Conductive Carbon Black Surface Area Control via Pyrolysis
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Solution Overview
Problem
Conductive carbon black particles with smaller particle sizes tend to agglomerate and mix unevenly, affecting the performance of composite materials, particularly in the lithium battery industry, where a specific surface area between 40 and 80 m^2/g is required for optimal performance.
Innovation Solution
A production method involving a pyrolysis reaction of acetylene mixed with hydrocarbon raw materials at a temperature of 1300 to 1500 °C, using aromatic hydrocarbons, olefins, or natural gas to control the specific surface area of conductive carbon black, and a material delivering device to ensure uniform mixing and temperature distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acetylene is pyrolyzed at 1800°C to produce conductive carbon black with high specific surface area (80 m²/g), then electrical conductivity is improved, but particle size becomes too small causing agglomeration and uneven mixing
Solution Approach 1:
The patent changes the pyrolysis temperature parameter from the conventional 1800°C down to 1300-1500°C, and adjusts the raw material composition by mixing acetylene with hydrocarbon raw materials. This parameter change produces carbon black particles with specific surface area of 40-80 m²/g that have better dispersion properties and reduced agglomeration, while still maintaining the required electrical conductivity for lithium battery applications.
2Stability of the object's composition
If pyrolysis temperature is reduced to 1300-1500°C to control specific surface area between 40-80 m²/g, then particle dispersion is improved, but production efficiency may be affected
Solution Approach 1:
The patent performs preliminary mixing of acetylene with hydrocarbon raw materials before pyrolysis, and uses a material delivering device to pre-establish uniform distribution of reactants. This preliminary action ensures that when pyrolysis occurs at the lower temperature of 1300-1500°C, the reaction proceeds efficiently with consistent product quality, maintaining production efficiency while achieving the desired particle size control.
3Reliability
If pure acetylene is used for pyrolysis, then high specific surface area (80 m²/g) is achieved, but specific surface area cannot be controlled within the 40-80 m²/g range required for lithium batteries
Solution Approach 1:
The patent uses a composite raw material system consisting of acetylene mixed with hydrocarbon raw materials (such as methane, ethylene, propylene, or butadiene). This composite approach allows control of the pyrolysis process to produce carbon black with specific surface area within the 40-80 m²/g range, providing adaptability for lithium battery applications while maintaining high electrical conductivity.
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 effectively produces conductive carbon black with a specific surface area of 40 to 80 m^2/g, ensuring uniform particle distribution and improved performance in lithium battery applications by stabilizing the pyrolysis temperature and mixing process.
Implementation Method 1
making acetylene mixed with a hydrocarbon raw material undergo a pyrolysis reaction at 1300 to 1500 °C
Data Source
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AI summary
Disclosed are a production method for efficiently controlling a specific surface area of conductive carbon black, and a material delivering device, which relate to the technical field of preparation of conductive carbon black. The production method for efficiently controlling a specific surface area of conductive carbon black includes making acetylene mixed with a hydrocarbon raw material undergo a pyrolysis reaction at 1300 to 1500 °C, wherein the hydrocarbon raw material includes one, or a combination of more than one, of hydrocarbon compounds. When acetylene is introduced to undergo a pyrolysis reaction at 1800 °C, conductive carbon black is obtained with a specific surface area of generally 80 m2/g or more. When acetylene is mixed with a hydrocarbon raw material so that the temperature of the pyrolysis reaction is reduced to 1300 to 1500 °C, conductive carbon black is obtained with a specific surface area of substantially from 40 to 80 m2/g by controlling the pyrolysis temperature.