Sintered Solid-State Battery Particle Sizing for Lower Interfacial Resistance
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Solution Overview
Problem
The high interfacial resistance between the solid electrolyte layer and the electrode layer in sintered all-solid-state batteries limits their capacity compared to lithium ion batteries, making them less efficient for industrial applications.
Innovation Solution
The sintered all-solid-state battery design includes a positive electrode layer, a solid electrolyte layer, and a negative electrode layer, where the average diameters of the electrode active material particles and solid electrolyte particles are controlled to satisfy specific ratios, allowing for optimal sintering and reducing interfacial resistance, thereby increasing battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sintered all-solid-state battery is manufactured by stacking solid electrolyte layer and electrode layer, then the battery structure is formed, but the interfacial resistance between solid electrolyte layer and electrode layer becomes high
Solution Approach 1:
The patent applies parameter changes by controlling the average particle diameters of electrode active material and solid electrolyte to satisfy specific ratio relationships (0.5≤a/b≤2.0). This parameter optimization during manufacturing reduces interfacial resistance while maintaining ease of production through standard sintering processes.
Solution Approach 2:
The patent uses composite materials by combining electrode active material particles with solid electrolyte particles in a controlled particle size ratio. This composite structure ensures optimal contact between different materials, reducing interfacial resistance while maintaining manufacturing simplicity.
2Quantity of substance
If the interfacial resistance between solid electrolyte layer and electrode layer is high, then the battery structure is stable, but the capacity is low compared to lithium ion battery
Solution Approach 1:
The patent increases battery capacity by changing the particle size parameters of electrode active material and solid electrolyte. By controlling the average diameter ratio (a/b) within 0.5 to 2.0, the patent optimizes the interface between layers, reducing resistance and enabling higher capacity comparable to lithium ion batteries.
3Reliability
If the average diameter of electrode active material particles and solid electrolyte particles are not controlled, then the manufacturing process is simple, but the interfacial resistance is high
Solution Approach 1:
The patent introduces particle diameter control as a manufacturing parameter, requiring the average diameter ratio (a/b) to be between 0.5 and 2.0. This parameter specification reduces interfacial resistance while maintaining reasonable manufacturing precision through standard particle size control techniques.
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
By controlling the diameter ratios of electrode active material and solid electrolyte particles, the interfacial resistance is significantly decreased, resulting in a higher capacity for the sintered all-solid-state battery, comparable to or exceeding that of lithium ion batteries.
Implementation Method 1
a method of manufacturing 'sintered all-solid-state battery' which includes stacking a solid electrolyte layer and an electrode layer, and then sintering it in a high-temperature furnace
Data Source
AI summary
The present disclosure relates to an all-solid-state battery. Specifically, an embodiment provides a sintered all-solid-state battery including a positive electrode layer, a solid electrolyte layer, and a negative electrode layer; wherein the positive electrode layer and the negative electrode layer include the same or different electrode active material particles; the solid electrolyte layer includes solid electrolyte particles; and an average diameter (a) of the electrode active material particles and an average diameter (b) of the solid electrolyte particles satisfy a relationship of an Equation 1:0.5≤(b/a)≤2.5[Equation 1]