Alkaline-Treated Electrode Solid Electrolyte Composite
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Solution Overview
Problem
The connection between electrodes and solid electrolytes in battery composites is often unreliable, leading to increased internal resistance.
Innovation Solution
A method to produce an electrode-solid electrolyte composite by applying an alkaline solution to the electrode surface, followed by a polymer with hydrolyzable groups, which forms a three-dimensional, highly viscous network, creating a strong bond between the electrode and solid electrolyte, using polymers like polyvinyl alcohol, ethylene vinyl alcohol copolymer, and polyacrylate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte layer is applied directly to the electrode, then the battery structure is simple, but the connection between electrode and solid electrolyte is unreliable
Solution Approach 1:
The electrode surface is alkalized in advance by applying an alkaline solution containing a polymer with hydrolyzable groups before applying the solid electrolyte composition. This preliminary alkalization creates a reactive surface that will form strong bonds with the solid electrolyte, resolving the connection reliability issue while maintaining a relatively simple overall process
Solution Approach 2:
The chemical state of the electrode surface is changed by alkalization, transforming it from a non-reactive state to a reactive state with hydroxyl groups. This parameter change enables strong chemical bonding with the solid electrolyte, improving connection reliability without significantly complicating the manufacturing process
2Reliability
If conventional electrode-separator composites are used, then the manufacturing process is simple, but the internal resistance increases significantly
Solution Approach 1:
The electrode surface is pre-treated with an alkaline solution to create a reactive interface before solid electrolyte application. This preliminary action ensures low internal resistance by establishing strong chemical bonds, while the process remains manufacturable through straightforward sequential steps
Solution Approach 2:
The alkaline solution acts as an intermediary substance that facilitates strong bonding between the electrode and solid electrolyte. This intermediary layer with polymer containing hydrolyzable groups creates a transition zone that ensures good electrical contact and low internal resistance
3Strength
If the polymer concentration is increased to improve adhesion, then the bond strength increases, but the viscosity becomes too high for proper application
Solution Approach 1:
The chemical composition of the alkaline solution is optimized to contain polymers with hydrolyzable groups at specific concentrations and molecular weights. This parameter optimization ensures sufficient adhesion strength while maintaining appropriate viscosity for application. The hydrolyzable groups provide bonding capability without requiring excessive polymer concentration
Solution Approach 2:
The polymer with hydrolyzable groups is applied locally to the electrode surface where it is needed for bonding. The alkaline solution is applied first to create a reactive surface, then the solid electrolyte composition is applied. This localized application ensures strong adhesion at the interface while keeping the overall formulation workable
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
Results in an electrode-solid electrolyte composite with high current-carrying capacity and improved adhesion, reducing internal resistance and enhancing battery performance.
Implementation Method 1
applying an alkaline solution to the electrode surface, followed by a polymer with hydrolyzable groups, which forms a three-dimensional, highly viscous network, creating a strong bond between the electrode and solid electrolyte
Data Source
Figure 1A~1E
AI summary
This paper describes a process for producing an electrode-solid electrolyte composite in which a solid electrolyte layer is formed on the surface of an electrode. To form the solid electrolyte layer, an alkaline solution is applied to the surface. Subsequently, at least one polymer is deposited onto the alkalized surface. This polymer has hydrolyzable groups and its ability to form a three-dimensional, highly viscous network increases upon at least partial hydrolysis of these groups. Furthermore, an electrode-solid electrolyte composite producible according to this process and a battery incorporating such a composite are described.