All-Solid-State Battery Electrode Coating for Uniform Triple Points
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Solution Overview
Problem
Existing methods for manufacturing all-solid-state batteries face challenges in uniformly mixing electrode active materials, solid electrolytes, and conductive agents, leading to non-uniform contact surfaces and reduced energy density due to isolated components and blocked lithium ion pathways.
Innovation Solution
A method involving the use of two different types of binders and solvents in sequential slurry preparation steps to ensure uniform mixing and contact between electrode active materials, solid electrolytes, and conductive agents, with the conductive agent added in a secondary slurry phase to minimize isolation and maximize triple points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrode active material, solid electrolyte, and conductive agent are simultaneously mixed, then manufacturing process is simple, but components become isolated and lithium ion pathways are blocked
Solution Approach 1:
The mixing process is divided into two separate stages: first mixing electrode active material with solid electrolyte, then adding conductive agent in a second step. This segmentation prevents premature isolation of components and ensures uniform distribution of all ingredients throughout the electrode structure.
Solution Approach 2:
The electrode active material and solid electrolyte are mixed and formed into a preliminary structure before the conductive agent is added. This preliminary action ensures that the active material and electrolyte are properly distributed and contacted before the conductive agent is introduced, preventing isolation issues.
2Ease of manufacture
If compression molding method is used to manufacture all-solid-state battery, then manufacturing is simplified, but uniform current distribution is not achieved
Solution Approach 1:
The electrode active material, solid electrolyte, and conductive agent are thoroughly mixed and uniformly distributed in the slurry before the compression molding step. This preliminary mixing action ensures that when compression molding is applied, the uniform slurry structure is maintained, resulting in uniform current distribution throughout the electrode without requiring complex molding techniques.
3Reliability
If triple points are increased in electrode, then electrochemical reaction efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The conductive agent is added as a separate component in a second mixing step rather than being combined with all other ingredients at once. This segmentation allows the conductive agent to specifically target and connect triple points (where active material, electrolyte, and pores meet) without requiring complex manufacturing processes, thereby improving electrochemical reaction efficiency through increased triple point formation.
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 energy density by reducing unnecessary solid electrolyte and electrode active material usage, improving lithium ion conductivity and overall battery performance.
Implementation Method 1
a first binder and a second binder, each serving as a binding agent
Implementation Method 2
a first solvent and a second solvent, each serving as a solvent for the binders
Data Source
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AI summary
The present invention relates to a method of manufacturing an electrode of an all-in-one battery comprising the steps of mixing an electrode active material, a solid electrolyte and a first binder with a first solvent to prepare a primary slurry; drying the primary slurry to prepare a mixture powder; mixing the mixture powder, a conductive agent, and a second binder with a second solvent to prepare a secondary slurry; and coating the secondary slurry on a current collector.