Porous Electrode Assembly for Solid-State Battery Interfacial Impedance
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Solution Overview
Problem
Current all-solid-state lithium batteries lack sufficient performance for high-power and high-capacity applications, requiring improvements in electrode assembly design to enhance charge transfer and interfacial impedance.
Innovation Solution
A method for producing an electrode assembly involving a porous active material molded body with a solid electrolyte layer, where the active material is molded using lithium multiple oxides and a pore-forming material, and a current collector is bonded to the active material exposed from the electrolyte layer, increasing the contact area and reducing interfacial impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a solid electrolyte layer is formed in the pores of the active material molded body, then the contact area between the active material and solid electrolyte is increased, but the manufacturing complexity is increased
Solution Approach 1:
The active material molded body is designed with a porous structure containing pores, where a solid electrolyte layer is formed within these pores. This porous structure naturally increases the contact area between the active material and solid electrolyte without requiring additional complex manufacturing steps, as the electrolyte simply fills the existing pore spaces.
Solution Approach 2:
The solid electrolyte layer is nested within the pores of the active material molded body, creating a hierarchical structure where the electrolyte is contained within the three-dimensional pore network. This nesting approach maximizes the interfacial contact area while maintaining a relatively simple manufacturing process, as the electrolyte is applied and forms within the pre-existing pore structure.
2Reliability
If the contact area between active material and solid electrolyte is increased, then the interfacial impedance is decreased, but the charge transfer efficiency may be affected
Solution Approach 1:
The solid electrolyte layer is specifically positioned within the pores of the active material molded body, creating localized regions of high interfacial contact. This local quality approach ensures that the electrolyte is in direct contact with the active material at the pore surfaces, minimizing interfacial impedance at these critical interfaces while maintaining efficient charge transfer pathways through the porous structure.
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 method enables favorable charge transfer and the production of high-power lithium batteries by increasing the contact area between the active material and the solid electrolyte layer, thereby improving the battery's capacity and output power.
Implementation Method 1
applying a liquid containing a constituent material of an inorganic solid electrolyte to the surface of the active material molded body including the inside of each pore of the active material molded body
Implementation Method 2
performing a heat treatment
Data Source
AI summary
A method for producing an electrode assembly includes: obtaining a porous active material molded body by molding a constituent material containing a lithium multiple oxide in the form of particles by compression, and then performing a heat treatment at a temperature of 850° C. or higher and lower than the melting point of the used lithium multiple oxide; forming a solid electrolyte layer by applying a liquid containing a constituent material of an inorganic solid electrolyte to the surface of the active material molded body including the inside of each pore of the active material molded body, and then performing a heat treatment; and bonding a current collector to the active material molded body exposed from the solid electrolyte layer.