Hybrid Carbon Anode Analysis Using XRD Capacity Separation
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Solution Overview
Problem
Current methods fail to effectively analyze and diagnose degradation in lithiation and delithiation behaviors of carbon-based and non-carbon-based materials in hybrid negative electrodes of secondary batteries, making it difficult to determine the cause of capacity reduction in these batteries.
Innovation Solution
A quantitative analysis method using X-ray diffractometry to measure lattice d-spacing changes during charge/discharge, allowing for the separation of capacity contributions from carbon-based and non-carbon-based materials by identifying inflection points in the discharge capacity graph, thereby diagnosing degradation in each material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If Si-based materials are used to increase capacity, then energy density is improved, but electrode structure stability deteriorates due to volume expansion and cracking
Solution Approach 1:
The patent applies the nesting principle by embedding Si-based particles inside a carbon matrix structure. The carbon material forms a container or framework that houses the Si particles, allowing the high-capacity Si to be protected while maintaining structural integrity during volume expansion and contraction cycles.
Solution Approach 2:
The patent uses composite materials by combining Si-based materials with carbon-based materials to create a hybrid negative electrode. This composite structure leverages the high capacity of Si while the carbon component provides structural stability and conductivity, resolving the contradiction between energy density and structural reliability.
2Use of energy by moving object
If hybrid negative electrode is used to improve energy density, then battery performance is improved, but analysis and degradation diagnosis capability deteriorates due to inability to separate material contributions
Solution Approach 1:
The patent applies segmentation by separating the analysis of capacity contributions from different materials in the hybrid electrode. Using XRD technology, the method segments the total capacity measurement into distinct contributions from carbon-based and Si-based materials, enabling precise diagnosis of each material's performance and degradation.
Solution Approach 2:
The patent uses XRD technology as an intermediary tool to indirectly measure and differentiate the capacity contributions of various materials in the hybrid electrode. This intermediary measurement approach enables precise analysis without directly interfering with the electrode structure or operation.
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 non-destructive analysis of the main reaction range and capacity contribution of non-carbon-based materials, allowing for the identification of the cause of degradation in carbon-based or non-carbon-based materials within the hybrid negative electrode, improving battery performance and longevity.
Implementation Method 1
measuring a lattice d-spacing of the carbon based negative electrode active material in the carbon based hybrid negative electrode during charging/discharging of the secondary battery using an X-ray diffractometer
Data Source
AI summary
A method of quantitatively analyzing a carbon based hybrid negative electrode including the steps of preparing a secondary battery including a carbon based hybrid negative electrode, where the carbon based hybrid negative electrode comprises a carbon based negative electrode active material and a non-carbon based negative electrode active material, measuring a lattice d-spacing of the carbon based negative electrode active material in the carbon based hybrid negative electrode during charging/discharging of the secondary battery using an X-ray diffractometer and then plotting a graph of a change in lattice d-spacing value as a function of charge/discharge capacity, detecting an inflection point of a slope of the graph during discharging; and then, quantifying capacity contribution of the carbon based negative electrode active material and the non-carbon based negative electrode active material in the total discharge capacity of the secondary battery by the inflection point of the slope of the graph.