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Dispersion/mixture system with dispersion/mixture pump used for manufacturing slurry containing carbon

A mixing system and dispersing technology, applied in the directions of mixers, mixers with rotary stirring devices, mixing methods, etc., can solve the problems of coating voids, difficulty, and easy mixing and residual of air bubbles, so as to reduce the mixing of air bubbles, simplify the The effect of the defoaming process

Pending Publication Date: 2020-05-19
NIHON SPINDLE MFG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, although solid components such as positive electrode active materials or negative electrode active materials, conductive materials, and binders, and solvents such as water are put into such as Figure 9 The dispersion and mixing of solid components (including the dissolution of soluble solid components) are carried out in the batch type multi-shaft mixer shown to obtain the above-mentioned slurry. However, when carbon used as a conductive material, especially the aspect ratio In the case of fibrous toner with a large (length / diameter), or a substance with poor dispersibility and solubility such as CMC (carboxymethyl cellulose) used as a binder, it may be difficult to obtain a uniform pulp materials, or it is difficult to maintain the state of dispersion and mixing of solid components, or the dispersion and mixing of solid components takes time, etc.
[0007] In addition, when using the above-mentioned batch type multiaxial mixer, air bubbles are easily mixed in and remain in the slurry. If the slurry mixed with air bubbles is applied to the substrate of the electrode and heated and dried, the coating will problems with voids

Method used

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  • Dispersion/mixture system with dispersion/mixture pump used for manufacturing slurry containing carbon
  • Dispersion/mixture system with dispersion/mixture pump used for manufacturing slurry containing carbon
  • Dispersion/mixture system with dispersion/mixture pump used for manufacturing slurry containing carbon

Examples

Experimental program
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Effect test

Embodiment 1

[0193] (high rate discharge test)

[0194] As shown in Table 1, LiFePO is used as a slurry material used in the manufacture of electrodes for non-aqueous electrolyte secondary batteries, that is, a material that absorbs and releases alkali metal ions. 4 (91wt%), carbon (carbon black (2wt%), fibrous carbon powder with an aspect ratio of 10 to 1000, and an average fiber diameter of 1 to 500nm carbon (carbon nanotubes) (2wt%)), and a water-based binder (CMC (carboxymethylcellulose) (5wt%)) (solid content ratio: 31wt%), using water as the solvent R, and using the dispersion mixing system 100 equipped with the dispersion mixing pump Y to produce a slurry.

[0195] In addition, Fig. 10 (a) and Fig. 10 (b) show the electrode surface coated with the carbon-containing slurry and the electron micrograph of the electrode cross section (Fig. 10 (a) is based on the conventional batch type multiaxial mixer The photo of Fig. 10 (b) is the photo based on the manufacture method of carbonaceou...

Embodiment 2

[0203] (high rate discharge test)

[0204] As shown in Table 2, as a slurry material used in the manufacture of electrodes for non-aqueous electrolyte secondary batteries, that is, a material that absorbs and releases alkali metal ions, LiFePO 4 (89wt%), carbon (carbon black (1.5wt%), carbon (carbon nanotubes) (1.5wt%), activated carbon (3wt%) ) and a water-based adhesive (acrylate (5wt%)) (solid content ratio: 37wt%), using water as the solvent R, and using the dispersion mixing system 100 equipped with the dispersion mixing pump Y to produce a slurry.

[0205] Test electrode (positive electrode) After coating the obtained slurries on an aluminum foil with a thickness of 20 μm and drying, the aluminum foil and the coating film were adhered and bonded by a roller press, and then heat-treated (under reduced pressure, at 150 °C for more than 12 hours) to obtain a positive electrode capacity density of 2.1mAh / cm 2 the electrodes. And make a button battery (CR2032), which uses ...

Embodiment 3

[0224] As shown in Table 3, as a slurry material used in the manufacture of electrodes for non-aqueous electrolyte secondary batteries, that is, a material that absorbs and releases alkali metal ions, LiMn 0.33 Ni 0.33 co 0.33 o 2 (91wt%), carbon (carbon black (2wt%), carbon (carbon nanotubes) (2wt%) with an aspect ratio of fibrous carbon powder of 10 to 500, and an average fiber diameter of 150nm (2wt%)), and a water-based binder (acrylic acid Esters (5 wt %)) (solid content ratio: 32 wt %), using water as the solvent R, and using the dispersion mixing system 100 equipped with the dispersion mixing pump Y as a result of producing a slurry.

[0225] [table 3]

[0226]

[0227] Test electrode (positive electrode) After coating the obtained slurries on an aluminum foil with a thickness of 20 μm and drying, the aluminum foil and the coating film were adhered and bonded by a roller press, and then heat-treated (under reduced pressure, at 150 °C for more than 12 hours) to ob...

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Abstract

The present invention provides a dispersion / mixture system in which a uniform slurry utilized for manufacturing an electrode for a nonaqueous electrolyte secondary battery can be obtained even with carbons of low dispersibility or solubility. The dispersion / mixture system comprises a dispersion / mixture pump with which, in a cylindrical casing, a rotor comprising rotary vanes is disposed concentrically, the rotor is rotationally driven, and a solid content and a solvent are sucked into a first introduction chamber that is formed within the cylindrical casing, via a first supply part, stirred bythe rotary vanes and discharged from a discharge part via a discharge chamber. The liquid discharged from the discharge part is circulated into a second supply part via a circulation channel, suckedfrom the second supply part into a second introduction chamber that is formed within the cylindrical casing while being partitioned from the first introduction chamber by a partition plate, passed through a squeeze channel that is formed in a stator, stirred by the rotary vanes and discharged from the discharge part via the discharge chamber and further, the liquid discharged from the discharge part is circulated to the second supply part via the circulation channel.

Description

[0001] This application is a divisional application of a Chinese invention patent application with an application date of March 4, 2014, an application number of 201410076928.8, and a title of "Dispersion Mixing System for Manufacturing Carbon-Containing Slurry and Manufacturing Method of Carbon-Containing Slurry" . technical field [0002] The invention relates to a dispersive mixing system for the manufacture of carbonaceous slurries. Background technique [0003] In the past, as non-aqueous electrolyte secondary batteries, lithium-ion secondary batteries have been widely used in various electronic devices such as personal computers and mobile devices. However, as their use is expanded to automobiles and aircraft, etc., it is required to improve battery performance. Increased density and increased capacity are required. [0004] In addition, as one of the important factors for determining battery performance, the characteristics of the slurry used in the production of ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F13/10B01F3/12B01F7/18B01F15/02H01M4/04B01F25/60
CPCY02E60/10H01M4/139H01M10/0525
Inventor 别惣俊二浅见圭一
Owner NIHON SPINDLE MFG CO LTD
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