All-Solid-State Battery Slurry Evaluation Using Multi-Frequency AC Impedance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods fail to accurately evaluate the coating state of a solid electrolyte in a positive electrode slurry for all-solid-state batteries, which affects battery performance and quality control.
Innovation Solution
A device with multiple channel units measuring AC impedance at different frequencies, using a flow path to analyze the coating state of the solid electrolyte based on AC impedance parameters, including a first, second, and optionally a third channel unit, and a control unit to maintain slurry temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single channel unit measures AC impedance at one frequency, then the measurement process is simple, but the evaluation accuracy of coating state is insufficient
Solution Approach 1:
The measurement system is segmented into multiple channel units, where each channel unit measures AC impedance at a specific frequency. This segmentation allows simultaneous multi-frequency measurement, improving the accuracy of coating state evaluation without requiring sequential measurements that would increase overall system complexity and measurement time.
Solution Approach 2:
Each channel unit is designed with multi-functionality to measure AC impedance across different frequency ranges. The channel units can operate independently or in combination, providing universal measurement capability that adapts to different evaluation requirements while maintaining a standardized measurement architecture.
2Measurement precision
If multiple frequency measurements are performed sequentially, then comprehensive AC impedance data is obtained, but the measurement time increases
Solution Approach 1:
The measurement system performs continuous AC impedance measurements at multiple frequencies simultaneously through parallel channel units. This continuous multi-frequency measurement approach eliminates the time loss associated with sequential measurements while maintaining comprehensive data collection, as all channel units operate concurrently to gather complete impedance characteristics.
Solution Approach 2:
The measurement task is segmented across multiple channel units, each handling a specific frequency measurement. This segmentation enables parallel execution of frequency-specific measurements, transforming a time-consuming sequential process into a simultaneous operation that reduces total measurement time while preserving data comprehensiveness.
3Measurement precision
If rheological evaluation using viscosity is used for slurry quality control, then the measurement method is simple, but it cannot accurately evaluate the coating state of solid electrolyte
Solution Approach 1:
The measurement system replaces mechanical rheological evaluation methods with electrical AC impedance measurement. This substitution enables accurate evaluation of coating state by measuring electrical properties that directly reflect the coating quality, rather than relying on indirect mechanical viscosity measurements that cannot distinguish coating characteristics.
Solution Approach 2:
The evaluation approach changes from measuring mechanical parameters (viscosity) to measuring electrical parameters (AC impedance). This parameter change enables direct assessment of coating state through electrical properties such as resistance and capacitance, which are sensitive to the coating quality of solid electrolyte on active material particles.
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
Enables accurate evaluation of the solid electrolyte coating state, improving battery performance and quality control by reducing measurement time and error, and enhancing the analysis of AC impedance results.
Implementation Method 1
a measurement unit provided at the flow path and configured to measure an AC impedance of the positive electrode slurry
Data Source
AI summary
To accurately evaluate a coating state of a solid electrolyte in a positive electrode active material in a positive electrode slurry for an all-solid-state battery. A device for evaluating a positive electrode slurry for an all-solid-state battery, including a flow path through which the positive electrode slurry flows and a measurement unit configured to measure an AC impedance of the positive electrode slurry, wherein the measurement unit includes a first channel unit configured to measure the AC impedance at a first predetermined frequency and a second channel unit configured to measure the AC impedance at a second predetermined frequency, and the measurement unit includes an evaluation unit configured to evaluate the quality of the coating state of a solid electrolyte in a positive electrode active material based on an imaginary axis parameter of the AC impedance and a real axis parameter of the AC impedance measured by the first channel unit and the second channel unit.