Positive Electrode Slurry Staging for All-Solid-State Battery Dispersion
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Solution Overview
Problem
Existing all-solid-state batteries face challenges in achieving optimal dispersion characteristics and ionic conductivity in the positive electrode slurry, leading to reduced energy density and safety concerns due to potential short-circuits.
Innovation Solution
A multi-stage mixing process is employed to manufacture the positive electrode slurry, adjusting the solid content percentages in each stage to ensure uniform distribution of the positive electrode active material, solid electrolyte, and conductive material, forming a smooth ion conduction pathway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-stage mixing process is used to manufacture positive electrode slurry, then the manufacturing process is simple and fast, but the dispersion characteristics of solid electrolyte and active material are insufficient leading to reduced ionic conductivity
Solution Approach 1:
The mixing process is divided into multiple stages with different solid content percentages (first stage: 90-95%, second stage: 85-90%, third stage: 80-85%). Each stage performs a specific function: initial mixing, homogeneous distribution, and final slurry formation. This segmentation resolves the contradiction by achieving superior dispersion characteristics through staged processing while maintaining reasonable process complexity.
Solution Approach 2:
The binder solution is added in advance during the first mixing stage at high solid content (90-95%) to pre-coat the active material and solid electrolyte particles. This preliminary action ensures uniform distribution before subsequent dilution stages, improving ionic conductivity without requiring excessively complex later-stage processing.
2Productivity
If solid content is maintained at high percentage throughout mixing, then manufacturing efficiency is high, but uniform distribution of conductive material and solid electrolyte is poor leading to short-circuit risks
Solution Approach 1:
The mixing process is divided into three stages with progressively decreasing solid content: Stage 1 (90-95% solid content) for initial mixing, Stage 2 (85-90% solid content) for homogeneous distribution, and Stage 3 (80-85% solid content) for final slurry formation. This segmentation allows high productivity in early stages while ensuring reliable uniform distribution in later stages, preventing short-circuits through proper conductive material dispersion.
Solution Approach 2:
The solid content parameter is dynamically changed across mixing stages. Starting at 90-95% for efficiency, then reducing to 85-90% for uniform distribution, and finally to 80-85% for optimal slurry properties. This parameter change strategy resolves the contradiction by optimizing both productivity and reliability at different process phases.
3Reliability
If binder solution is added in large amounts early in mixing, then dispersion characteristics improve, but the slurry becomes too liquid affecting coating quality and energy density
Solution Approach 1:
The binder solution addition is segmented across three mixing stages. In Stage 1 (90-95% solid content), binder is added to achieve initial dispersion. In Stage 2 (85-90% solid content), additional binder ensures homogeneous distribution. In Stage 3 (80-85% solid content), final binder adjustment optimizes slurry properties. This segmented approach achieves excellent dispersion characteristics while maintaining appropriate solid content (80-85%) for high-quality coating and energy density.
Solution Approach 2:
The binder content and solid content parameters are dynamically adjusted across mixing stages. The solid content decreases from 90-95% to 80-85% while binder is progressively added to maintain dispersion quality. This parameter change strategy resolves the contradiction by achieving reliable dispersion without excessive liquid content, preserving coating quality and energy density.
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 enhances ionic conductivity and energy density while reducing the risk of short-circuits, thereby improving the safety and performance of all-solid-state batteries.
Implementation Method 1
adding a binder solution to the first mixture to perform a first kneading process on a second mixture having an amount of solid content adjusted to a range of about 94 wt % to about 95 wt %
Implementation Method 2
adding a conductive material solution to the third mixture to perform a mixing process on a fourth mixture having an amount of solid content adjusted to a range of about 70 wt % to about 89.9 wt %
Implementation Method 3
performing a multi-stage mixing process on the second mixture
Data Source
AI summary
Disclosed are methods of manufacturing positive electrode slurries for all-solid-state batteries, and positive electrodes manufactured using the methods. The method includes preparing a first mixture including a positive electrode active material and a solid electrolyte, adding a binder solution to the first mixture to perform a first kneading process on a second mixture having a solid content adjusted to a range of about 94 wt % to about 95 wt %, adding the binder solution to the second mixture to perform a second kneading process on a third mixture having a solid content adjusted to a range of about 90 wt % to about 93.9 wt %, and adding a conductive material solution to the third mixture to perform a mixing process on a fourth mixture having a solid content adjusted to a range of about 70 wt % to about 89.9 wt %.