Composite Conductive Carbon Material for Battery Electrode Dispersibility
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Solution Overview
Problem
Existing conductive materials for secondary batteries, such as carbon nanotubes and graphene, face challenges with dispersibility and aggregation, limiting their effectiveness in maintaining electrolyte permeability and reducing electrode resistance.
Innovation Solution
A composite conductive material is developed by growing carbon nanofibers from the contact points of carbon particles penetrated by a catalyst, using cobalt and vanadium as catalysts, which enhances dispersibility and binding force, minimizing contact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon nanotubes or carbon nanofibers are used as conductive materials, then electrical conductivity is improved, but dispersibility deteriorates due to bundle-type growth and entanglement
Solution Approach 1:
The patent segments the conductive material into two distinct components: spherical carbon particles (5-500 nm diameter) that provide excellent dispersibility, and carbon nanofibers (10-100 nm diameter) grown on the particle surfaces that provide electrical conductivity. This segmentation allows each component to fulfill its optimal function without the drawbacks of bundle-type growth affecting dispersibility.
Solution Approach 2:
The patent creates a composite material system combining spherical carbon particles with surface-grown carbon nanofibers. The spherical particles act as a dispersible carrier while the nanofiber coating provides conductivity, achieving a synergistic effect where the composite exhibits both excellent dispersibility and electrical conductivity that neither component could achieve alone.
2Ease of operation
If carbon nanotubes are dispersed in a dispersion medium through ultrasonic treatment, then dispersibility is improved during treatment, but aggregation occurs after treatment when concentration increases
Solution Approach 1:
The patent performs preliminary action by growing carbon nanofibers directly on the spherical carbon particle surfaces before dispersal. This pre-formation of a controlled nanofiber coating prevents the aggregation that occurs when free carbon nanotubes are dispersed, as the nanofibers are already anchored to the spherical particles rather than being free to bundle together.
3Volume of stationary object
If high-density electrode is formed by high-pressure press, then electrode density is improved, but electrolyte permeability deteriorates due to particle deformation and reduced space between particles
Solution Approach 1:
The patent applies local quality by using carbon particles with specifically controlled properties (5-500 nm diameter, spherical shape, 0.05-0.20 g/cm³ density) that maintain their morphology under compression. The carbon nanofibers grown on the surface (10-100 nm diameter) create localized conductive pathways that do not require high pressure, allowing the electrode to achieve high density while preserving electrolyte permeability through the maintained micropore structure.
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 composite material improves dispersibility and conductivity, reducing electrode resistance and maintaining electrolyte permeability, while preventing dendrite formation and reducing costs through an omitted catalyst removal process.
Implementation Method 1
heat treating the catalyst in a helium or hydrogen atmosphere to penetrate the carbon particles
Implementation Method 2
growing carbon nanofibers from a contact point of the carbon particles and the catalyst by supplying and heating a source gas containing carbon
Implementation Method 3
carbon nanofibers formed by growing from a contact point of the carbon particles and a catalyst penetrated into the carbon particles
Data Source
Figure 1
AI summary
The present invention provides a method for producing a composite conductive material having excellent dispersibility, including: (S1) supporting a catalyst on carbon particles; (S2) heat treating the catalyst in a helium or hydrogen atmosphere to penetrate the carbon particles; and (S3) growing carbon nanofibers from a contact point of the carbon particles and the catalyst by supplying and heating a source gas containing a carbon source. The composite conductive material for a secondary battery according to the present invention has the effect of complementing the shortcomings of the highly dispersed carbon nanofibers of the highly conductive carbon nanofibers by synthesizing and growing the carbon nanofibers directly from spherical carbon particles having excellent dispersibility.