CNT-Reinforced Porous Carbon for High-Modulus Silicon-Carbon Materials
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Solution Overview
Problem
Porous carbon materials face challenges in balancing specific surface area, pore volume characteristics, and particle elastic modulus performance, making it difficult to achieve optimal properties for applications such as electrochemical apparatuses.
Innovation Solution
A porous carbon material is developed incorporating carbon nanotubes and carbon material particles, with a particle elastic modulus of 0.9 GPa to 5.0 GPa, and a specific surface area of 1300 m2/g to 2800 m2/g, achieved through a preparation method involving mixing carbon nanotubes with a carbon precursor and curing agent, followed by programmed curing and activation treatments.
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 (0.005-0.05 μm diameter) serve as reinforcing elements that enhance the particle elastic modulus (0.9-5.0 GPa) while the carbon material particles provide the porous structure with high specific surface area (1300-2800 m2/g). This composite approach allows simultaneous achievement of mechanical strength and adsorption performance.
2Volume of stationary object
If porous carbon material structure is optimized for adsorption, then pore volume increases, but manufacturing complexity increases
Solution Approach 1:
The patent employs a multi-step preparation process including mixing carbon nanotubes with carbon material precursor and curing agent, programmed curing treatment, carbonization, and activation treatment. This systematic approach creates controlled porous structures with total pore volume 0.5-2.0 cc/g and uniform pore size distribution, achieving high pore volume while maintaining manageable manufacturing complexity through standardized process 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
The resulting porous carbon material exhibits high particle elastic modulus, powder conductivity, and uniform pore size distribution, enhancing the electrochemical performance of silicon-carbon materials in terms of long cycling and rate performance.
Implementation Method 1
mixing carbon nanotubes, a carbon material precursor, and a curing agent uniformly at a preset mass percentage and increasing temperature to a first reaction temperature T1 in a first protective atmosphere to perform programmed curing treatment
Implementation Method 2
The porous material is a type of material with a network structure composed of interconnected or closed pores, featuring strong adsorption
Implementation Method 3
performing carbonization treatment on the mixed precursor in a second protective atmosphere at a second reaction temperature T2 to obtain a carbonized pre-treatment material
Implementation Method 4
crushing and sieving the carbonized pre-treatment material, followed by activation treatment in a third protective atmosphere at a third reaction temperature T3, to obtain a porous carbon material
Data Source
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.