Carbon material for negative electrode of lithium ion secondary battery, and production method thereof

A secondary battery and manufacturing method technology, applied in the direction of secondary batteries, battery electrodes, coking carbonaceous materials, etc., can solve the problems of battery capacity degradation, irreversible changes, etc., and achieve the effect of suppressing repetition and high charge and discharge capacity

Active Publication Date: 2013-12-25
JX NIPPON OIL & ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, in the case of float charging, the operating range of the capacity of the positive and negative electrodes also irreversibly changes, causing the problem of battery capacity degradation.

Method used

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  • Carbon material for negative electrode of lithium ion secondary battery, and production method thereof
  • Carbon material for negative electrode of lithium ion secondary battery, and production method thereof
  • Carbon material for negative electrode of lithium ion secondary battery, and production method thereof

Examples

Experimental program
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Effect test

Embodiment

[0101] Hereinafter, the present invention will be described in more detail based on examples and comparative examples, but the present invention is not limited to the following examples.

[0102] 1. Manufacture of raw carbon composition and carbon material

[0103] (1) Embodiment 1

[0104] A mixture of 40% by mass of desulfurized deasphalted oil desulfurized to a range of 0.05 to 0.40% by mass of sulfur content and 60% by mass of RFCC residual oil is introduced into a delayed coker, under an inert gas atmosphere, at a pressure of 700kpa and a temperature of 535 °C to perform coking treatment to obtain a raw carbon composition.

[0105] The sum of the generation rates of hydrogen, C1 gas, and C2 gas generated in the coking process, and the ratio of the sum of hydrogen, C1 gas, and C2 gas among the generated gases containing hydrogen and C1 to C4 gases use the cumulative gas flow rate installed in the delayed coker Calculated by meter and online gas chromatography. In additi...

Embodiment 2

[0111] A carbon material was produced under the same conditions as in Example 1 except that the coking treatment temperature was set at 525°C.

Embodiment 3

[0113] A carbon material was produced under the same conditions as in Example 1 except that the coking treatment pressure was set at 750 kPa.

[0114] (4) Embodiment 4

[0115] The carbon material was produced under the same conditions as in Example 1 except that the mixture to be subjected to the coking treatment was a mixture composed of 70% by mass of desulfurized and deasphalted oil and 30% by mass of RFCC residual oil.

[0116] (5) Embodiment 5

[0117] A carbon material was produced under the same conditions as in Example 4 except that the coking treatment temperature was set at 525°C.

[0118] (6) Embodiment 6

[0119] A carbon material was produced under the same conditions as in Example 5 except that the maximum attained temperature in the graphitization treatment was set to 2800°C.

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Abstract

Provided is a carbon material for use in lithium ion secondary battery negative electrodes which maintains a high charge-discharge capacity and is capable of suppressing capacity degradation accompanying repeated charge / discharge cycles, storage in a charged state, and floating charging. This carbon material for a lithium ion secondary battery negative electrode comprises particles having a laminated structure of multiple plates obtained from a coking coal composition obtained by the delayed coking method under the condition that the ratio of the total of the generation rates (mass%) of a one-carbon hydrocarbon gas (C1 gas), a two-carbon hydrocarbon gas (C2 gas) and a hydrogen gas generated by coking processing of heavy oils, over the formation rate (mass%) of the coking coal composition (total of generation rates / formation rate) is 0.30-0.60. Said structure of is curved into a bow shape, and, in each plate, defining T as the average plate thickness, H as the average bow height including the plate thickness, and L as the average length in the vertical direction, L / T is 5.0 or greater, and H / T is 1.10-1.25.

Description

technical field [0001] The present invention relates to a carbon material which is a negative electrode material of a lithium ion secondary battery, and a method for producing the carbon material. Background technique [0002] Compared with conventional secondary batteries such as nickel-cadmium batteries, nickel-hydrogen batteries, and lead batteries, lithium secondary batteries are lighter in weight and have higher input and output characteristics. Power is expected. Generally, such a battery is constructed by opposing a lithium-containing positive electrode capable of reversibly intercalating lithium and a negative electrode made of a carbon material with a non-aqueous electrolyte interposed therebetween. Therefore, such a battery is assembled in a discharged state, and cannot be brought into a dischargeable state without charging. [0003] The following list uses lithium cobalt oxide (LiCoO 2 ) as a positive electrode, using a carbon material as a negative electrode, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587C01B31/04
CPCH01M4/587H01M4/133H01M10/0525C01B32/05C10G9/005Y02E60/10C01B32/205C10B57/045C10B55/00C01P2006/40Y02T10/70
Inventor 田野保小泽广大山隆铃木贵志西田正利
Owner JX NIPPON OIL & ENERGY CORP
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