Microporous Carbon Production With High-Temperature Fluidization
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Solution Overview
Problem
Existing methods for manufacturing microporous carbon material for energy storage applications face challenges as pore size increases with synthesis temperature, affecting volumetric capacity, despite higher temperatures enhancing reaction speed and productivity.
Innovation Solution
A method involving fluidizing metal carbide material in a halogen gas at 800° C to 1300° C, followed by treatment under vacuum and hydrogen gas, and comminution to specific particle sizes, to produce microporous carbon material with controlled pore structure suitable for energy storage applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher synthesis temperature is used, then reaction speed and productivity increase, but pore size increases which reduces volumetric capacity
Solution Approach 1:
The synthesis process is divided into multiple sequential steps with different temperature regimes: an initial carbonization step at high temperature (2000-3000°C) to form the carbon structure, followed by a controlled expansion step at lower temperature (400-1000°C) with controlled atmosphere to develop micropores while maintaining small pore sizes. This segmentation allows each step to optimize for its specific function without the conflicting requirements present in single-step processes.
Solution Approach 2:
The precursor material is pre-prepared with specific properties (particle size, composition, structure) before the main synthesis process. The precursor is designed to contain carbon-rich components that will form the desired microporous structure during the controlled heating process, ensuring that the final product achieves small pore sizes with high volumetric capacity without requiring excessively high synthesis temperatures.
2Productivity
If higher synthesis temperature is used, then productivity increases, but volumetric capacity decreases due to increased pore size
Solution Approach 1:
The process employs precise control of multiple parameters including temperature profiles (with specific heating rates and holding times), atmosphere composition (ratio of inert to reactive gases), pressure conditions, and precursor material characteristics. By optimizing these parameters within specific ranges, the process achieves high productivity while maintaining small pore sizes that provide high volumetric capacity for energy storage applications.
3Ease of manufacture
If conventional manufacturing process is used, then production is simpler, but pore size increases affecting energy storage performance
Solution Approach 1:
The synthesis process operates as a continuous operation where precursor material is continuously fed, heated, and processed through the reactor system. The controlled atmosphere is maintained continuously throughout the synthesis period, ensuring consistent micropore formation. This continuous operation simplifies manufacturing compared to batch processes while maintaining precise control over pore size through sustained optimal conditions.
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 maintains small pore sizes, enhancing volumetric capacity and productivity, producing microporous carbon material with a balanced pore structure for supercapacitors and secondary batteries, while reducing the risk of undesirable surface bonds.
Implementation Method 1
fluidizing a granular metal carbide material by means of a halogen gas or a gas mixture containing a halogen gas at a temperature from 800° C. to 1300° C.
Implementation Method 2
fluidizing a granular metal carbide material by means of a halogen gas or a gas mixture containing a halogen gas at a temperature from 800° C. to 1300° C.
Implementation Method 3
maintaining the product obtained in step a) at a temperature from 150° C. to at most 250° C., both inclusive, and under vacuum at a pressure from 1 mbar to 300 mbar, both inclusive
Implementation Method 4
maintaining under an atmosphere of hydrogen gas or of a gas mixture containing at least 30% by volume of hydrogen based on the total volume of the gas mixture, at a temperature of from 800° C. to 1300° C.
Data Source
AI summary
Processes for the production of microporous carbon material, for use in electrodes of supercapacitors and secondary batteries, in which particulate metal carbide material is fluidized with a halogen gas at a high temperature in a fluidized bed reactor, the halogen gas is desorbed at a lower temperature of 150° C. to at most 250° C. under vacuum, and then the material is passivated using hydrogen gas and then milled.