Anode material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery using such anode material

A non-aqueous electrolyte and negative electrode material technology, applied in the field of non-aqueous electrolyte batteries, can solve the problems of low industrial reliability, difficult carbon fiber rolling/cutting operations, and difficulty in determining material parameters.

Inactive Publication Date: 2013-10-30
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This carbon fiber rolling / cutting operation presents various difficulties compared to the aforementioned rolling of bulk carbon materials
In this way, not only is it prone to cracking, as mentioned before, but it is also difficult to determine the parameters of the material, such as aspect ratio, etc.
[0021] For these reasons, it can only be concluded that the energy (density) and industrial reliability of batteries made of conventional graphitized carbon fibers are insufficient from the existing performance

Method used

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  • Anode material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery using such anode material
  • Anode material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery using such anode material
  • Anode material for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery using such anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0169] (a) Preparation of negative electrode materials

[0170] The coal-based pitch was heated at 425° C. for 5 hours in an inert gas atmosphere to obtain a coal-based mesophase pitch with a softening temperature of 220° C. The mesophase ratio at this time was 92%.

[0171] The coal-based mesophase pitch thus obtained was subjected to a discharge fiber-forming operation at a temperature of 300° C. at a predetermined demolding pressure, thereby obtaining precursor fibers. Then, infusible treatment is performed at a temperature of 260° C., and then calcined in an inert gas atmosphere at a temperature of 1000° C. to obtain carbon fibers. This carbon fiber is further heat-treated at a temperature of 3000° C. in an inert gas atmosphere, and finally subjected to jet crushing to obtain graphitized carbon fiber powder.

[0172] The cross-sectional shape of the powder thus obtained was observed with an electron microscope to determine its shape and size. In addition, the area filli...

Embodiment 2

[0189] The preparation of graphitized carbon fibers was similar to Example 1, with the only difference that the precursor fibers used were prepared by heating coal-based pitch at 425 °C for 2 hours in an inert gas atmosphere, and then Heated at 400°C for 2 hours, and then heated at 350°C for 24 hours in an inert gas atmosphere. Finally, the heat-treated coal-based mesophase pitch (95% of the mesophase ratio) was discharged into fibers, and the non-aqueous Electrolyte battery.

[0190] In this example, the fiber shape and average size of the graphitized carbon fibers obtained by the above-mentioned method were measured in a similar manner to Example 1, thereby calculating the area filling rate and circularity ratio, and finally measuring the bulk density.

[0191] The results are shown in Table 1. In addition, the cross-sectional shape of the fiber is shown in Figure 8 middle.

Embodiment 3

[0193] The preparation of graphitized carbon fibers is similar to that of Example 1, with only the following difference, that is, the precursor fibers used are prepared in this way: oil-based pitch was heated at 430 ° C for 3 hours in an inert gas atmosphere, and then heat-treated The oil-based mesophase pitch with a softening temperature of 210°C is discharged into fibers, and a non-aqueous electrolyte battery is further prepared.

[0194] In this example, the fiber shape and average size of the graphitized carbon fibers obtained by the above-mentioned method were measured in a similar manner to Example 1, so as to calculate the area filling ratio and roundness ratio, and finally measure the bulk density.

[0195] The results are shown in Table 1. In addition, the cross-sectional shape of the fiber is shown in Figure 9 middle.

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Abstract

Carbon fibers whose cross-sectional shape satisfies the condition that the area filling ratio is not less than 0.8 are used as negative electrode materials for nonaqueous electrolyte storage batteries. On the other hand, since the fractal value of the cross-sectional high-order structure of random radial carbon fibers can be used as a material parameter for evaluating the cross-sectional structure, such carbon fibers are also used as negative electrode materials for non-aqueous electrolyte batteries: Wherein, the aforementioned fractal dimension value is within the range of 1.1 to 1.8, and the crystallinity is controlled within a reasonable range. Further, carbon fibers with the following cross-sectional high-order structure are also used as negative electrode materials for non-aqueous electrolyte batteries: the central part is a radial structure, and the surface part is a random radial structure. Furthermore, it is also very effective to use carbon fiber with a grooved structure on the cross section. In addition, by preparing graphitized carbon fibers having transverse sections different in crystal structure distributed at a specific period in the fiber length direction, by rolling such graphitized carbon fibers, carbon fibers with less heterogeneity and specific aspect ratios can be easily prepared powder.

Description

[0001] This application is that the application number is 97190989.X, and the application date is on June 27, 1997, and the title of invention is the application (and its Divisional application 200410002791.8) is a divisional application. technical field [0002] The present invention relates to a negative electrode material for a nonaqueous electrolyte storage battery made of carbon material, especially fibrous carbon, and further relates to a nonaqueous electrolyte storage battery using the negative electrode material. Background technique [0003] Recent electronic technologies have made very remarkable progress, making it possible, for example, to miniaturize and / or reduce the weight of electronic equipment. As a result, there has been an ever-increasing demand for miniaturization, light weight, and high energy density for batteries for portable power devices. [0004] So far, as commonly used storage batteries, batteries with an aqueous electrolyte system, such as lead...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/38H01M10/40H01M4/587D01F9/12D01F9/15D01F11/12H01M4/02H01M4/04H01M4/133H01M6/16H01M10/0525H01M10/0566
CPCD01F9/15D01F11/12H01M4/0433H01M4/133H01M4/587H01M10/0525H01M2004/021H01M2004/022H01M2300/004Y02E60/10Y02P70/50H01M4/583H01M4/04
Inventor 小丸笃雄中岛尚幸永峰政幸
Owner SONY CORP
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