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Composite graphite particles and use of same

A technology of composite graphite and particles, applied in the direction of graphite, carbon compounds, structural parts, etc., can solve the problems of low battery capacity and low resistance value, and achieve high acceptance and good high-current cycle characteristics

Active Publication Date: 2015-03-18
RESONAC CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Batteries obtained from carbon materials with low crystallinity are known to have high capacity, but cycle degradation is significant
On the other hand, it is known that a battery obtained from a highly crystalline carbon material has a relatively low resistance value and stable cycle characteristics, but the battery capacity is low

Method used

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  • Composite graphite particles and use of same
  • Composite graphite particles and use of same
  • Composite graphite particles and use of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136] Pulverize petroleum coke with an HGI of 40, and 50% of the particle size (D 50 ) adjusted to 15 μm. This was put into an Acheson furnace and heated at 3000°C to obtain a core material made of graphite.

[0137] Powdery isotropic petroleum-based pitch was dry-mixed therein in an amount of 1% by mass relative to the core material, and heated at 1100° C. for 1 hour under an argon atmosphere to obtain composite graphite particles.

[0138] The 50% particle size of the obtained composite graphite particles is 15 μm, and the BET specific surface area is 1.2 m 2 / g, R value 0.85, d 002 0.336nm, I 110 / I 004 is 0.46.

[0139] In addition, the battery obtained by using the composite graphite particles has an initial discharge capacity of 331mAh / g, an initial efficiency of 92%, a cycle capacity retention rate of 0.92, a high-rate cycle capacity retention rate of 0.88, and an input-output characteristic of 4.8Ω.

Embodiment 2

[0141] Composite graphite particles were obtained in the same manner as in Example 1, except that the petroleum-based coke whose HGI was 40 was changed to the petroleum-based coke whose HGI was 50.

[0142] The 50% particle size of the obtained composite graphite particles is 15 μm, and the BET specific surface area is 1.4 m 2 / g, R value is 0.77, d 002 0.337nm, I 110 / I 004 is 0.44.

[0143] In addition, the initial discharge capacity of the battery obtained by using the composite graphite particles is 337mAh / g, the initial efficiency is 90%, and the cycle capacity retention rate is 0.93.

Embodiment 3

[0145] Composite graphite particles were obtained in the same manner as in Example 1, except that the amount of isotropic petroleum-based pitch mixed with the core material made of graphite was changed to 5% by mass relative to the core material.

[0146] The 50% particle size of the obtained composite graphite particles is 15 μm, and the BET specific surface area is 1.1 m 2 / g, R value 0.91, d 002 0.338nm, I 110 / I004 is 0.35.

[0147] In addition, the initial discharge capacity of the battery obtained by using the composite graphite particles is 330mAh / g, the initial efficiency is 91%, and the cycle capacity retention rate is 0.94.

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Abstract

The present invention relates to a composite graphite particle, which is a composite graphite particle having a core material and a carbonaceous layer existing on the surface thereof, and the core material is made of petroleum-based coke with a pulverization index of 35 to 60 at 2500°C or higher and 3500°C or less, the graphite obtained by heat treatment is formed, and the peak intensity (ID) in the range of 1300-1400 cm-1 and the peak intensity (ID) in the range of 1500-1620 cm-1 measured by Raman spectroscopy of the composite graphite particles ( IG) has an intensity ratio ID / IG of 0.1 or more, a 50% particle diameter (D50) in the volume-based cumulative particle size distribution measured by laser diffraction method is 3 μm or more and 30 μm or less, and the density is The ratio I110 / I004 of the intensity (I110) of the 110 diffraction peak measured by X-ray wide-angle diffraction method to the intensity (I004) of the 004 diffraction peak at 1.35 to 1.45 g / cm3 is more than 0.2.

Description

technical field [0001] The present invention relates to composite graphite particles and uses thereof. More specifically, the present invention relates to a negative electrode material useful as a lithium ion battery capable of obtaining a low resistance value and good cycle characteristics during low-current charge and discharge, and a lithium ion battery with a low resistance value, good input-output characteristics, and high-current cycle characteristics. Composite graphite particles, a manufacturing method thereof, and electrode sheets and lithium-ion batteries using the composite graphite particles. Background technique [0002] Lithium-ion batteries are being used as power sources for portable electronic devices and the like. Initially, lithium-ion batteries often had problems of insufficient battery capacity or short charge-discharge cycle life. Nowadays, such problems have been overcome one by one, and the use of lithium-ion batteries has expanded from weak current...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04H01M4/133H01M4/36H01M4/587
CPCH01M4/133H01M4/364H01M4/366H01M4/625C01P2004/61C04B35/62839C04B2235/3225C04B2235/5409C04B2235/5436C01B32/05H01M10/0525H01M4/587C01B32/21C01B32/205Y02E60/10
Inventor 横山义史外轮千明武内正隆
Owner RESONAC CORPORATION
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