Composite graphite particles and lithium secondary battery using the same

A technology of composite graphite and particles, which is applied in the field of negative electrodes, lithium secondary batteries, and negative electrode pastes. It can solve the problems of low charging characteristics and insufficient material cycle characteristics, and achieve the effect of excellent characteristics and high lithium ion acceptance capacity.

Inactive Publication Date: 2012-02-01
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of Patent Documents 2 to 4, the cycle characteristics of these materials are insufficient
In addition, the charging characteristics of these materials are low

Method used

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  • Composite graphite particles and lithium secondary battery using the same

Examples

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Effect test

Embodiment 1

[0121] Petroleum coke is used as a material and pulverized into powder with an average particle size of 5 microns or less. The powder was heat-treated at 3000°C in an Acheson furnace to obtain a core material with a d value of 0.3359 nm. To this was added the isotropic pitch in powder form in an amount of 1% by mass of the core material. Then, heat treatment was performed at 3000° C. under an argon atmosphere, thereby obtaining the composite graphite of the present invention. The evaluation results for this graphite material are shown in Table 1.

Embodiment 2

[0123] Petroleum coke is used as a material and pulverized into a powder with an average particle size of 15 microns or less. The powder was heat-treated at 3000°C in an Acheson furnace to obtain a core material with a d value of 0.3359 nm. To this was added the isotropic pitch in powder form in an amount of 1% by mass of the core material. Then, heat treatment was performed at 1100° C. under an argon atmosphere, thereby obtaining the composite graphite of the present invention. The evaluation results of the obtained graphite materials are shown in Table 1.

Embodiment 3

[0125] Petroleum coke is used as a material and pulverized into powder with an average particle size of 30 microns or less. The powder was heat-treated at 3000°C in an Acheson furnace to obtain a core material with a d value of 0.3359 nm. To this was added the isotropic pitch in powder form in an amount of 1% by mass of the core material. Then, heat treatment was performed at 1100° C. under an argon atmosphere, thereby obtaining the composite graphite of the present invention. The evaluation results of the obtained graphite materials are shown in Table 1.

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Abstract

The present invention provides composite graphite particles, which are useful for a negative electrode in a secondary battery having high capacitance, good charge- discharge characteristics and good charge-discharge cycle characteristics; and a paste for negative electrode, a negative electrode and a lithium secondary battery which use the composite graphite particles. The composite graphite particles of the present invention comprises a core material consisting of graphite having a interlayer distance d(002) of 0.337 nm or less in which the intensity ratio ID / IG (R value) between the peak intensity (ID) in a range of 1300 to 1400 cm-1 and the peak intensity ( IG ) in a range of 1580 to 1620 cm-1 as measured by Raman spectroscopy spectra is from 0.01 to 0.1 and a carbonaceous surface layer in which the intensity ratio ID / IG (R value) between the peak intensity (ID) in a range of 1300 to 1400 cm-1 and the peak intensity ( IG) in a range of 1580 to 1620 cm-1 as measured by Raman scattering spectroscopy is 0.2 or higher; wherein the peak intensity ratio I110 / I004 between the peak intensity (I004) of face (110) and the peak intensity (I004 ) of face (004) obtained by XRD measurement on the graphite crystal is 0.2 or higher when the particles are mixed with a binder and pressure-molded to a density of 1.55 to 1.65 g / cm3.

Description

technical field [0001] The present invention relates to composite graphite particles and their uses. More specifically, the present invention relates to composite graphite particles useful as an active material for a negative electrode in a secondary battery having good charge-discharge characteristics and good charge-discharge cycle characteristics, a method for producing the same, and a negative electrode using the composite graphite particles Paste, negative electrode and lithium secondary battery. Background technique [0002] Lithium secondary batteries have been widely used as power sources for portable devices and the like. In the early days after mobile phones, they faced many challenges, such as insufficient battery capacity and short charge-discharge cycle life. These problems have been solved one by one, and now the use of lithium secondary batteries has expanded from mobile phones, notebook computers, digital cameras, etc. to power tools, electric bicycles, etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCH01M4/133H01M10/052H01M4/587Y02E60/122C01B31/04H01M4/1393C01B32/21Y02E60/10H01M4/366H01M4/625C01B32/05H01M10/0525H01M4/621C01P2002/74C01P2004/80C01P2006/40
Inventor 外轮千明须藤彰孝武内正隆韩京熙韩贞敏吴政勋
Owner SHOWA DENKO KK
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