Rotary Revolutionary Kneading for Sulfide Coated Active Material
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Solution Overview
Problem
Mechanical coating processes for active materials in solid-state batteries often cause surface damage, such as cracking and peeling of the coating layer, due to direct collisions with crushing media, which deteriorate the material's performance.
Innovation Solution
A rotary and revolutionary kneading process is employed without using a crushing medium, allowing for the formation of a sulfide solid electrolyte coating layer on the active material surface while minimizing damage, by using a closed vessel to apply centrifugal force and frictional energy effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mechanical coating process using a crushing medium is employed, then a coating layer can be formed on the active material surface, but the active material surface suffers damage such as cracking and peeling
Solution Approach 1:
A binder is introduced as an intermediary substance that facilitates the formation of a coating layer without requiring direct contact between the crushing medium and the active material surface. The binder acts as a mediating material that holds the coating particles together and adheres them to the active material surface, thereby preventing surface damage while still achieving effective coating formation
Solution Approach 2:
The invention replaces the traditional mechanical crushing-based coating system with a chemical/biochemical-based coating system. Instead of relying on mechanical forces from crushing media to form and adhere the coating layer, the process uses chemical bonding and biological adhesion mechanisms through the binder, thereby eliminating the harmful mechanical impacts on the active material surface
2Productivity
If high mixing force is applied using conventional planetary mixer, then mixing efficiency is improved, but the active material particles are damaged
Solution Approach 1:
The invention replaces high-force mechanical mixing with a gentler mixing approach that uses the binder's adhesive properties to achieve uniform distribution of coating particles. The mixing process relies on the binder's ability to bind particles together rather than on high mechanical forces, thereby maintaining particle integrity while achieving effective mixing and coating 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 method prevents coating layer deterioration and peeling, maintaining the active material's integrity and enhancing ion conductivity, resulting in a coated active material with improved performance for solid-state batteries.
Implementation Method 1
A rotary and revolutionary kneading process for a raw material composition without using a crushing medium and forming a coating layer on a surface of an active material
Implementation Method 2
A rotary and revolutionary kneading process for the raw material composition without using a crushing medium and forming the coating layer on the surface of the active material
Data Source
Figure 1~2
Figure 3
Figure 4A~4E
AI summary
The main object of the present invention is to provide a method of producing a coated active material capable of forming a coating layer while controlling damage to the active material surface. The present invention solves the problem by providing a method of producing a coated active material, the coated active material is provided with an active material and a coating layer containing a sulfide solid electrolyte, comprising the steps of: a preparation step of preparing a raw material composition containing the active material and the sulfide solid electrolyte, and a kneading step of performing a rotary and revolutionary kneading process for the raw material composition without using a crushing medium and forming the coating layer on the surface of the active material.