CNT-Copper Composite Conductors With Internal Copper Networks
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Solution Overview
Problem
Conventional copper and aluminum conductors face limitations in electrical conductivity, current carrying capacity, tensile strength, and environmental stability, particularly in high-tension power transmission and miniaturized electronic devices, while existing carbon nanotube-copper composites suffer from significant tensile strength loss and require complex plating processes.
Innovation Solution
A composite conductor material is developed with copper particles embedded within a non-metallic conductive porous matrix, such as CNT fabric, using a controlled aqueous acidic/basic electrodeposition process to form a copper network inside the matrix, enhancing ampacity and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional copper or aluminum conductors are used to achieve high electrical conductivity and current carrying capacity, then electrical performance is improved, but weight increases and environmental stability deteriorates
Solution Approach 1:
The patent employs a composite structure combining carbon nanotubes (providing mechanical strength and lightweight properties) with copper particles (providing electrical conductivity). This composite approach allows the conductor to achieve both lightweight characteristics and high electrical performance, resolving the contradiction between weight reduction and maintaining electrical functionality.
Solution Approach 2:
The invention distributes copper particles selectively within the carbon nanotube matrix, creating local conductive pathways where needed while maintaining the overall lightweight structure. This localized copper distribution optimizes electrical conductivity without requiring bulk copper, thus reducing overall weight while maintaining environmental stability.
2Reliability
If copper coating thickness is increased in CNT-Cu composites to improve electrical conductivity, then ampacity is improved, but tensile strength decreases significantly
Solution Approach 1:
The patent optimizes copper distribution by placing copper particles primarily at the intersections and contact points of carbon nanotubes rather than uniformly coating all surfaces. This localized copper placement provides sufficient electrical pathways for high conductivity while minimizing copper quantity, thereby preserving the tensile strength of the carbon nanotube structure.
Solution Approach 2:
The composite maintains a porous structure with copper particles distributed within the carbon nanotube network. This porous architecture allows the carbon nanotubes to retain their structural integrity and mechanical strength while providing adequate copper content for electrical conductivity, avoiding the need for thick continuous copper coatings that would compromise tensile strength.
3Manufacturing precision
If two-stage nucleation-growth electrodeposition is used to fill CNT mesoporous structures, then copper distribution is improved, but process complexity increases
Solution Approach 1:
The patent combines the nucleation and growth stages of copper deposition into a single electrodeposition process. By optimizing electrolyte composition and deposition parameters, the process achieves uniform copper distribution throughout the CNT mesoporous structures in one step, eliminating the need for separate nucleation and growth stages while maintaining manufacturing precision.
Solution Approach 2:
The invention modifies electrodeposition parameters such as electrolyte composition, pH, temperature, and current density to enable single-step copper infiltration into CNT structures. These parameter optimizations allow copper to naturally distribute uniformly throughout the porous network during a single deposition process, achieving the same result as two-stage processes but with reduced complexity.
4Weight of moving object
If carbon nanotube composites are used to reduce weight, then mass is reduced, but electrical conductivity and current carrying capacity deteriorate
Solution Approach 1:
The patent creates a hybrid composite where carbon nanotubes provide the lightweight framework and copper particles provide the electrical conductivity. This synergistic combination allows the material to achieve electrical performance comparable to or exceeding pure copper while maintaining a fraction of the weight, as the carbon nanotube structure is significantly lighter than bulk metal.
Solution Approach 2:
The invention transitions from traditional bulk metal conductors to a hierarchical structure where copper particles are distributed throughout the three-dimensional carbon nanotube network. This dimensional reorganization creates efficient electrical pathways through the lightweight CNT framework, achieving high conductivity without requiring dense metal structures.
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 conductor exhibits significantly higher electrical conductivity and current carrying capacity, lower mass, and improved environmental stability, making it suitable for lightweight power transmission systems and electronic applications.
Implementation Method 1
electrodeposition of a metal such as copper over CNT fibers
Implementation Method 2
the nucleation of Cu on the CNT surface is conducted by dipping the hydrophobic CNT fibers in organic solution containing Cu ions and electrodeposition of Cu seed layer
Implementation Method 3
Cu seeds growth was progressed in the aqueous copper sulfate solution until complete filling of the CNT fiber mesoporous structures
Implementation Method 4
The formed CNT-Cu composite than experiences annealing in hydrogen ambient in order to improve its electrical conductivity
Data Source
AI summary
Provided herein are composite conductors, characterized by having copper deposits inside the bulk rather than on the outer surface of a non-metallic conductive porous matrix, such as CNT fabric, as well as a process for obtaining the same. The composite conductors provided herein are also characterized by a low specific weight and a high ampacity compared to metal conductors of similar size and shape.