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Negative electrode material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery using same

A non-aqueous electrolyte and secondary battery technology, applied in the direction of secondary batteries, battery electrodes, negative electrodes, etc., can solve the problem of increasing the irreversible capacity of amorphous carbon particles, and achieve rapid charge and discharge characteristics, high cycle characteristics, and excellent performance Effect

Active Publication Date: 2012-02-22
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, this non-aqueous lithium secondary battery has the problem of an increase in irreversible capacity due to amorphous carbon particles, and further improvement in the cycle characteristics and rapid charge-discharge characteristics required for recent lithium secondary batteries is required.

Method used

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  • Negative electrode material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0176] (Production of carbon material A)

[0177] As raw material graphite, the following flaky graphite particles produced in nature were used: the interplanar distance (d002) of the 002 plane measured by the wide-angle X-ray diffraction method was 3.36 , Lc is 1000 Above, the tap density is 0.46g / cm 3 , 1360cm in the argon ion laser Raman spectrum -1 Nearby peak intensity and 1580cm -1 The ratio of nearby peak intensities, that is, the Raman R value is 0.13, the average particle size is 28.7μm, and the true density is 2.27g / cm 3 .

[0178] Using the Hybridization System manufactured by Nara Machinery Manufacturing Co., Ltd., the above-mentioned flaky graphite particles were continuously processed at a processing speed of 20 kg / hour under the condition of a rotor peripheral speed of 60 m / s and 10 minutes. The spheroidization process was performed while applying damage to the surface of the graphite particles. Then, fine powder is removed by performing classification t...

Embodiment 2

[0202] The same operation as in Example 1 was carried out except that the ratio of the carbon material B to the total amount of the carbon material A and the carbon material B was 50% by weight. The results are shown in Table 1.

Embodiment 3

[0204] The same operation as in Example 1 was performed except that the ratio of the carbon material B to the total amount of the carbon material A and the carbon material B was 70% by weight. The results are shown in Table 1.

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Abstract

Disclosed is a mixed carbon material for use in an electrode of a non-aqueous secondary battery showing excellent characteristics having rapid charge-discharge characteristics and high cycle characteristics. More particularly, disclosed is a negative electrode material for non-aqueous electrolyte secondary battery comprising the following carbon material A and carbon material B: (carbon material A) a multilayer-structured carbon material which contains graphite particles and amorphous carbon covering the surfaces of the particles, and in which a 002 plane spacing (d002) measured by X-ray wide angle diffraction is 3.37Angstrom or less, Lc is 900Angstrom or more, a tap density is 0.8 g / cm<3> or more, and a Raman R value, which is the ratio of a peak intensity at around 1360 cm<-1> to a peak intensity at around 1580 cm<-1> in an argon ion laser Raman spectrum, is 0.25 to 0.6; and (carbon material B) a carbon material in which a 002 plane spacing (d002) measured by X-ray wide angle diffraction is 3.37Angstrom or less, Lc is 900Angstrom or more, a tap density is 0.8 g / cm<3> or more, and a Raman R value, which is the ratio of a peak intensity at around 1360 cm<-1> to a peak intensity at around 1580 cm<-1> in an argon ion laser Raman spectrum, is 0.11 to 0.2.

Description

technical field [0001] The invention relates to negative electrode materials for non-aqueous electrolyte secondary batteries. In addition, the present invention also relates to a negative electrode for a nonaqueous electrolyte secondary battery using the negative electrode material, and a nonaqueous electrolyte secondary battery including the negative electrode. Background technique [0002] Has developed a positive electrode and a negative electrode that can store and release lithium ions, and LiPF dissolved 6 、LiBF 4 Non-aqueous lithium secondary batteries of non-aqueous electrolytes such as lithium salts have been put into practical use. [0003] As the negative electrode material of this battery, various schemes have been proposed, but from the viewpoints of high capacity and excellent flatness of discharge voltage, artificial graphite obtained by graphitization of natural graphite, coke, etc., graphitized graphite, etc. Graphite carbon materials such as mesophase pit...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/36H01M10/0525H01M10/0566
CPCH01M4/485H01M4/505H01M4/525H01M4/581H01M4/587H01M10/0566H01M4/133H01M4/364H01M4/366H01M10/0525Y02E60/10H01M4/36H01M2004/027Y02T10/70
Inventor 龟田隆佐藤秀治
Owner MITSUBISHI RAYON CO LTD
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