Semi-Solid Electrode Dispensing for Edge-Controlled Cell Production

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Solution Overview

Problem

The production of semi-solid electrodes for electrochemical cells faces challenges such as edge control difficulties, loss of electrolyte due to evaporation, and inefficiencies in small batch processes leading to concentration gradients and lack of homogeneity.

Innovation Solution

A method for continuously or semi-continuously manufacturing electrochemical cells with semi-solid electrodes involves mixing active material, conductive material, and electrolyte to form a semi-solid electrode material, followed by vacuum drawing, compression into an electrode brick, and dispensing onto a current collector using a dispensation device with edge control features.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If semi-solid electrodes are produced using traditional coating methods with binding agents, then the electrode structure is cohesive and easier to handle, but the binding agents occupy space, add processing complexity, and impede ionic and electronic conductivity

Engineering Contradiction:

Improveelectrode structural integrityVSAvoidprocessing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent removes binding agents from the electrode formulation entirely, using semi-solid slurry that maintains coherence through controlled viscosity and composition rather than chemical binders. This extraction eliminates the space occupation and conductivity impediment while reducing processing complexity associated with binder application and curing.

Inventive Principle:

Principle #2Taking out (Extraction)

2Device complexity

If semi-solid electrodes are produced without binding agents, then ionic and electronic conductivity is improved and processing complexity is reduced, but edge control becomes difficult and edges may crumble

Engineering Contradiction:

Improveprocessing complexityVSAvoidedge control

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent controls edge integrity by adjusting slurry parameters including viscosity, solids content, and composition ratios rather than relying on binding agents. These parameter changes allow the semi-solid material to maintain structural coherence at edges during handling while preserving the benefits of binder-free construction.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If small batch processes are used for electrode production, then flexibility in production is maintained, but concentration gradients and lack of homogeneity occur in the electrodes

Engineering Contradiction:

Improveproduction flexibilityVSAvoidhomogeneity

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent employs continuous slurry preparation and dispensing processes that maintain consistent composition and viscosity throughout production. This continuity ensures homogeneous electrode structures even in smaller batches, as the semi-solid slurry is continuously mixed and delivered without interruption or variation in material properties.

Inventive Principle:

Principle #20Continuity of useful action

4Ease of manufacture

If traditional electrode production methods are used, then established processes are followed, but loss of electrolyte and solvent via evaporation occurs leading to inefficient battery performance

Engineering Contradiction:

Improveprocess familiarityVSAvoidelectrolyte loss

Core Design Contradiction:

Ease of manufactureVSLoss of substance

Solution Approach 1:

The patent implements controlled atmospheric conditions during slurry processing and electrode formation to minimize evaporation of electrolyte and solvent. By maintaining appropriate humidity and temperature control in the processing environment, the semi-solid electrodes retain their composition without significant volatile loss, improving battery performance.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

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 enables the production of electrochemical cells with improved edge integrity, reduced electrolyte loss, and enhanced homogeneity, leading to more efficient and consistent battery performance.

Implementation Method 1

drawing a vacuum on the semi-solid electrode material

Methodology Applied

Scientific EffectVacuum: Vacuum

Implementation Method 2

compressing the semi-solid electrode material to form an electrode brick

Methodology Applied

Scientific EffectCompression: Compression

Data Source

PatentUS20250070261A1Methods of continuous and semi-continuous production of electrochemical cells

Publication Date: 2025.02.27 24M TECHNOLOGIES INC

AI summary

Embodiments described herein relate generally to systems and methods for continuously and/or semi-continuously manufacturing electrochemical cells with semi-solid electrodes. In some embodiments, a method can include mixing an active material, a conductive material, and an electrolyte to form a semi-solid electrode material. The method further includes drawing a vacuum on the semi-solid electrode material, compressing the semi-solid electrode material to form an electrode brick, and dispensing a portion of the electrode brick onto a current collector via a dispensation device to form an electrode. In some embodiments, the current collector is disposed on a pouch material. In some embodiments, the dispensation device includes a top blade for top edge control and two side plates for side edge control. In some embodiments, the method can further include conveying the electrode through the top blade and the two side plates to shape the electrode.