Electrode Material Quantification via Resistance and Topography Scatter Diagrams
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Solution Overview
Problem
Lithium ion battery electrodes experience volume changes and cracking during cycle endurance tests, leading to reduced battery capacity due to disconnected active materials and increased inactive material, which existing methods fail to quantify effectively.
Innovation Solution
A quantification method and apparatus that utilize a Scanning Spread Resistance Microscope (SSRM) and Atomic Force Microscope (AFM) to obtain material and resistance distribution information, producing a scatter diagram divided into regions to quantify the electrode material, specifically identifying active, conductive assistant, binder, and inactive states of the active material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to analyze electrode materials, then the analysis process is simple, but the ability to quantify active and inactive material percentages is insufficient
Solution Approach 1:
The patent combines multiple measurement techniques (electrical resistance measurement and surface topography measurement) into a single integrated analysis system. The scatter diagram plots both resistance values and surface height values simultaneously, merging two different measurement dimensions to achieve comprehensive material quantification that neither method could achieve alone.
Solution Approach 2:
The patent transitions from single-parameter analysis to two-dimensional analysis by creating scatter diagrams that plot resistance values against surface height values. This dimensional expansion allows differentiation of material states (active vs. inactive) that cannot be distinguished using only resistance or only height measurements.
2Measurement precision
If the electrode material is analyzed using single-parameter methods, then the analysis is straightforward, but the differentiation between active and inactive material is inaccurate
Solution Approach 1:
The patent uses two-dimensional scatter diagrams plotting resistance versus surface height to differentiate material states. This dual-parameter approach enables accurate identification of active material (specific resistance and height ranges) versus inactive material (different resistance and height characteristics), overcoming the limitations of single-parameter methods.
Solution Approach 2:
The patent applies different analysis criteria to different regions of the scatter diagram, establishing specific thresholds and ranges for resistance and height values that correspond to different material states. This localized quality assessment allows precise differentiation of active and inactive materials based on their distinct physical property combinations.
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 quantitative analysis of battery capacity deterioration and optimization of electrode component proportions, improving battery performance by accurately quantifying active and inactive material percentages, thereby enhancing battery efficiency and production conditions.
Implementation Method 1
obtain information regarding a distribution of resistance in the electrode
Implementation Method 2
obtain information regarding a distribution of a material in an electrode
Data Source
AI summary
In a quantification method for an electrode material, information regarding a distribution of a material in an electrode is obtained. Information regarding a distribution of resistance in the electrode is obtained. A scatter diagram is produced based on the information regarding the distribution of the material and the information regarding the distribution of the resistance. The scatter diagram is divided into a plurality of regions. The material constituting the electrode is quantified based on the divided regions.