Porous Carbon Skeleton for Silicon-Carbon Electrode Modulus Balance
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Solution Overview
Problem
Porous carbon materials face challenges in balancing specific surface area, pore volume, and particle elastic modulus performance, making it difficult to achieve high tenacity and uniform pore size distribution suitable for electrochemical applications.
Innovation Solution
A porous carbon material composed of carbon nanotubes and carbon material particles with a particle elastic modulus between 0.9 GPa and 5.0 GPa, prepared through a method involving mixing carbon nanotubes with a carbon precursor and a curing agent, followed by programmed curing, carbonization, and activation treatments, to achieve a high specific surface area and uniform pore size distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If porous carbon material is prepared with high specific surface area and pore volume, then adsorption performance is improved, but particle elastic modulus decreases
Solution Approach 1:
The patent combines carbon nanotubes with carbon material particles to form a composite porous carbon material. The carbon nanotubes serve as a reinforcing phase that enhances the particle elastic modulus while the carbon material particles provide the porous structure for high specific surface area and pore volume, thus resolving the contradiction between strength and adsorption performance
Solution Approach 2:
The patent creates a heterogeneous structure where carbon nanotubes are distributed within the carbon material particles, providing localized reinforcement. The carbon nanotubes concentrate strength-enhancing properties in specific regions while the overall porous structure maintains high specific surface area, allowing different parts of the material to fulfill different functions
2Manufacturing precision
If porous carbon material is prepared with uniform pore size distribution, then adsorption selectivity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent controls the pore size distribution by adjusting preparation parameters including carbonization temperature (900-1300°C), activation temperature (900-1000°C), and activation time (10-14 hours). These parameter changes enable precise control over pore formation during activation, achieving uniform pore size distribution without requiring overly complex manufacturing processes
Solution Approach 2:
The patent utilizes the inherent porosity development during carbonization and activation processes, where controlled pore formation occurs through thermal treatment and chemical activation. This approach leverages the self-organizing nature of porous structure formation during processing, achieving uniform pore distribution through thermodynamic control rather than mechanical fabrication
3Strength
If carbon nanotube content is increased to enhance particle elastic modulus, then powder conductivity improves, but specific surface area decreases
Solution Approach 1:
The patent applies partial action by adding carbon nanotubes at a controlled concentration (1-6% by mass) rather than excessive amounts. This optimized dosage provides sufficient reinforcement to improve particle elastic modulus and powder conductivity while minimizing the impact on specific surface area, achieving a balanced composition that satisfies multiple performance requirements simultaneously
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 resulting porous carbon material exhibits improved particle elastic modulus, powder conductivity, and electrochemical performance, enhancing the long cycling and rate performance of electrochemical apparatuses.
Implementation Method 1
increasing temperature to a first reaction temperature T1 in a first protective atmosphere to perform programmed curing treatment
Implementation Method 2
performing carbonization treatment on the mixed precursor in a second protective atmosphere at a second reaction temperature T2
Implementation Method 3
activation treatment in a third protective atmosphere at a third reaction temperature T3
Data Source
Figure 1A~1B
Figure 2~3
Figure 4~5
AI summary
A porous carbon material includes carbon nanotubes and carbon material particles, a particle elastic modulus of the porous carbon material is Y1, and 0.9 Gpa≤Y1≤5.0 Gpa. The porous carbon material of this application has a high particle elastic modulus and a high powder conductivity. When a silicon-carbon material prepared using the porous carbon material in this application as a skeleton is used in an electrochemical apparatus, the silicon-carbon material can have a high particle elastic modulus and powder conductivity, improving the electrochemical performance of the electrochemical apparatus such as the long cycling performance and rate performance.