Solid-State Battery Cell Assembly With Wetting Membrane Interface
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Solution Overview
Problem
Existing solid-state battery cell assemblies face high impedance at solid-solid interfaces due to direct contact between electrodes and solid-state electrolytes, affecting performance and stability.
Innovation Solution
Incorporating a base membrane with adsorbed electrolyte solution between the electrodes and solid-state electrolyte layers, which reduces direct contact and maintains stable wetting, thereby reducing interface impedance and improving electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid-state electrolyte is used in direct solid-solid contact with electrodes, then battery safety and energy density 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 mediates the interaction between solid and liquid phases, thereby reducing the harmful solid-solid contact impedance while preserving the safety benefits of solid-state electrolytes.
Solution Approach 2:
The interface structure is transformed from a simple solid-solid contact to a composite structure combining solid-state electrolyte, base membrane, and adsorbed liquid electrolyte. This composite interface leverages the advantages of both solid and liquid electrolytes, achieving low impedance through liquid electrolyte wetting while maintaining safety through the solid-state component.
2Reliability
If liquid electrolyte solution is added to reduce interface impedance, then electrochemical performance improves, but electrolyte consumption increases during charge-discharge cycles
Solution Approach 1:
The base membrane possesses porous structure with specific pore size distribution that enables it to adsorb and retain liquid electrolyte solution. This porous structure allows the membrane to hold sufficient electrolyte for maintaining low interface impedance while limiting excessive electrolyte consumption during battery operation through capillary forces and surface adsorption.
Solution Approach 2:
The physical and chemical parameters of the base membrane are optimized, including pore size, surface area, and surface chemistry, to control the amount of electrolyte solution adsorbed. By adjusting these parameters, the system achieves optimal balance between maintaining low interface impedance and minimizing electrolyte consumption during charge-discharge cycles.
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 designed 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 adsorbed liquid electrolyte.
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, reduces interface impedance, and improves the stability and safety of solid-state batteries.
Implementation Method 1
an electrolyte solution is adsorbed onto the base membrane
Implementation Method 2
high ionic conductivity and low electronic conductivity, which improves the wettability to the solid-solid interfaces
Implementation Method 3
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
Figure 1~3
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Figure 7~9
AI summary
A solid-state battery cell assembly (10) and a preparation method therefor, a battery, and application thereof are provided. The solid-state battery cell assembly (10) is further provided with a base membrane (141) between a positive electrode (11) and a solid-state electrolyte layer (12) and/or between a negative electrode (13) and the solid-state electrolyte layer (12) that are included therein. An electrolyte solution (142) is adsorbed onto the base membrane (141). The base membrane (141) included in the solid-state battery cell assembly (10) can effectively reduce the direct contact of the contained electrolyte solution (142) with the electrodes and the solid-state electrolyte layer (12), which can reduce the consumption of the electrolyte solution (142) in the charge and discharge processes, and meanwhile, also can reduce the absorption of the electrolyte solution (142) by the solid-state electrolyte layer (12). The electrolyte solution (142) has a good and stable wetting effect on solid-solid interfaces between an electrode and the solid-state electrolyte layer (12), thereby significantly reducing the impedance between the solid-solid interfaces, so that the electrochemical performance of a battery including the solid-state battery cell assembly (10) is obviously improved.