Graphite Particle Production from CO2 via Molten Salt Electrolysis
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Solution Overview
Problem
Existing methods for immobilizing carbon dioxide do not effectively produce graphite particles suitable for use as electrode materials, and the manufacturing of graphite particles is influenced by carbon precursor binders.
Innovation Solution
A method involving the generation of carbon particles through electric discharge in a molten salt bath containing carbonate ions, followed by heat treatment to produce graphite particles without the need for binders, utilizing carbon dioxide as a raw material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If carbon dioxide is used as a raw material for manufacturing graphite particles through existing immobilization methods, then carbon recycling is achieved, but the graphite particles cannot be used as electrode materials due to lack of required functionality
Solution Approach 1:
The patent applies parameter changes by controlling the heat treatment temperature (2000-3000°C) and atmosphere to transform the carbon structure from amorphous to graphitic, achieving the required crystallinity and functional properties for electrode materials while using CO2 as the carbon source
Solution Approach 2:
The patent creates composite structures by forming graphite particles with specific crystalline phases and morphologies through controlled electrolysis and heat treatment, resulting in materials that combine the carbon source from CO2 with the functional properties of electrode-grade graphite
2Ease of manufacture
If carbon precursor binders are used in the manufacturing process of graphite particles, then the particles can be formed and processed, but the graphite particles receive unwanted influence from binder components
Solution Approach 1:
The patent extracts and eliminates the binder component from the manufacturing process entirely, using only carbonaceous raw materials that are electrolyzed to form carbon particles, thereby avoiding all binder-related impurities while maintaining particle formation capability
Solution Approach 2:
The patent employs a self-service approach where the carbonaceous raw material itself serves as both the structural precursor and the carbon source, eliminating the need for separate binders by using materials that can be directly converted to carbon particles through electrolysis
3Productivity
If conventional graphite particle manufacturing methods are used, then graphite powder can be produced, but the process is complex and time-consuming involving multiple steps including melting, mixing, pressing, and pulverizing
Solution Approach 1:
The patent replaces mechanical processes (melting, mixing, pressing, pulverizing) with electrochemical electrolysis that directly converts carbonaceous raw materials into carbon particles suspended in molten salt, significantly simplifying the manufacturing流程 and improving efficiency
Solution Approach 2:
The patent utilizes phase transitions of the electrolyte (melting point control) and the carbon particles (formation and suspension in molten salt) to enable a simplified one-step electrolysis process that replaces multiple conventional manufacturing steps
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
This method enables the production of graphite particles with specific properties suitable for electrode materials, such as controlled interplanar spacing, particle size, and surface area, while avoiding binder-related impurities.
Implementation Method 1
reducing the carbonate ions by generating electric discharge between the cathode and the surface of the electrolytic bath and performing energization by applying a voltage for generating carbon particles between the anode and the cathode
Implementation Method 2
reducing the carbonate ions by generating electric discharge between the cathode and the surface of the electrolytic bath
Implementation Method 3
a step of graphitizing the carbon particles obtained in (e) the step by heat treatment
Data Source
AI summary
Provided is a method for manufacturing graphite particles using carbon dioxide as a raw material and which enables the graphite particles to be used as an electrode material.The method includes: (a) preparing an electrolytic bath which includes molten salt containing carbonate ions; (b) locating a cathode in a vicinity of a surface of the electrolytic bath outside the electrolytic bath; (c) locating an anode in the electrolytic bath; (d) reducing the carbonate ions by generating electric discharge between the cathode and the surface of the electrolytic bath and performing energization by applying a voltage for generating carbon particles between the anode and the cathode; (e) collecting the carbon particles together with the molten salt and removing cooled and solidified salt by water washing; and (f) graphitizing the carbon particles being obtained in (e) by heat treatment.