Solid-State Battery Cell Assembly With Base Membrane Interface
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Solution Overview
Problem
Solid-state batteries face high impedance at solid-solid interfaces due to direct contact between electrodes and solid-state electrolytes, affecting performance and stability.
Innovation Solution
A base membrane is introduced between the electrodes and solid-state electrolyte layers, adsorbing an electrolyte solution to reduce direct contact and maintain stable wetting, thereby reducing interface impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid-state electrolyte is used in direct solid-solid contact with electrodes, then battery energy density and safety are improved, but interface impedance increases significantly
Solution Approach 1:
A base membrane is introduced as an intermediary layer between the solid-state electrolyte and the electrode. This base membrane adsorbs liquid electrolyte solution, creating a hybrid interface that facilitates ion transport while maintaining the advantages of solid-state batteries. The base membrane acts as a mediator that reconciles the contradiction between solid-solid contact safety and interface impedance by providing a controlled liquid electrolyte interface.
Solution Approach 2:
The invention changes the physical state parameters at the electrode-electrolyte interface by introducing a base membrane with specific adsorption properties. The base membrane controls the amount and distribution of liquid electrolyte solution, effectively adjusting the interface characteristics from pure solid-solid contact to a hybrid solid-liquid interface, thereby reducing impedance while maintaining safety.
2Reliability
If electrolyte solution is added to reduce interface impedance, then electrochemical performance improves, but electrolyte solution consumption increases during charge-discharge cycles
Solution Approach 1:
The base membrane serves as a reservoir and controlled delivery system for the electrolyte solution. It adsorbs the electrolyte solution and releases it in a controlled manner at the electrode interface, reducing uncontrolled consumption during charge-discharge cycles while maintaining sufficient electrolyte for electrochemical reactions.
Solution Approach 2:
The base membrane utilizes its porous structure to adsorb and retain electrolyte solution. The porous architecture provides high surface area for electrolyte adsorption, allowing the membrane to hold sufficient electrolyte solution locally at the interface while minimizing overall electrolyte consumption and preventing excessive absorption by the solid-state electrolyte.
3Object-affected harmful factors
If base membrane is introduced between electrode and solid-state electrolyte, then interface impedance is reduced, but device structure becomes more complex
Solution Approach 1:
The base membrane is implemented as a thin film structure that can be easily integrated into the existing battery cell architecture. This thin film approach minimizes the additional structural complexity while effectively performing the function of reducing interface impedance through electrolyte solution adsorption and controlled release.
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 base membrane with adsorbed electrolyte solution enhances ionic conductivity, improves wettability, and stabilizes the electrolyte, significantly reducing interface impedance and enhancing electrochemical performance and safety.
Implementation Method 1
an electrolyte solution is adsorbed onto the base membrane
Implementation Method 2
keep the electrolyte solution having a good and stable wetting effect on the solid-solid interface between an electrode and the solid-state electrolyte layer
Data Source
AI summary
A solid-state battery cell assembly is provided with a base membrane between a positive electrode and a solid-state electrolyte layer and/or between a negative electrode and the solid-state electrolyte layer that are included therein. An electrolyte solution is adsorbed onto the base membrane. The base membrane included in the solid-state battery cell assembly can effectively reduce the direct contact of the contained electrolyte solution with the electrodes and the solid-state electrolyte layer, which can reduce the consumption of the electrolyte solution in the charge and discharge processes, and meanwhile, also can reduce the absorption of the electrolyte solution by the solid-state electrolyte layer.