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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, excellent performance, and high cycle characteristics Effect

Active Publication Date: 2015-05-13
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 the raw material graphite, the following natural flaky graphite particles 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 argon ion laser Raman spectrum -1 Nearby peak intensity is 1580cm -1 The ratio of the nearby peak intensity, 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 scaly graphite particles were continuously processed at a processing speed of 20 kg / hour under the conditions of a rotor peripheral speed of 60 m / sec and 10 minutes. The surface of the graphite particles was spheroidized while being damaged. Then, the fine powder is removed by performing classification treatment.

[0179] The obtained spherical graphite carbon is ...

Embodiment 2

[0202] The same operation as in Example 1 was performed except that the ratio of the carbon material B in 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

To provide a mixed carbon material used for an electrode of a nonaqueous secondary battery with excellent characteristics satisfying both rapid charge-discharge characteristics and high cycle characteristics. A negative electrode material for nonaqueous electrolyte secondary battery, comprising the following carbon material A and carbon material B: (Carbon material A) a multilayer-structure carbon material containing a graphitic particle and an amorphous carbon covering the surface of the graphitic particle, which is a carbon material where the interplanar spacing (d002) of 002 planes by the wide-angle X-ray diffraction method is 3.37 Å or less, Lc is 900 Å or more, the tap density is 0.8 g / cm 3 or more, and the Raman R value that is a ratio of the peak intensity near 1,360 cm -1 to the peak intensity near 1,580 cm -1 in the argon ion laser Raman spectrum, is from 0.25 to 0.6, (Carbon material B) a eaxbon material where the interplanar spacing (d002) of 002 planes by the wide-angle X-ray diffraction method is 3.37 Å or less, Lc is 900 Å or more, the tap density is 0.8 g / cm 3 or more, and the Raman R value that is a ratio of the peak intensity near 1,360 cm -1 to the peak intensity near 1,580 cm -1 in the argon ion laser Raman spectrum, is from 0.11 to 0.2.

Description

Technical field [0001] The present invention relates to a negative electrode material for a non-aqueous electrolyte secondary battery. In addition, the present invention also relates to a negative electrode for a non-aqueous electrolyte secondary battery using the negative electrode material, and a non-aqueous electrolyte secondary battery including the negative electrode. Background technique [0002] Has developed a positive electrode and negative electrode capable of occluding and releasing lithium ions, and dissolved LiPF 6 , LiBF 4 Non-aqueous lithium secondary batteries such as non-aqueous electrolytes of lithium salts have been put into practical use. [0003] As the negative electrode material of this battery, various proposals have been proposed. However, in terms of high capacity and excellent flatness of discharge voltage, artificial graphite obtained by graphitization such as natural graphite and coke has been used. Graphite carbon materials such as mesophase pitch and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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