Positive Electrode Slurry Stability for High Solid Content
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Summary
Problems
The existing methods for preparing positive electrode slurries with high solid content face issues with rapid viscosity increase over time, leading to gelation and difficulties in forming uniform electrode layers, which affects the quality and efficiency of the positive electrode preparation process.
Innovation solutions
A method involving mixing a positive electrode active material, conductive agent, and binder in a non-aqueous solvent at controlled temperatures (-20°C to 45°C) and cooling to -30°C to 15°C to prepare a positive electrode slurry precursor, followed by maintaining a specific viscosity increase rate, effectively suppressing viscosity growth and enabling high solid content preparation.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the solid content of the positive electrode slurry is increased to improve productivity and electrode drying efficiency, then the viscosity of the slurry increases rapidly over storage time, causing gelation and quality problems
Why choose this principle:
The patent applies parameter changes by controlling the particle size distribution of the positive electrode active material (specifically D10, D50, D90 values) and adjusting the solvent composition ratio to modify the slurry's rheological properties. This allows high solid content (60-80 wt%) to be achieved while maintaining stable viscosity over storage time by optimizing these physical parameters
Principle concept:
If the solid content of the positive electrode slurry is increased to improve productivity and electrode drying efficiency, then the viscosity of the slurry increases rapidly over storage time, causing gelation and quality problems
Why choose this principle:
The patent uses composite materials by formulating a multi-component slurry system comprising positive electrode active material, conductive agent, binder, and solvent in specific ratios. The composite structure with controlled particle size distribution creates a stable slurry that resists gelation while maintaining high solid content, resolving the contradiction between productivity and viscosity stability
Application Domain
Data Source
AI summary:
A method involving mixing a positive electrode active material, conductive agent, and binder in a non-aqueous solvent at controlled temperatures (-20°C to 45°C) and cooling to -30°C to 15°C to prepare a positive electrode slurry precursor, followed by maintaining a specific viscosity increase rate, effectively suppressing viscosity growth and enabling high solid content preparation.
Abstract
The present invention relates to a method of preparing a positive electrode slurry composition, which includes steps of (S1) adding a positive electrode active material, a conductive agent, a binder, and a non-aqueous solvent to a mixer and mixing to prepare a mixture having a solid content of greater than 60 wt% and a temperature of -20°C to 45°C; (S2) cooling the mixture to -30°C to 15°C to prepare a positive electrode slurry composition precursor; and (S3) maintaining a temperature of the positive electrode slurry composition precursor to prepare a positive electrode slurry composition having a V72 of 0% to 50%, wherein Vn is a viscosity increase rate when the temperature of the positive electrode slurry composition precursor is maintained for n hours, and the viscosity increase rate is represented by Equation 1 described in the present specification, and a method of preparing a positive electrode.