Solid Electrolyte Layer Particle Size Optimization
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Solution Overview
Problem
Secondary batteries face limitations due to high interfacial resistance and reduced ionic conductivity at the interface between electrodes and solid electrolyte layers, which affects their performance and stability.
Innovation Solution
Incorporating solid electrolyte particles with different particle diameters, where the solid electrolyte layer contains larger particles than the electrodes, to increase the contact area and reduce interfacial resistance, thereby enhancing lithium ion movement and ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If solid electrolyte particles are used to reduce flammability, then safety is improved, but interfacial resistance between electrode and solid electrolyte increases
Solution Approach 1:
The patent uses smaller solid electrolyte particles (0.1-1 μm) locally in the electrode to improve interfacial contact and reduce interfacial resistance, while using larger particles (3-10 μm) in the solid electrolyte layer to maintain low flammability and high safety. This localized particle size optimization resolves the contradiction between safety and interfacial resistance.
2Reliability
If larger solid electrolyte particles are used in the solid electrolyte layer, then ionic conductivity is maintained, but contact area with electrode active material decreases
Solution Approach 1:
The patent optimizes particle size locally: larger particles (3-10 μm) in the solid electrolyte layer maintain ionic conductivity, while smaller particles (0.1-1 μm) in the electrode increase contact area with active material. This spatial differentiation resolves the contradiction between ionic conductivity and contact area.
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
This configuration improves the stability and performance of secondary batteries by increasing lithium ion movement and minimizing the reduction in ionic conductivity, leading to better battery performance and longevity.
Implementation Method 1
the solid electrolyte layer may minimize the reduction of ionic conductivity by decreasing interfacial resistance due to the contact between the electrode and the solid electrolyte layer
Implementation Method 2
the electrode may increase the amount of movement of lithium ions by increasing a contact area between the solid electrolyte particles and electrode active material
Data Source
AI summary
Provided are a secondary battery including a positive electrode, a negative electrode, and a solid electrolyte layer disposed between the positive electrode and the negative electrode, wherein the positive electrode and the negative electrode include first solid electrolyte particles, the solid electrolyte layer includes second solid electrolyte particles, and a particle diameter of the second solid electrolyte particles is greater than a particle diameter of the first solid electrolyte particles.In the secondary battery, the electrode may increase the amount of movement of lithium ions by increasing a contact area between the solid electrolyte particles and electrode active material, and the solid electrolyte layer may minimize the reduction of ionic conductivity by decreasing interfacial resistance due to the contact between the electrode and the solid electrolyte layer. Thus, stability and performance of the secondary battery may be improved.