UHMWPE Dry Electrode Binder for High-Loading Battery Electrodes
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Solution Overview
Problem
The existing wet process for producing lithium-ion battery electrodes requires hazardous solvents and large ovens, leading to environmental impact and high costs, while the dry electrode process lacks viable binders for scalable and efficient production.
Innovation Solution
The use of ultra-high molecular weight polyethylene (UHMWPE) particles with specific characteristics, such as high molecular weight and low entanglement, to form fibrils that durably enmesh filler particles, enabling a solvent-free dry electrode process for producing highly loaded articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the wet process is used to produce lithium-ion battery electrodes, then the electrodes can be manufactured with established methodology, but hazardous solvents and large ovens are required leading to environmental impact and high costs
Solution Approach 1:
The patent extracts and eliminates the harmful liquid processing aids (solvents) from the electrode manufacturing process. By transitioning from a wet process requiring solvents like NMP to a dry process using only particulate binder materials, the invention removes the source of environmental harm while maintaining manufacturability through alternative binding mechanisms.
Solution Approach 2:
The invention changes the physical state parameter of the processing medium from liquid (wet process) to solid particulate form (dry process). This parameter change eliminates the need for hazardous solvents and large drying ovens, reducing environmental impact while preserving the ability to manufacture electrodes through a fundamentally different but equally effective methodology.
2Ease of manufacture
If the wet process is used to produce lithium-ion battery electrodes, then the electrodes can be manufactured with established methodology, but large ovens are required leading to high production costs
Solution Approach 1:
The patent extracts and eliminates the energy-intensive large drying ovens from the manufacturing process. By removing the liquid processing aids that require thermal drying, the invention eliminates the need for massive oven equipment and the associated high energy consumption and production costs.
Solution Approach 2:
By changing the processing medium from liquid to solid particulate form, the invention fundamentally alters the energy requirements of the process. The dry process using particulate binder materials requires minimal thermal energy input compared to the wet process that demands large ovens for solvent evaporation, thereby reducing production costs.
3Object-affected harmful factors
If a dry electrode process is used, then solvent-free processing is achieved reducing environmental impact, but viable binders for scalable production are lacking
Solution Approach 1:
The patent introduces particulate binder materials as intermediary substances that enable the dry electrode process to achieve scalable production. These solid particulate binders act as mediators between the active materials and current collector, providing the necessary binding function without requiring liquid solvents, thus maintaining environmental benefits while enabling industrial scalability.
Solution Approach 2:
The invention changes the functional form of binder materials from dissolved liquid state to solid particulate state. This parameter change enables the binder to perform its binding function through mechanical interlocking and adhesion in the dry process, making scalable production viable while preserving the environmental advantages of solvent-free processing.
4Productivity
If high filler loading is achieved in dry electrode articles, then production efficiency increases, but the structural integrity and strength of the electrode may be compromised
Solution Approach 1:
The patent applies local quality by using particulate binder materials strategically distributed throughout the electrode structure to provide binding function only where needed between active material particles and current collector. This localized binding approach allows high filler loading in the active material regions while maintaining structural integrity through the distributed particulate binder network.
Solution Approach 2:
The invention creates a composite material structure combining active material particles with particulate binder materials. This composite approach allows the electrode to achieve high filler loading from active materials while the particulate binder component provides the necessary structural integrity and strength, resolving the contradiction between productivity and strength.
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 environmental impact and production costs, allowing for scalable and efficient manufacturing of electrodes with increased strength and loading capacity.
Implementation Method 1
UHMWPE particles having a molecular weight of at least 2,000,000 g/mol and a melt enthalpy of at least 190 J/g to form fibrils that durably enmesh filler particles
Implementation Method 2
the filler particles are durably enmeshed within fibrils formed by the UHMWPE particles
Data Source
AI summary
Apparatuses, systems, materials, and methods for preparing polyethylene electrodes for use in energy storage and transfer via dry electrode processing is described herein. Ultra-high molecular weight polyethylene (UHMWPE) particles and filler particles are used to form a blended composition. With shear, the UHMWPE fibrillates to durably enmesh the filler particles. The blended composition with the fibrillated UHMWPE particles may, in turn, be used to form an article, such as an electrode. The blended composition may contain less than 10% by weight of the UHMWPE. The UHMWPE has a molecular weight of at least about 2,000,000 g/mol, a bulk density from about 0.04 g/mL to about 0.25 g/mL, and a melt enthalpy of at least 190 J/g. In some embodiments, the UHMWPE may be conditioned to alter the size and/or shape of the particles. The median diameter of the conditioned UHMWPE particles is from 5 microns to 300 microns.