Laser-Structured Battery Electrodes Without Solvent Drying
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Solution Overview
Problem
Existing lithium-ion battery (LIB) manufacturing processes are costly, energy-intensive, and environmentally hazardous due to the use of solvents like N-Methylpyrrolidone, and struggle to balance energy and power densities in electrode design.
Innovation Solution
A solvent-free laser powder-bed fusion (L-PBF) process using a laser to selectively sinter a dry powder mixture of active materials and binders on a metal substrate, followed by removing unsintered powder, enabling structured electrodes with enhanced Li+ transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solvent-based tape casting is used for electrode manufacturing, then manufacturing process is established and scalable, but manufacturing cost increases and energy consumption rises due to long drying times and solvent recovery requirements
Solution Approach 1:
The invention extracts and eliminates the solvent component from the traditional tape casting process. By using a dry powder mixture instead of a slurry requiring solvents like NMP, the process removes the need for energy-intensive drying and solvent recovery operations, directly reducing energy consumption while maintaining manufacturability
Solution Approach 2:
The invention changes the physical state parameter of the electrode material from a wet slurry (requiring drying) to a dry powder form. This parameter change eliminates the solvent phase entirely, transforming the manufacturing process from one requiring thermal energy for evaporation to a cold or low-temperature process
2Ease of manufacture
If solvent-based tape casting is used for electrode manufacturing, then electrode structure can be formed, but manufacturing cost increases due to expensive solvent recovery and safety protocols
Solution Approach 1:
The invention extracts and eliminates the toxic solvent (NMP) from the manufacturing process. By using a dry powder mixture with binder and conductive additive, it removes the need for expensive solvent recovery systems and safety infrastructure, directly reducing manufacturing costs while maintaining electrode structure formation capability
Solution Approach 2:
The invention replaces expensive, hazardous solvents that require recovery and special handling with inexpensive, non-hazardous dry powder materials. The dry powder mixture can be directly processed without recovery systems, eliminating capital and operational expenses associated with solvent management
3Quantity of substance
If electrode thickness is increased to improve energy density, then energy density increases, but power density decreases due to reduced ionic and electronic transport
Solution Approach 1:
The invention segments the electrode structure into a hierarchical architecture with macro-scale thickness for energy storage and micro-scale conductive networks for rapid transport. The 3D printed structure creates interconnected channels and porous pathways that allow ions and electrons to travel efficiently through thick electrodes, decoupling energy density from power density
Solution Approach 2:
The invention transitions from 2D planar electrodes to 3D structured electrodes with vertical and lateral transport pathways. This dimensional change creates multiple transport routes through the electrode thickness, enabling simultaneous high energy density (thick electrodes) and high power density (short transport paths via 3D channels)
4Shape
If structured electrodes are manufactured using traditional methods, then some structure can be achieved, but manufacturing cost increases and scalability is limited
Solution Approach 1:
The invention uses a universal 3D printing platform that can manufacture various structured electrode geometries without requiring different equipment or processes. The same additive manufacturing system can create different patterns, thicknesses, and architectures, providing versatility while maintaining cost-effectiveness and scalability
Solution Approach 2:
The invention replaces complex mechanical structuring operations (such as laser drilling, casting head designs, or post-processing steps) with a single additive manufacturing process. The 3D printer directly creates the final structured geometry in one step, eliminating multiple manufacturing stages and reducing overall complexity and cost
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 process reduces manufacturing costs and energy consumption, enhances scalability, and improves energy and power densities by eliminating solvents, while preserving the crystalline structure and adhesion of active materials.
Implementation Method 1
A laser is configured to generate a laser beam to selectively sinter portions, or all, of the powder layer
Implementation Method 2
The laser is configured to generate a laser beam to selectively sinter portions, or all, of the powder layer
Implementation Method 3
The electrostatic spray gun applies a dry powder mixture which forms a dry powder layer on the planar metal substrate
Data Source
AI summary
The present disclosure relates to a system for making an electrically conductive battery component. The system uses a metal layer forming a planar metal substrate, and a powder deposition component for applying a powder to form a powder layer on the planar metal substrate. A laser is used and configured to generate a laser beam to selectively sinter portions, or all, of the powder layer using a predetermined beam scanning pattern. A subsystem is used to remove portions of the powder layer that are not sintered by the laser to leave a planar finished material layer.