Carbon-Coated Sulfide Solid Electrolyte for Battery Electron Conductivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Solid state batteries require a solid electrolyte material with both excellent ion conductivity and electron conductivity to enhance battery performance, but existing materials face challenges in achieving high electron conductivity without using transition metals, which can lead to capacity degradation.
Innovation Solution
A solid electrolyte material is developed by forming a carbon coating layer on the surface of sulfide solid electrolyte particles, which improves electron conductivity without the need for transition metals, thereby enhancing the battery's power and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a carbon coating layer is formed on solid electrolyte particles to improve electron conductivity, then electron conductivity increases to 1×10−3 S/cm or higher, but the manufacturing process becomes more complex
Solution Approach 1:
The liquid component is applied to the solid electrolyte particle surface before the carbonization step, preparing the surface in advance for uniform carbon coating. This preliminary action simplifies the overall process by ensuring consistent coating formation during the subsequent heating step.
Solution Approach 2:
The manufacturing process utilizes the phase transition of the liquid component from liquid state to carbonized solid state through heating. This phase transition naturally forms the carbon coating layer, simplifying the manufacturing process by using a self-organizing chemical transformation rather than requiring complex deposition equipment.
2Manufacturing precision
If liquid component is carbonized to form carbon coating layer, then coating uniformity is improved, but additional heating step is required
Solution Approach 1:
The patent combines the carbonization step with the existing sintering or heating process used in solid electrolyte manufacturing. By merging these thermal processing steps, the additional time required for carbon coating is minimized, and the liquid component is carbonized during the same heating cycle used for electrolyte formation.
Solution Approach 2:
The liquid component undergoes carbonization through a controlled phase transition when heated, naturally forming a uniform coating. This self-organizing process during the heating step achieves high coating uniformity without requiring separate, time-consuming deposition operations.
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
The carbon-coated solid electrolyte material achieves electron conductivity of 1×10−3 S/cm or higher, improving battery performance and reducing the risk of capacity degradation, while also simplifying safety devices due to the absence of flammable organic solvents.
Implementation Method 1
a heating step of heating the solid electrolyte particle to carbonize the liquid component to form a carbon coating layer
Data Source
AI summary
A main object of the present invention is to provide a solid electrolyte material having excellent electron conductivity. The present invention solves the problem by providing the solid electrolyte material including: a solid electrolyte particle; and a carbon coating layer formed on a surface of the solid electrolyte particle.