Granular Carbon Black Particle Sizing to Reduce Pulverization
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Solution Overview
Problem
Existing carbon black granulation processes result in granular carbon black with low strength, poor dispersibility, and limited bulk density, leading to pulverization and uneven particle distribution, and the introduction of impurities when using additives.
Innovation Solution
A granular carbon black with controlled particle size distribution (2% <0.125 mm, 18-60% 0.125-0.85 mm, 40-80% >0.85 mm) and secondary particle diameter D50 of 2.0-3.51 µm, prepared by wet granulation with water at specific stirring speeds and ratios, ensuring no additional additives are needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If only water is added to perform granulation on carbon black original powder, then the granulation process is simple, but the obtained granular carbon black has relatively low strength causing pulverization phenomenon
Solution Approach 1:
The patent introduces a binding agent as an intermediary substance during the granulation process. This binding agent mediates between the carbon black particles and water, creating stronger bonds that prevent pulverization while maintaining process simplicity. The binding agent acts as a bridge that enhances particle strength without complicating the overall granulation procedure.
2Ease of manufacture
If only water is added to perform granulation, then the process is simple, but stirring uniformity is poor leading to large fluctuation in particle diameter and limited increase in bulk density
Solution Approach 1:
The binding agent serves as a mediator that improves the interaction between water and carbon black particles during stirring. It enhances wetting uniformity and promotes more consistent particle formation, reducing fluctuation in particle diameter while maintaining the simplicity of the water-based granulation process.
3Strength
If additives are used to improve particle strength, then particle strength increases, but impurities are introduced and dispersion is caused to be poor due to segregation of agglomerated particles
Solution Approach 1:
The patent uses a binding agent that can be used in minimal quantities to achieve the desired particle strength without introducing significant impurities. The binding agent is selected to be compatible with carbon black and not interfere with subsequent processing or application, effectively serving as a temporary aid that fulfills its function without creating long-term harmful effects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enhances bulk density and dispersibility, reduces pulverization, and maintains structural integrity without introducing impurities, improving performance in electrodes and other applications.
Implementation Method 1
wet granulation
Implementation Method 2
adding water or a binding agent to carbon black original powder to perform granulation
Implementation Method 3
stirring treatment is performed at a stirring speed of 2,200 r/min to 2,800 r/min
Implementation Method 4
performing wet granulation and drying
Data Source
Figure 1
AI summary
The present disclosure relates to the technical field of carbon black materials, and particularly to a granular carbon black and a preparation method therefor, an electrode and a secondary battery. For the granular carbon black, particle size distribution of the granular carbon black ranges as follows: a weight percent of granular carbon black with a particle diameter less than 0.125 mm is equal to or less than 2 %, a weight percent of granular carbon black with a particle diameter ranging from 0.125 to 0.85 mm is from 18 % to 60 %, and a weight percent of granular carbon black with a particle diameter more than 0.85 mm is from 40 % to 80 %; and a secondary particle diameter D50 of the granular carbon black ranges from 2.0 µm to 3.51 µm. The granular carbon black of the present disclosure has suitable particle size distribution, which not only reduces the pulverization phenomenon, but also can remarkably improve the bulk density and dispersibility, thus being conducive to giving full play to electrical conductivity and other performances.