Slurry Production via Hansen Parameter Control
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Solution Overview
Problem
Chronological aggregation of oxide active materials in battery slurries occurs due to low compatibility with the dispersion medium, leading to coating defects and inefficiencies in all solid-state battery production.
Innovation Solution
A method involving a two-step process to prepare a slurry with specific Hansen parameter relationships between the oxide active material, solid electrolyte, and dispersion medium, ensuring the addition of a conductive material and binder in a controlled manner to inhibit aggregation, using parameters σHa, σHb, and σHc to optimize compatibility and prevent particle agglomeration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If oxide active material is mixed with dispersion medium to form slurry, then active material layer can be formed for battery production, but chronological aggregation of oxide active material occurs due to low compatibility
Solution Approach 1:
The patent introduces a solid electrolyte as an intermediary substance between the oxide active material and the dispersion medium. The solid electrolyte acts as a mediator that improves compatibility by establishing specific Hansen parameter relationships (σHa−σHc≥5 and σHa>σHb>σHc), preventing direct incompatibility between the active material and dispersion medium, thereby restraining chronological aggregation while enabling slurry formation.
Solution Approach 2:
The patent applies parameter changes by controlling the Hansen solubility parameters of the components. Specifically, it establishes quantitative relationships among the Hansen parameters (σH) of oxide active material, solid electrolyte, and dispersion medium to optimize compatibility. This parameter control transforms the system from incompatible to compatible, preventing aggregation while maintaining manufacturability.
2Ease of manufacture
If conductive material and binder are added to dispersion containing oxide active material and solid electrolyte, then complete slurry formulation is achieved, but aggregation may occur if added simultaneously with active material
Solution Approach 1:
The patent segments the slurry formulation process into distinct sequential steps: first preparing a dispersion of oxide active material and solid electrolyte in the dispersion medium, then separately adding conductive material and binder in the adding step. This segmentation prevents premature aggregation by controlling the order of component addition, ensuring particle size uniformity while achieving complete formulation.
Solution Approach 2:
The patent applies preliminary action by first creating a stable dispersion of oxide active material and solid electrolyte before adding other components. This preliminary dispersion preparation establishes a compatible base system with controlled Hansen parameters, preventing aggregation issues that would occur if all components were mixed simultaneously.
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 method effectively restrains chronological aggregation of oxide active materials, reducing coating defects and enhancing the production of uniform active material layers for all solid-state batteries, as demonstrated by viscosity measurements and particle size stability over time.
Implementation Method 1
when Hansen parameters (σH) of the oxide active material, the solid electrolyte, and the dispersion medium are respectively regarded as σHa, σHb, and σHc, relationship of σHa−σHc≥5, and relationship of σHa>σHb>σHc are satisfied
Data Source
AI summary
A main object of the present disclosure is to provide a method for producing a slurry in which chronological aggregation of an oxide active material is restrained. The present disclosure achieves the object by providing a method for producing a slurry containing an oxide active material, a solid electrolyte, a dispersion medium, and at least one of a conductive material and a binder, the method comprising: a dispersion preparing step of preparing a dispersion containing the oxide active material, the solid electrolyte, and the dispersion medium; and an adding step of adding at least one of the conductive material and the binder to the dispersion; wherein when Hansen parameters (σH) of the oxide active material, the solid electrolyte, and the dispersion medium are respectively regarded as σHa, σHb, and σHc, relationship of σHa−σHc≥5, and relationship of σHa>σHb>σHc are satisfied.