Carbon black dispersion and use thereof

A technology of dispersion liquid and carbon black, applied in fibrous fillers, coatings, non-aqueous electrolyte battery electrodes, etc., can solve the problems of high energy and time consumption, reduce the amount of use, stable physical properties of the coating film, resistant to good effect

Active Publication Date: 2015-11-18
TOYO INK SC HOLD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The boiling point of N-methyl-2-pyrrolidone is 202°C, which is very high, so it takes a lot of energy and time to dry the electrode composite material liquid

Method used

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  • Carbon black dispersion and use thereof
  • Carbon black dispersion and use thereof
  • Carbon black dispersion and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1～ Embodiment 1-7

[0280] According to the composition shown in Table 1-1, put NMP and various polyvinyl alcohols into glass bottles, mix and dissolve thoroughly, or add various carbon blacks after mixing and dispersing, and use 1.25mmφ zirconia beads as the medium, Dispersion was carried out for 2 hours using a paint shaker to obtain each carbon black dispersion liquid. All of them have low viscosity and small D50 value and good storage stability. In addition, it was found that the presence or absence of modification of polyvinyl alcohol does not have a great influence on the performance as a dispersant.

Embodiment 1-8～ Embodiment 1-24

[0285] According to the composition shown in Table 1-1, put NMP and polyvinyl alcohol into a glass bottle, fully mix and dissolve, or after mixing and dispersing, add various carbon blacks, use 1.25mmφ zirconia beads as the medium, and use paint The dispersion was carried out with a shaker for 2 hours to obtain each carbon black dispersion liquid. All of them have low viscosity and small D50 value and good storage stability.

[0286] [Comparative Example 1-3, Reference Example 1-1]

[0287] According to the composition shown in Table 1-1, put NMP and polyvinyl alcohol into a glass bottle, fully mix and dissolve, or after mixing and dispersing, add various carbon blacks, use 1.25mmφ zirconia beads as the medium, and use paint The dispersion was carried out with a shaker for 2 hours to obtain each carbon black dispersion liquid. The obtained dispersion liquids were all in a state of remarkably high viscosity and a large D50 value, so that the carbon black could not be sufficie...

Embodiment 2-1～ Embodiment 2-16

[0290] According to the composition shown in Table 1-2, put NMP, various polyvinyl alcohols and various adhesives into glass bottles, mix and dissolve thoroughly, or add various carbon blacks after mixing and dispersing, and use a homogenizer Dispersion was carried out for 1 hour to obtain each carbon black dispersion liquid. All of them have no coarse particles, have low viscosity, and have good storage stability.

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Abstract

Provided is a carbon black dispersion in which N-methyl-2-pyrrolidone that can achieve dispersibility at a lower viscosity and a higher concentration and can also achieve superior storage stability compared with conventional resin-type dispersants is used as a solvent. Also provided are: a battery electrode mix layer which is homogeneous and has good coating film properties and low surface resistance; and a lithium ion secondary battery equipped with the battery electrode mix layer. The problems can be solved by, for example, a carbon black dispersion comprising carbon black, polyvinyl alcohol (or a combination of polyvinyl alcohol with a pigment derivative) that serves as a dispersant, and N-methyl-2-pyrrolidone that serves as a solvent, said carbon black dispersion being characterized in that the degree of saponification of polyvinyl alcohol is 60 to 85 mol% and the value (a) falls within the range from 0.00017 to 0.00256 inclusive wherein X (m2 / g) represents the BET specific surface area of carbon black and aX (g) represents the addition amount of polyvinyl alcohol relative to 1 g of carbon black.

Description

technical field [0001] The invention relates to a carbon black dispersion liquid excellent in dispersibility and storage stability. In addition, it also relates to a battery electrode composite material layer and a lithium ion secondary battery using the dispersion liquid. Background technique [0002] In the field of batteries, carbon black is widely used as a conductive additive. However, in order to efficiently shorten the production process when forming the battery electrode composite material layer, it is important to disperse carbon black in a solvent at a high concentration and uniformly. medium so that it can be easily applied. [0003] In recent years, especially from the viewpoint of the environment and production cost, it has been demanded to reduce the amount of solvent used and the energy consumption during drying by preparing a uniformly dispersed carbon black dispersion at a higher concentration than before. [0004] These requirements have a great influence...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D17/00C09C1/48C09D7/12C09D129/04H01M4/13H01M4/139H01M4/62
CPCY02E60/10
Inventor 高桥康平真木伸一郎广田尚久寺泽昌洋
Owner TOYO INK SC HOLD CO LTD
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