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Carbonaceous material dispersion liquid and method for producing same

A technology of carbonaceous material and manufacturing method, which is applied in the field of carbonaceous material dispersion and its manufacturing, can solve the problem of unstable characteristics of carbonaceous material dispersion, and achieve the effect of low viscosity and good electrical characteristics

Pending Publication Date: 2022-01-04
REFINE HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Conventionally, in carbonaceous material dispersions, in order to achieve the above-mentioned low viscosity, amine compounds are added as volatile pH adjusters, but even if such amine compounds are added, the characteristics of carbonaceous material dispersions are not stable. does not become a fixed viscosity

Method used

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  • Carbonaceous material dispersion liquid and method for producing same
  • Carbonaceous material dispersion liquid and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0179] In a glass bottle, put 77.5 parts of NMP-A as N-methyl-2-pyrrolidone, 1 part of PVA as a dispersant, and 0.5 parts of AEPD as a specified amine, mix and dissolve fully, or mix and disperse, then add 21 parts of carbon black granular products were dispersed in a bead mill using zirconia beads as a medium until the viscosity became 250 mPa·s or less. Carbonaceous material dispersion liquid D-1 was obtained. The initial viscosity of the carbonaceous material dispersion D-1 was 174 mPa·s. Moreover, the peak of the particle size measured by the laser diffraction particle size distribution meter is as follows: figure 1 As shown, it exists at 1.01 μm and 0.25 μm, and its peak ratio is 1.0:0.9.

[0180] After standing at 25°C for 10 days, the viscosity of the dispersion was 166 mPa·s, and the rate of change in viscosity was 5%. After standing for 17 days, the viscosity of the dispersion was 160 mPa·s, and the rate of change in viscosity was 8%. The viscosity value of the dis...

Embodiment 2

[0182] A carbonaceous material dispersion D-C1 was obtained in the same manner as N-methyl-2-pyrrolidone except that NMP-C1 was used instead of NMP-A. The initial viscosity of the prepared dispersion was 212 mPa·s, and the viscosity of the dispersion after standing at 25° C. for 30 days was 192 mPa·s, with a viscosity change rate of 9%.

Embodiment 3

[0188] As N-methyl-2-pyrrolidone, except having used NMP-AW1 instead of NMP-A, the carbonaceous material dispersion liquid D-AW1 was obtained similarly. The initial viscosity of the prepared dispersion was 210 mPa·s. The viscosity value of the dispersion after standing at 25° C. for 10 days was 191 mPa·s, and the viscosity change rate was 10%.

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Abstract

The present invention relates to a carbonaceous material dispersion liquid and a method for producing the same. The carbonaceous material dispersion liquid stably exhibits very excellent electrical characteristics when being used as a conductive auxiliary agent for a lithium ion secondary battery, in the carbonaceous material dispersion liquid, a carbonaceous material is uniformly dispersed at a high concentration, and the carbonaceous material dispersion liquid is easy to coat. The method for producing the carbonaceous material dispersion is characterized in that a carbonaceous material is dispersed in a non-aqueous solvent containing a nitrogen-containing heterocyclic amide compound having a solvent purity of 99.9% or more, and comprises an amine management concentration confirmation step for confirming that the amine component concentration in the non-aqueous solvent is less than 3*10<-6> by mass fraction; a moisture management concentration confirmation step for confirming that the moisture concentration in the non-aqueous solvent is less than 5*10 <-4> by mass fraction; and a dispersion step for adding the carbonaceous material to the non-aqueous solvent satisfying the conditions in the amine management concentration verification step and the moisture management concentration verification step, so that the carbonaceous material concentration is 15-30% by mass relative to the total mass; and stirring and mixing the carbonaceous material and the non-aqueous solvent.

Description

technical field [0001] The present invention relates to a carbonaceous material dispersion and a method for producing the same. Specifically, the present invention relates to a dispersion of a carbonaceous material suitable for use as a conductive additive in forming an electrode layer in the field of batteries, particularly in the manufacture of lithium-ion secondary batteries, and a method for manufacturing the same. Background technique [0002] In recent years, high-capacity and high-power lithium-ion secondary batteries have been widely used in many fields, such as portable personal computers, smartphones, mobile phones, and other electronic equipment fields, and electric vehicles, hybrid vehicles, and other automotive fields. In the process of further development in these fields, the performance of lithium-ion secondary batteries and the efficiency of production processes are sought. [0003] An electrode used in a lithium ion secondary battery is usually manufactured...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/174C01B32/15C01B32/194C01B32/156C01B32/21C01B32/00C09C1/56B01F23/50H01M4/62H01M10/0525
CPCC01B32/174C01B32/15C01B32/194C01B32/156C01B32/21C01B32/00C09C1/56H01M4/625H01M10/0525C01B2202/28C01B2204/28Y02E60/10
Inventor 中条胜岩船光纮深泽健佑铃木崇夫竹山友洁
Owner REFINE HLDG CO LTD