Carbon Particles with High Oxygen Content for Electrochemical Applications
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The capacitive performance of carbon spheres in electrochemical applications is limited, restricting the energy density of batteries, and traditional activated carbons with low oxygen content face issues of high leakage currents and reduced conductivity.
Innovation Solution
The method involves hydrothermal synthesis of carbon particles from carbohydrate precursors, followed by chemical and physical activation, resulting in carbon particles with a unique combination of high oxygen content and low leakage currents, enhancing their suitability for electrochemical applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional activated carbons with low oxygen content are used, then manufacturing simplicity is maintained, but leakage currents increase and conductivity decreases
Solution Approach 1:
The patent changes the oxygen content parameter from traditional low levels to high levels (5-30% by weight) in carbon particles prepared from carbohydrate precursors. This parameter change simultaneously reduces leakage currents and improves conductivity, resolving the contradiction between reliability and harmful factors.
Solution Approach 2:
The patent converts the typically harmful effect of oxygen in carbon structures (which usually creates defects and reduces conductivity) into a beneficial feature. By deliberately introducing high oxygen content through hydrothermal synthesis from carbohydrate precursors, the patent achieves reduced leakage currents and improved conductivity, turning what is normally a detrimental factor into an advantage.
2Reliability
If carbon spheres are activated with potassium hydroxide, then capacitive performance is improved, but energy density is limited
Solution Approach 1:
The patent changes the preparation method parameter from conventional chemical activation with potassium hydroxide to hydrothermal synthesis from carbohydrate precursors. This produces carbon particles with high oxygen content (5-30% by weight) that achieve high capacitive performance while maintaining high energy density, resolving the contradiction between capacitive performance and energy density.
3Object-generated harmful factors
If carbon particles with high oxygen content are produced, then leakage currents are reduced, but manufacturing complexity increases
Solution Approach 1:
The patent employs hydrothermal synthesis where carbohydrate precursors (such as sugars or starches) self-organize and carbonize under controlled hydrothermal conditions to form carbon particles with high oxygen content. The process utilizes the inherent properties of the carbohydrate precursors to self-assemble into the desired carbon structure with beneficial oxygen functionality, reducing the need for complex post-synthesis treatments and simplifying manufacturing while achieving low leakage currents.
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 approach yields carbon particles with improved gravimetric and volumetric capacitance, maintaining charge for longer periods and enabling higher power delivery, contrary to traditional activated carbons, with controlled particle size and microstructure for various electrochemical applications.
Implementation Method 1
The precursor solution is placed in a pressure vessel. The pressure vessel is heated to a reaction temperature to form carbon particles.
Implementation Method 2
The carbon particles are subjected to a chemical activation and a physical activation.
Implementation Method 3
The carbon particles are subjected to a chemical activation and a physical activation.
Data Source
AI summary
A composition generally includes carbon particles. The particles are prepared by dissolving a carbohydrate-based precursor in water to form a precursor solution and placing the precursor solution in a pressure vessel. The precursor solution is placed in a pressure vessel. The pressure vessel is heated to a reaction temperature to form carbon particles. The carbon particles are subjected to a chemical activation and a physical activation. The composition includes, by weight, about 5% to about 30% oxygen.