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Graphite material, carbon material for battery electrode, and battery

A graphite material and battery electrode technology, applied in battery electrodes, batteries, graphite, etc., can solve problems such as poor cycle characteristics, low initial efficiency, and reduced electrode performance, and achieve high cycle characteristics, improved safety, and mass production excellent effect

Active Publication Date: 2013-09-25
RESONAC 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, carbon material for battery electrode, and battery
  • Graphite material, carbon material for battery electrode, and battery
  • Graphite material, carbon material for battery electrode, and battery

Examples

Experimental program
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Effect test

Embodiment 1

[0196] The residue obtained by atmospheric distillation of crude oil from Mexico was used as a raw material. This raw material has a specific gravity of 0.7° API, an asphaltene component of 15% by mass, a resin component of 14% by mass, and a sulfur content of 5.3% by mass. This raw material is put into a delayed coking process. At this time, the temperature at the outlet of the heating furnace heater before the coke drum was set to 560° C., and the pressure inside the drum was set to about 207 kPa (30 psig). It is water-cooled and discharged from the coking drum. The obtained coke was heated at 120° C. and dried until the water content was 0.5% by mass or less. At this point, the heating loss in the argon atmosphere from 300° C. to 1200° C. was 13.1% 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 Nissin Engineering to obtain a carbon material with D5...

Embodiment 2

[0200] The residue obtained by vacuum distillation of crude oil from California was used as a raw material. This raw material has a specific gravity of 3.0° API, an asphaltene component of 28% by mass, a resin component of 11% by mass, and a sulfur content of 3.5% by mass. This raw material is put into a delayed coking process. At this time, the furnace was operated at an internal pressure of about 214 kPa (31 psig) at a heater outlet temperature of 570°C before the coke drum. The obtained coke was in a state of being granulated into particles having a particle diameter of about 3 to 8 mm, unlike usual ones. This was water-cooled and discharged from the coking drum, heated at 120° C., and dried until the water content was 0.5% by mass or less. At this point, the heating loss in the argon atmosphere from 300° C. to 1200° C. was 12.8% by mass. This was pulverized with a small mill manufactured by Hosokawa Micron. Next, airflow classification was performed with a turbo classi...

Embodiment 3

[0204]The residue obtained by vacuum distillation of crude oil from Venezuela was used as a raw material. This raw material has a specific gravity of 3.4° API, an asphaltene component of 21% by mass, a resin component of 11% by mass, and a sulfur content of 3.3% by mass. This raw material is put into a delayed coking process. At this time, the internal pressure is about 138kPa (20psig), and the heater outlet temperature of the heating furnace in front of the coke drum is operated at 570°C. Coke was discharged from the coking drum by water cooling, heated at 120°C, and dried until the water content was 0.5% by mass or less. At this point, the heating loss in the argon atmosphere from 300° C. to 1200° C. was 11.8% by mass. This was pulverized with a small mill manufactured by Hosokawa Micron. Next, airflow classification was performed with a turbo classifier TC-15N manufactured by Nissin Engineering to obtain a carbon material with D50=15.0 μm substantially free of particles ...

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Abstract

The present invention provides a graphite material which, when 200 locations in a rectangular area of 6 [mu]m by 8 [mu]m are arbitrarily selected on a graphite material surface image observed by scanning electron microscope, cylindrical pores, which have an opening shape with a diameter of 15 nm to 200 nm, a roundness of 0.75 to 1.0, and a major axis / minor axis ratio of 1.0 to 1.5, are visible on the surface of the graphite material that appears in said area in at least two locations. This graphite material is suitable as an electrode material for rechargeable batteries, and has excellent charge / discharge cycle characteristics and high current load characteristics.

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 nonaqueous electrolyte secondary battery, a carbon material for a battery electrode, 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. [0003] 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 secondary batteries, nickel-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H01M4/36
CPCH01M4/583H01M2004/021H01M4/364H01M10/0525H01M10/0569H01M2220/20C01B32/20C01B32/21C01B32/205Y02E60/10H01M4/587H01M10/0565C01P2002/74C01P2002/82C01P2002/78C01P2004/32C01P2004/61C01P2004/54C01P2006/14C01P2006/16C01P2006/12Y02P70/50Y02T10/70H01M2300/0028
Inventor 胁坂安显上条祐一武内正隆深井孝行外轮千明须藤彰孝田中麻纱子
Owner RESONAC CORPORATION
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