Composite Electrode Coating with Solvent-Free Radiation-Curable Binders
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Solution Overview
Problem
Conventional electrode manufacturing for electrochemical devices involves energy-intensive solvent evaporation and requires additional capital investment for VOC emission control, limiting manufacturing speed and solid loading capacity.
Innovation Solution
A solvent-free method involving the mixing of active material particles, radiation curable resin precursors, and electrically conductive particles, which are electrostatically sprayed onto a current collector, calendered, and cured using electron beam or ultraviolet radiation to form a cohesive and adhesive resin matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional slurry casting with solvent evaporation is used, then electrode coating can be formed, but energy consumption increases and manufacturing speed is limited
Solution Approach 1:
The patent removes the solvent component from the conventional slurry casting process, transitioning from a liquid slurry requiring evaporation to a dry powder mixture that is directly applied and sintered. This extraction of the solvent eliminates the energy-intensive evaporation step while maintaining the coating formation capability through alternative mechanisms (direct powder deposition and sintering).
Solution Approach 2:
The patent changes the physical state parameters of the coating material from liquid slurry to dry powder, and changes the processing temperature regime by replacing low-temperature evaporation with high-temperature sintering. This parameter transformation enables solvent-free processing that reduces overall energy consumption by eliminating the evaporation step.
2Ease of manufacture
If volatile organic compound solvent is used, then coating can be applied, but VOC emissions require recycling systems increasing capital investment
Solution Approach 1:
The patent extracts and eliminates the volatile organic compound solvent from the manufacturing process entirely, using dry powder mixing and direct deposition instead. This removal of the harmful solvent component eliminates the need for VOC recycling systems and associated capital investment, while still achieving the desired coating formation through sintering.
Solution Approach 2:
The patent converts the potential harm of solvent use (VOC emissions requiring complex recycling systems) into a benefit by adopting a solvent-free approach. The dry powder methodology not only eliminates emissions but also simplifies the overall manufacturing system, turning a harmful necessity into an advantageous choice.
3Loss of substance
If thermal drying is used after slurry coating, then solvent removal is achieved, but energy consumption and manufacturing time increase
Solution Approach 1:
The patent extracts the solvent removal step entirely from the process by not using solvent in the first place. Instead of coating with slurry and then removing solvent through thermal drying, the method directly applies dry powder mixture which is then sintered to form the cohesive coating, eliminating both the solvent removal operation and the associated time and energy consumption.
Solution Approach 2:
The patent performs the binding action preliminarily through sintering of the dry powder mixture, which directly forms the cohesive coating structure without requiring a subsequent drying step. The sintering process simultaneously achieves what conventional methods require in separate steps (coating formation and solvent removal), thereby reducing total manufacturing time.
4Quantity of substance
If high solid loading is achieved in aqueous slurry, then up to 80 wt% solid content is possible, but thermal drying is still required consuming energy and limiting speed
Solution Approach 1:
The patent extracts the solvent from the high solid loading slurry system, allowing for potentially higher solid content formulations without the constraint of requiring a liquid carrier. The dry powder approach enables maximum solid loading while eliminating the energy-intensive thermal drying step that would otherwise be necessary to remove the liquid phase.
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 method reduces energy consumption, eliminates VOC emissions, and increases manufacturing speed while achieving high solid loading and cohesive adhesion, enhancing the performance and efficiency of electrode production.
Implementation Method 1
cured using electron beam or ultraviolet radiation to form a cohesive and adhesive resin matrix
Implementation Method 2
electrostatically sprayed onto a current collector
Data Source
AI summary
A method of making an electrode includes the step of mixing active material particles, radiation curable resin precursors, and electrically conductive particles to create an electrode precursor mixture. The electrode precursor mixture is electrostatically sprayed onto a current collector to provide an electrode preform. The electrode preform is heated and calendered to melt the resin precursor such that the resin precursor surrounds the active particles and electrically conductive particles. Radiation is applied to the electrode preform sufficient to cure the radiation curable resin precursors into resin.