Femtosecond Laser Machined Electrodes for Energy Storage
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Solution Overview
Problem
Current energy storage devices, such as batteries and capacitors, face limitations in capacity and size due to inadequate surface areas of electrodes, and traditional electromagnetic interference (EMI) shielding technologies are inefficient, failing to effectively manage heat and interference.
Innovation Solution
The use of femtosecond pulsed laser technology to machine surfaces, increasing their area significantly, and combining this with chemical vapor deposition of nano structures, enhances the surface area of electrodes and shielding materials, improving energy storage and EMI shielding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional electrode surfaces are used in energy storage devices, then device complexity remains low, but energy storage capacity is limited due to insufficient surface area
Solution Approach 1:
The patent transforms flat 2D electrode surfaces into 3D nanostructured surfaces with hierarchical architectures including nanowires, nanotubes, and porous networks. This dimensional transformation increases the effective surface area by factors of 10-100 times while maintaining the same footprint, thereby dramatically increasing energy storage capacity without proportionally increasing device volume
Solution Approach 2:
The patent employs porous electrode materials with controlled pore sizes and distributions to maximize surface area accessibility. The porous structures allow electrolyte penetration throughout the bulk material, ensuring that the increased surface area is fully utilized for energy storage while maintaining ion transport efficiency
2Object-affected harmful factors
If traditional EMI shielding materials are used, then device complexity remains simple, but EMI shielding effectiveness is insufficient and heat management is poor
Solution Approach 1:
The patent develops composite shielding materials combining conductive nanowires (such as silver, copper, or carbon nanotubes) embedded in polymer or metal matrixes. These composites provide both superior EMI shielding through enhanced electrical conductivity and improved heat dissipation through thermal conduction pathways, achieving multifunctional performance beyond traditional homogeneous shielding materials
Solution Approach 2:
The patent transitions from planar 2D shielding coatings to 3D hierarchical nanostructured surfaces with increased surface area and volumetric conductivity. The three-dimensional network structures provide more extensive electron pathways for EMI blocking and more efficient thermal conduction channels for heat management
3Area of stationary object
If conventional laser processing is used, then processing speed is moderate, but surface area enhancement is insufficient due to thermal damage and melting
Solution Approach 1:
The patent employs ultrashort pulsed laser processing where energy is delivered in femtosecond to picosecond pulses with sufficient interval between pulses to allow heat dissipation. This periodic energy delivery prevents cumulative thermal buildup, enabling precise ablation and nanostructure formation without melting or damaging surrounding material
Solution Approach 2:
The patent uses ultrashort laser pulses that deposit energy faster than thermal diffusion can occur, effectively 'skipping' through the thermal relaxation time scale. This allows direct ablation and phase transformation at the focal point before heat can spread to adjacent areas, achieving clean surface modification with minimal thermal zone
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 significantly enhanced energy storage capacities, reduced sizes of energy devices, and improved EMI shielding by up to 1,000 times, along with efficient heat management and interference protection.
Implementation Method 1
The activated carbon, metal and other charge storage surfaces are ablated by femtosecond pulsed lasers, increasing surface areas and storage capacity.
Implementation Method 2
Femtosecond pulse laser technology machined surface areas of the current collectors and electrodes makes both current collectors and electrodes with high surface areas.
Implementation Method 3
The femtosecond pulsed laser enhanced surfaces absorb and do not reflect incoming wave energy.
Implementation Method 4
the nano-machined surfaces reduce heat and facilitate element packing in the parts by improving heat radiation.
Data Source
AI summary
Electronic components and electrodes for transforming, storing and shielding devices have ablated femtosecond pulsed laser machined with developed nano structures for substantially increasing surface areas. Storage is multiplied in capacitors and supercapacitors, and small sizes have increased capacity. Supercapacitor heating upon charging and discharging is reduced by femtosecond pulsed laser ablation of inner and outer surfaces of cases. Battery storage capacity and charging time, fuel cell size and capacity, hydrogen generation and storage and seconds are improved by femtosecond pulsed laser machining ablation of electrode surfaces followed by chemical vapor deposition of carbon nano structures.