Graphite Composite Structure for Vertical Conductivity
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Solution Overview
Problem
Current methods fail to mass-produce textured graphite materials with high conductivity in the vertical direction, and materials with multiple excellent characteristics are costly and complex to produce.
Innovation Solution
A method involving the formation of an amorphous carbon layer with a short-range ordered structure, application of local forces to create stressed regions, and an annealing process to form long-range ordered graphite structures with specific plane orientations, resulting in a graphite composite structure with improved conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If textured graphite materials are produced using conventional methods, then directional transmission capability and conductivity are improved, but mass production capability and manufacturing complexity are worsened
Solution Approach 1:
The invention changes the manufacturing parameters by controlling annealing temperature (400-2000°C) and applying specific stress conditions during carbonization to transform amorphous carbon into textured graphite with desired crystal orientation. This parameter control enables mass production while maintaining high conductivity and directional transmission capability.
Solution Approach 2:
The invention applies local stress to specific regions of the amorphous carbon layer during the carbonization process, creating textured graphite structures with specific crystal orientations in targeted areas. This local quality approach allows for controlled production of conductive pathways where needed while simplifying overall manufacturing.
2Reliability
If materials with multiple excellent characteristics are produced, then performance is improved, but production cost and complexity are worsened
Solution Approach 1:
The invention creates a composite structure consisting of amorphous carbon regions and textured graphite regions within the same layer. This composite material approach enables the simultaneous achievement of multiple characteristics (high conductivity, directional transmission, and structural flexibility) through a single integrated manufacturing process, reducing production complexity.
Solution Approach 2:
By adjusting annealing temperature and stress application parameters, the invention can control the extent and distribution of graphite crystallization within the carbon layer, enabling tailoring of multiple properties simultaneously without requiring separate processing steps for each characteristic.
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 method enables the production of graphite composite structures with resistivity in the range of 1×10−5 to 1×10−4 Ω·cm, suitable for high-power lithium-ion battery electrodes and interconnection in electronic devices, offering enhanced conductivity and directional transmission capabilities.
Implementation Method 1
An annealing process is performed on the amorphous carbon layer so as to form at least one long-range ordered graphite structure in the at least one stressed region
Data Source
AI summary
A method of fabricating a graphite composite structure includes the following steps. An amorphous carbon layer having a short-range ordered structure region in a range from 50% to 100% is provided. At least one force is locally applied on a surface of the amorphous carbon layer to form at least one stressed region. An annealing process is performed on the amorphous carbon layer so as to form at least one long-range ordered graphite structure in the at least one stressed region. The at least one long-range ordered graphite structure includes a stack structure including a plurality of (002) planes. An angle between an extension direction of the (002) planes and the surface of the amorphous carbon layer is in a range from 45 degrees or more to 90 degrees or less.