Sulfide-Coated Battery Electrode Granules for Moisture-Stable Ion Transport
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Solution Overview
Problem
All-solid-state batteries face challenges with sulfide-based solid electrolytes, including sensitivity to moisture and poor cohesion with active materials, which affects battery performance and safety.
Innovation Solution
The development of granules coated with a sulfide-based solid electrolyte, comprising an active material, carbon nanotubes as an electrically conductive material, and a binder, specifically designed to improve interaction and ion conductivity, with a structured distribution of carbon nanotubes and a controlled porosity to enhance electrode performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sulfide-based solid electrolyte is used, then ion conductivity is improved, but moisture sensitivity worsens
Solution Approach 1:
A coating layer comprising a sulfide-based solid electrolyte is applied to the surface of granules (active material particles). This coating layer acts as an intermediary that provides high ion conductivity for battery performance while protecting the underlying active material from moisture sensitivity and degradation.
2Quantity of substance
If porosity is reduced to improve cohesion, then electrode density is improved, but ion transport pathways may be reduced
Solution Approach 1:
The granules are designed with controlled porosity within the particle interior while maintaining a dense coating layer on the surface. This local differentiation allows the interior to provide cohesion and structural integrity, while the surface coating ensures ion conductivity and protection, resolving the contradiction between density and ion transport.
3Reliability
If carbon nanotubes with diameter of 1 nm to 10 nm are used, then electrical conductivity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies a particular diameter range (1 nm to 10 nm) for the carbon nanotubes used in the granule composition. By defining this specific parameter range, the invention optimizes electrical conductivity while providing clear manufacturing guidelines that balance performance requirements with manufacturing feasibility.
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 configuration enhances the interaction between the active material and the sulfide-based solid electrolyte, improving the battery's performance by increasing ion conductivity and reducing porosity, thereby enhancing the overall efficiency and safety of the all-solid-state battery.
Implementation Method 1
the electrically conductive material is carbon nanotubes having a diameter of 1 nm to 10 nm
Implementation Method 2
granules coated with a sulfide-based solid electrolyte, wherein the granule comprises an active material, an electrically conductive material
Data Source
AI summary
The present disclosure provides an electrode for an all-solid-state battery comprising granules coated with a sulfide-based solid electrolyte. The granules comprise an active material, an electrically conductive material, and a binder, and the electrically conductive material is carbon nanotubes having a diameter of 1 nm to 10 nm. The carbon nanotubes have a BET specific surface area of 400 m2/g to 1000 m2/g. When the electrode for the all-solid-state battery is applied to the all-solid-state battery, the performance of the battery can be improved.