Composite Electrode Coating via In-Situ Solid Electrolyte Formation
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Solution Overview
Problem
Conventional methods for manufacturing composite electrodes for all-solid-state batteries are cumbersome, time-consuming, and limited by the need for two separate steps and solvent dissolution, restricting applicability.
Innovation Solution
A method involving mixing a solid electrolyte precursor with a polar solvent to form a precursor solution, stirring, adding an active material to create an electrode slurry, and heat-treating to synthesize a solid electrolyte and form a coating layer simultaneously on the active material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional two-step method is used to manufacture composite electrode (preparing solid electrolyte through heat treatment, then coating active material with dissolved electrolyte solution), then the solid electrolyte can be formed on active material, but the manufacturing process becomes cumbersome and time-consuming
Solution Approach 1:
The patent combines the solid electrolyte preparation step and the coating step into a single simultaneous process. The slurry containing solid electrolyte precursors is applied to the active material, and both the precursor formation and coating occur in one manufacturing step, eliminating the need for separate heat treatment and coating operations.
Solution Approach 2:
The solid electrolyte precursors are pre-mixed with binders and conductive materials to form a slurry before application. This preliminary preparation ensures that when the slurry is applied and heated, the solid electrolyte forms directly in the correct location and configuration, reducing subsequent processing steps.
2Reliability
If a conventional two-step method is used to manufacture composite electrode, then the solid electrolyte can be formed on active material, but the processing time becomes long
Solution Approach 1:
The patent merges the heat treatment step and coating step into a single simultaneous operation. The slurry is applied to the active material and then heated in one continuous process, where the solid electrolyte precursors convert to solid electrolyte and form the coating simultaneously, eliminating the time required for separate sequential steps.
Solution Approach 2:
The manufacturing process maintains continuous useful action by applying the slurry and immediately proceeding to heat treatment in an uninterrupted sequence. The conversion of precursors to solid electrolyte occurs continuously during the heating process, maximizing the efficiency of each step without idle transitions.
3Reliability
If a conventional method using solvent dissolution is used to coat active material with solid electrolyte, then the electrolyte solution can be applied, but applicability is limited because only solvents enabling complete dissolution are useful
Solution Approach 1:
The patent changes the fundamental parameter from using dissolved electrolyte solutions to using solid electrolyte precursors in slurry form. This parameter change eliminates the constraint of solvent dissolution requirements, allowing selection from a broader range of solvents and binder combinations that can form stable slurries without requiring complete electrolyte dissolution.
Solution Approach 2:
The patent introduces solid electrolyte precursors as an intermediary form between solid electrolyte and dissolved electrolyte solution. These precursors can be dispersed in various solvents to form slurries, providing flexibility in solvent selection while still enabling effective coating and subsequent conversion to functional solid electrolyte during heat treatment.
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 method enhances processing efficiency, allows flexible electrolyte composition, and results in a composite electrode with improved battery performance, including increased contact area and 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.