Solid-State Battery Electrode Binding for Low-Resistance Interfaces
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Solution Overview
Problem
Lithium secondary batteries with solid electrolytes face challenges in achieving excellent interfacial contact between electrodes and the solid electrolyte, leading to increased resistance and reduced energy density due to non-uniform contact interfaces and thicker solid electrolyte membranes.
Innovation Solution
A method for manufacturing solid-state batteries involving the application of slurry for solid electrolyte layers on electrodes, followed by stacking and pressurization to ensure close contact between the electrolyte layers, which are then dried to form a solid electrolyte membrane, allowing for improved adhesion and reduced interfacial resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte membrane is used to ensure safety and prevent leakage, then reliability is improved, but the membrane thickness increases leading to degradation of energy density
Solution Approach 1:
The solid electrolyte membrane is divided into multiple thin layers (first solid electrolyte layer, second solid electrolyte layer, etc.) stacked in sequence. Each layer has a thickness of 1-10 μm, and the total thickness is controlled to be 5-50 μm. This segmentation allows the membrane to maintain sufficient safety functionality while reducing overall thickness to improve energy density.
2Reliability
If a solid electrolyte membrane is used to prevent leakage, then reliability is improved, but the membrane thickness increases resulting in larger size
Solution Approach 1:
The solid electrolyte membrane is divided into multiple thin layers (first solid electrolyte layer, second solid electrolyte layer, etc.) stacked in sequence. Each layer has a thickness of 1-10 μm, and the total thickness is controlled to be 5-50 μm. This segmentation allows the membrane to maintain sufficient safety functionality while reducing overall thickness to improve energy density.
3Reliability
If a solid electrolyte is used to ensure safety, then reliability is improved, but uniform contact interface between electrode and solid electrolyte is difficult to form leading to increased resistance
Solution Approach 1:
Electrode slurry layers are applied to the surfaces of electrodes before assembly. These slurry layers serve as preliminary contact-enhancing interfaces that facilitate uniform contact between the solid electrolyte membrane and electrodes, reducing interfacial resistance and improving manufacturing precision of the contact interface.
Solution Approach 2:
Electrode slurry layers act as intermediary materials between the solid electrolyte membrane and electrodes. These slurry layers improve interfacial contact by providing a compliant, conductive interface that accommodates manufacturing variations and ensures uniform electrical and ionic contact, thereby reducing interfacial resistance.
4Reliability
If a solid electrolyte is used to prevent leakage, then reliability is improved, but contact with electrode active material is poor causing increased resistance
Solution Approach 1:
Electrode slurry layers are applied to the surfaces of electrodes before assembly. These slurry layers serve as preliminary contact-enhancing interfaces that facilitate uniform contact between the solid electrolyte membrane and electrodes, reducing interfacial resistance and improving manufacturing precision of the contact interface.
Solution Approach 2:
Electrode slurry layers act as intermediary materials between the solid electrolyte membrane and electrodes. These slurry layers improve interfacial contact by providing a compliant, conductive interface that accommodates manufacturing variations and ensures uniform electrical and ionic contact, thereby reducing interfacial resistance.
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 method results in improved interfacial properties, reduced resistance, and controlled thickness of the solid electrolyte membrane, enhancing energy density and battery performance.
Implementation Method 1
carrying out drying of the product of step S3)
Implementation Method 2
binding the first electrode portion with the second electrode portion in such a manner that the electrode slurry layers may face each other
Data Source
AI summary
The present disclosure relates to a method for manufacturing a solid-state battery, wherein slurry for a solid electrolyte layer is applied to each of the electrodes, and the electrodes are bound to each other before drying to obtain a solid-state battery. In the solid-state battery, each electrode is in close contact with the solid electrolyte membrane to provide excellent interfacial property, such as reduced resistance. In addition, the thickness of the solid electrolyte membrane may be controlled to a level of several microns to provide an effect of increasing the energy density of a unit cell.