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Carbon Black Dispersion and Its Utilization

A technology of dispersion liquid and carbon black, which is applied in fibrous fillers, coatings, non-aqueous electrolyte battery electrodes, etc., can solve the problems of consuming a lot of energy and time, and achieve reduced usage, low surface resistance, and coating film physics. stable effect

Active Publication Date: 2017-09-26
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 Its Utilization
  • Carbon Black Dispersion and Its Utilization
  • Carbon Black Dispersion and Its Utilization

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 and mix and dissolve them thoroughly, or after mixing and dispersing, add various carbon blacks and use 1.25mmφ zirconia beads as the medium. It was dispersed with a paint shaker for 2 hours to obtain each carbon black dispersion. They all have low viscosity and small D50 value, and have good storage stability. In addition, it was clarified that whether polyvinyl alcohol was modified or not had no major 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, mix and dissolve it thoroughly, or after mixing and dispersing, add various carbon blacks, use 1.25mmφ zirconia beads as the medium, and use paint The dispersion was performed for 2 hours with a shaker, and each carbon black dispersion liquid was obtained. They all have low viscosity and small D50 value, and have 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, mix and dissolve it thoroughly, or after mixing and dispersing, add various carbon blacks, use 1.25mmφ zirconia beads as the medium, and use paint The dispersion was performed for 2 hours with a shaker, and each carbon black dispersion liquid was obtained. Since the obtained dispersion liquids were all in a state of remarkably high viscosity and a large D50 value, the carbon bla...

Embodiment 2-1～ Embodiment 2-16

[0290] According to the composition shown in Table 1-2, put NMP, various polyvinyl alcohols and various binders into glass bottles, mix and dissolve them thoroughly, or add various carbon blacks after mixing and dispersing, using a homogenizer After dispersion for 1 hour, each carbon black dispersion liquid was obtained. None of them has coarse particles, has low viscosity, and has 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 with excellent 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 battery field, carbon black is widely used as a conductive aid. However, in order to efficiently shorten the production process when forming the battery electrode composite material layer, it is important to disperse the carbon black in the solvent in a high concentration and uniform manner. Medium so that it can be easily coated. [0003] In recent years, especially from the perspective of the environment and production costs, there is a need to reduce the amount of solvent used and reduce energy consumption during drying by preparing a carbon black dispersion with a higher concentration than before and uniformly dispersed. [0004] These requirements have a great impact on solven...

Claims

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Application Information

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Patent Type & Authority Patents(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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