Electrode Membrane Extrusion With Dual-Binder Mixing Uniformity
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Solution Overview
Problem
Existing battery production methods face challenges in improving production quality and energy density of batteries, particularly due to issues with binder dispersion, structural uniformity, and the limited plasticity and ductility of active substance mixtures.
Innovation Solution
A membrane preparation apparatus is introduced, comprising a mixing mechanism, a first feeding mechanism, a second feeding mechanism, and an extrusion die head. This apparatus directly mixes a powder mixture containing electrode active substance powder and a fibrotic binder with a solution containing a second binder, forming a clustered active substance mixture with enhanced viscosity and plasticity, which is then extruded to form a membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fibrotic first binder with poor solubility is directly mixed into the solution, then the binder aggregates and disperses poorly, but if mixed with powder first to form powder mixture, then the dispersion uniformity is improved
Solution Approach 1:
The first binder is pre-mixed with the active substance powder to form a powder mixture before being introduced to the solution. This preliminary action prevents aggregation during subsequent mixing steps and ensures uniform dispersion throughout the electrode slurry, directly resolving the dispersion uniformity issue.
2Manufacturing precision
If pure dry-method membrane preparation is used, then the process is simple, but the structural looseness and plasticity of the active substance mixture are insufficient, but if solution is added, then the plasticity and ductility are improved
Solution Approach 1:
The invention combines the dry-method binder (first binder) with a solution-based binder (second binder) to create a composite binding system. The first binder provides structural framework while the second binder enhances plasticity and ductility, achieving both mechanical properties and processing benefits without excessive complexity.
3Quantity of substance
If more binder is used to ensure adequate binding, then the binding effect is sufficient, but the content proportion of active substance decreases and energy density is reduced, but if less binder is used, then the binding effect is insufficient
Solution Approach 1:
The binding function is segmented between two distinct binders: the first binder (fibrotic, insoluble) provides structural binding framework, while the second binder (soluble) provides additional adhesion. This segmentation allows each binder to work at optimized lower concentrations, reducing total binder content while maintaining adequate binding effect and maximizing active substance proportion.
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 apparatus effectively improves the mixing uniformity and distribution uniformity of components in the active substance mixture, leading to enhanced energy density and production quality of the battery electrode sheet.
Implementation Method 1
the mixing mechanism is used for mixing the powder mixture with the solution
Implementation Method 2
the extrusion die head is connected to a discharge end of the mixing mechanism and is used for forming a membrane in an extrusion molding mode
Data Source
AI summary
A membrane preparation apparatus includes a mixing mechanism, a first feeding mechanism, a second feeding mechanism and an extrusion die head, wherein the first feeding mechanism is used for adding, into the mixing mechanism, a powder mixture containing powder and a first binder; the second feeding mechanism is used for adding, into the mixing mechanism, a solution dissolved with a second binder; the mixing mechanism is used for mixing the powder mixture with the solution; and the extrusion die head is connected to a discharge end of the mixing mechanism and is used for forming a membrane in an extrusion molding mode.