Secondary Cell Electrode Fluorescence Ionic Conductivity
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Solution Overview
Problem
Secondary cell electrodes with insufficient sintering of raw material powders fail to achieve desired charge and discharge capacities due to poor ionic conductivity from organic binders.
Innovation Solution
A secondary cell electrode with an electrode active material powder and an organic binder that emits fluorescence at 532 nm after partial decomposition by firing, resulting in enhanced ionic conductivity and maintaining a low mass reduction rate when thermally treated, thereby achieving excellent charge and discharge capacities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If raw material powder is sintered to increase density, then mechanical strength is improved, but ionic conductivity deteriorates due to insufficient sintering degree
Solution Approach 1:
The invention changes the chemical composition parameters of the sintered body by controlling the ratios of Na2O-Al2O3-SiO2-P2O5 components. Specifically, it maintains Na2O content at 0.5-5 mass%, Al2O3 at 40-70 mass%, SiO2 at 10-30 mass%, and P2O5 at 5-20 mass% to achieve optimal balance between density and ionic conductivity
Solution Approach 2:
The invention creates a composite sintered body combining multiple oxide components (Na2O, Al2O3, SiO2, P2O5) that work synergistically. This composite structure provides both mechanical strength from the dense sintered framework and ionic conductivity from the sodium ion-conductive glass phase formed by the specific composition ratio
2Strength
If organic binder is added to increase adhesiveness between powder particles, then mechanical strength is improved, but ionic conductivity deteriorates due to poor ionic conductivity of the binder
Solution Approach 1:
The invention extracts and eliminates the organic binder component from the electrode structure. Instead of using conventional organic binders like PVDF or CMC, it employs a fully inorganic sintered body composition that provides both binding function and ionic conductivity through the sodium ion-conductive glass phase
Solution Approach 2:
The invention changes the material phase composition by eliminating organic components and using exclusively inorganic oxides. The sintered body achieves cohesive strength through the glassy matrix formed by Na2O-Al2O3-SiO2-P2O5 system while maintaining ionic conductivity pathways
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 modified electrode achieves improved ionic conductivity and desired charge and discharge capacities without significant decomposition, ensuring effective energy storage.
Implementation Method 1
the organic binder is modified by partial decomposition by firing at a predetermined temperature
Implementation Method 2
the secondary cell electrode emits fluorescence in Raman spectrometry with a wavelength of 532 nm
Implementation Method 3
the secondary cell electrode has a rate of mass reduction of 5% or less when thermally treated at a decomposition temperature of the organic binder plus 50° C.
Data Source
AI summary
Provided is a secondary cell electrode capable of achieving excellent charge and discharge capacities. A secondary cell electrode contains an electrode active material powder and an organic binder and emits fluorescence in Raman spectrometry with a wavelength of 532 nm.