Graphene Deposition on Battery Substrates via Friction
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Solution Overview
Problem
Conventional methods for enhancing electrical conductivity in lithium ion battery electrodes, such as using carbon black, face challenges like inadequate bonding of graphene layers to the substrate material, leading to poor adherence and increased surface area, which affects the material's performance.
Innovation Solution
A method involving mechanical mechanisms, like friction-based techniques, to directly deposit graphene layers on substrate materials within an enclosed container, eliminating the need for exfoliation, solvents, and post-processing, ensuring effective bonding and adherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If graphene is incorporated with metal oxides in solution using conventional techniques, then the surface area of the material increases, but the graphene layers do not adequately bond to the substrate material leading to poor adherence
Solution Approach 1:
The patent replaces the chemical solution-based incorporation method with a mechanical friction-based direct deposition method. By using friction between graphite material and substrate during container motion, graphene is directly deposited onto the substrate surface without requiring solution processing, thereby ensuring proper bonding while increasing surface area
Solution Approach 2:
The patent uses friction as an intermediary mechanism to transfer graphene from graphite material to the substrate surface. The friction-based mechanical interaction serves as the mediator that enables direct deposition and bonding of graphene layers to the substrate without requiring chemical surfactants or solution processing
2Reliability
If carbon black is added to enhance electrical conductivity through slurry formation, then electrical conductivity is improved, but the carbon black cannot penetrate to all places of the material especially when particles are small or mesoporous
Solution Approach 1:
The patent replaces the slurry formation process with a mechanical friction-based direct deposition method. This allows graphene to be directly deposited onto the substrate surface through friction during container motion, enabling penetration into small particles and mesoporous structures that slurry formation cannot reach
Solution Approach 2:
The patent extracts the binder from the process by eliminating slurry formation entirely. By using direct friction-based deposition, the method avoids the presence of binder that prevents carbon black from contacting the substrate material, allowing graphene to directly bond to all surfaces including those in small particles and mesoporous structures
3Area of stationary object
If high surface area graphene layers are deposited on substrate material, then surface area increases, but the graphene may curve and form nanotubes that cannot form proper bonding to the substrate
Solution Approach 1:
The patent uses mechanical friction-based direct deposition instead of solution processing to deposit graphene. The friction mechanism ensures that graphene layers are deposited in a controlled manner that prevents curling and nanotube formation, while maintaining proper bonding to the substrate surface
Solution Approach 2:
The friction-based mechanical process allows the graphene to self-align and bond to the substrate surface during the deposition process. The mechanical interaction between graphite and substrate during container motion enables spontaneous formation of well-bonded graphene layers without requiring additional processing 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
This approach results in improved electrical conductivity and enhanced material performance by ensuring contiguous graphene layers on the substrate, reducing surface resistance and increasing material capacity without increasing the surface area, thus addressing the limitations of conventional methods.
Implementation Method 1
A method involving mechanical mechanisms, like friction-based techniques, to directly deposit graphene layers on substrate materials
Data Source
AI summary
In one embodiment, a method comprising causing motion of an enclosed container comprising substrate material and graphite material within the container; and coating surfaces of the substrate material with the graphite material responsive to the motion of the container, the coated surfaces comprising graphene or graphene layers.