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Carbon fiber aggregate and method for manufacturing same, and electrode mixture layer for nonaqueous-electrolyte secondary cell

A carbon fiber and aggregate technology, which is applied in the field of electrode mixture layers for non-aqueous electrolyte secondary batteries, can solve the problem of unexplained filling of active materials or conductive additives, and achieves improved electronic conductivity, improved life characteristics, and improved filling. The effect of density

Pending Publication Date: 2021-03-30
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no elucidation about the filling properties of the active material or conductive additive in the electrode mixture layer.

Method used

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  • Carbon fiber aggregate and method for manufacturing same, and electrode mixture layer for nonaqueous-electrolyte secondary cell

Examples

Experimental program
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Effect test

Embodiment

[0137] Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited to these examples. Various measurements or analyzes in Examples were carried out according to the following methods.

[0138] (1) Shape confirmation of carbon fiber

[0139] Observation and photographing were performed using a desktop electron microscope (manufactured by JEOL Ltd., model NeoScope JCM-6000). From the obtained electron micrographs, 300 places were randomly selected to measure the fiber diameter, and the average value of all the measurement results (n=300) was used as the average fiber diameter of the carbon fiber. The average fiber length was also measured in the same manner.

[0140] (2) X-ray diffraction measurement of carbon fiber

[0141] The X-ray diffraction measurement used RINT-2100 manufactured by Rigaku Co., Ltd., and measured the spacing between lattice planes (d002) and the crystallite size (Lc) according to th...

reference example 1

[0146] [Reference Example 1] (Method for producing mesophase pitch)

[0147] Coal tar pitch with a softening point of 80° C. from which quinoline insoluble components were removed was hydrogenated in the presence of a Ni-Mo catalyst at a pressure of 13 MPa and a temperature of 340° C. to obtain hydrogenated coal tar pitch. The hydrogenated coal tar pitch was heat-treated at 480°C under normal pressure, and then the low-boiling point components were removed under reduced pressure to obtain a mesophase pitch. The mesophase pitch was filtered at a temperature of 340° C. using a filter to remove foreign matter in the pitch, thereby obtaining a purified mesophase pitch.

Embodiment 1

[0149] 60 parts by mass of linear low-density polyethylene (EXCEED (registered trademark) 1018HA, manufactured by ExxonMobil, MFR=1g / 10 minutes) as a thermoplastic resin and 40 parts by mass of the mesophase pitch obtained in Reference Example 1 (mesophase rate of 90.9%, softening point of 303.5°C) with a twin-screw extruder in the same direction ("TEM-26SS" manufactured by Toshiba Machine Co., Ltd., barrel temperature of 300°C, under nitrogen flow) for melting and kneading to prepare a mesophase pitch combination thing. Here, the average dispersion diameter of mesophase pitch in polyethylene is 2.8 mu m, the standard deviation is 2.6 mu m. Regarding the average dispersion diameter, the mesophase pitch composition was observed under a fluorescence microscope, 200 locations were randomly selected from the fluorescence micrographs to measure the dispersion diameter, and the average value of all the measurement results (n=200) was taken as the average dispersion diameter.

[0...

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Abstract

With the present invention a carbon fiber aggregate is provided that has an average fiber diameter of 100-1000 nm, and a fiber diameter variation coefficient (CV value) greater than 0.5 and less thanor equal to 1.0.

Description

technical field [0001] The present invention relates to a carbon fiber aggregate, a method for producing the carbon fiber aggregate, and an electrode mixture layer for a nonaqueous electrolyte secondary battery. Background technique [0002] Carbon nanomaterials, especially with an average fiber diameter of 1 mu Ultrafine carbon fibers below m are used as nanofillers for high-performance composite materials due to their excellent properties such as high crystallinity, high electrical conductivity, high strength, high elastic modulus, and light weight. Its use is not limited to nano fillers for reinforcement for the purpose of improving mechanical strength, but also effectively utilizes the high electrical conductivity and high thermal conductivity of carbon materials, and studies its use as additive materials for electrodes of various batteries or capacitors, and electromagnetic wave shielding. Materials, conductive nanofillers for antistatic materials, or as nanofillers bl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/15H01M4/133
CPCY02E60/10D01F9/145D01F6/46H01M4/625H01M4/13D01F9/15H01M4/133D01F11/06D10B2101/12H01M4/0471
Inventor 小村伸弥
Owner TEIJIN LTD
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