Composite Electrode Coating for Faster All-Solid-State Battery Processing
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Solution Overview
Problem
Conventional methods for manufacturing composite electrodes for all-solid-state batteries are cumbersome, time-consuming, and limited in applicability due to the need for two separate steps: preparing a final solid electrolyte through heat treatment and coating an active material with a solvent-based solution, with restricted solvent choices.
Innovation Solution
A method involving mixing a solid electrolyte precursor with a polar solvent to create a precursor solution, stirring, and adding an active material to form an electrode slurry, followed by heat treatment to synthesize a solid electrolyte and form a coating layer on the active material, allowing for flexible electrolyte composition and improved processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional two-step method is used to manufacture composite electrodes, then the solid electrolyte can be properly synthesized and coated, but the processing time is long and the manufacturing process is cumbersome
Solution Approach 1:
The patent combines the solid electrolyte synthesis step and the coating step into a single integrated process. The slurry containing solid electrolyte precursors is applied to the active material in one step, and subsequent heat treatment simultaneously synthesizes the solid electrolyte and forms the coating layer, eliminating the need for separate synthesis and coating operations.
Solution Approach 2:
The patent prepares a slurry containing solid electrolyte precursors mixed with solvents and binders in advance. This preliminary preparation allows the slurry to be directly applied to the active material, and the heat treatment process then converts the precursors into the final solid electrolyte coating, streamlining the overall manufacturing process.
2Manufacturing precision
If a conventional two-step method with heat treatment and solvent coating is used, then the solid electrolyte coating can be formed, but the process is complex and has limited applicability
Solution Approach 1:
The patent merges multiple process steps into a single integrated manufacturing approach. The slurry preparation, application, and heat treatment processes are combined to achieve both solid electrolyte synthesis and coating formation in one continuous operation, reducing process complexity and improving manufacturability.
Solution Approach 2:
The patent utilizes controlled heat treatment parameters (temperature, time, atmosphere) to transform the solid electrolyte precursors in the slurry into the final solid electrolyte coating. By optimizing these parameters, the process achieves reliable coating formation while maintaining simplicity and broad applicability to different battery systems.
3Reliability
If only solvents that enable complete dissolution are used in conventional methods, then the coating process works reliably, but the applicability is limited
Solution Approach 1:
The patent changes the chemical parameters of the slurry system by using solid electrolyte precursors that can be dissolved in a broader range of solvents. This allows selection from multiple solvent types (e.g., organic solvents, alcohols, water) depending on the specific application requirements, while maintaining reliable coating formation through controlled heat treatment that converts the precursors into the final solid electrolyte coating.
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 approach enhances processing efficiency, allows for diverse solid electrolyte compositions, and results in a composite electrode with an amorphous solid electrolyte coating layer, improving battery performance by increasing the contact area between the active material and the electrolyte, leading to superior initial discharge capacity and lifetime.
Implementation Method 1
mixing a solid electrolyte precursor and a polar solvent to prepare a precursor solution
Implementation Method 2
heat treatment, thereby synthesizing a solid electrolyte and simultaneously forming a coating layer including the same on the surface of the active material
Data Source
AI summary
A method of manufacturing a composite electrode for an all-solid-state battery includes: preparing a precursor solution by mixing at least one solid electrolyte precursor and at least one polar solvent; stirring the precursor solution; preparing an electrode slurry by adding an active material to the stirred precursor solution; and heat-treating the electrode slurry and obtaining the composite electrode for the all-solid-state battery, wherein the composite electrode for the all-solid-state battery includes: the active material; and a coating layer disposed on the active material and including a solid electrolyte.