一田中麻纱子安倍朋弘
Owner RESONAC HOLDINGS CORPORATION
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