Granulated All-Solid-State Battery Electrode for Moisture-Stable Conductivity
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Solution Overview
Problem
All-solid-state batteries face challenges such as moisture sensitivity of sulfide-based solid electrolytes, aggregation of active materials, and reduced porosity leading to decreased electrode performance.
Innovation Solution
The development of granules for the electrode, comprising a core with an active material, a first conductive material, and a binder, and a coating layer with a solid electrolyte and a second conductive material, which forms an excellent electrical network even under all-solid-state conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sulfide-based solid electrolyte is used to achieve high ionic conductivity, then ionic conductivity is improved, but moisture sensitivity increases causing H2S gas generation
Solution Approach 1:
The patent introduces a coating layer as an intermediary between the sulfide-based solid electrolyte and the external environment. This coating layer acts as a protective barrier that prevents direct contact between the moisture-sensitive solid electrolyte and moisture, thereby preventing H2S gas generation while maintaining the high ionic conductivity of the solid electrolyte.
Solution Approach 2:
The patent creates a protective environment around the sulfide-based solid electrolyte by using a coating layer that provides an inert barrier against moisture. This effectively isolates the harmful interaction between the solid electrolyte and moisture, allowing the system to maintain high ionic conductivity without the harmful effects of moisture sensitivity.
2Quantity of substance
If active materials are aggregated to improve electrode density, then energy density is improved, but porosity is reduced leading to decreased performance
Solution Approach 1:
The patent applies different properties to different parts of the electrode structure. The coating layer has different physical and chemical properties than the core active material, creating local quality variations. This allows the core to provide high density while the coating layer maintains porosity and facilitates ion transport, thereby resolving the contradiction between energy density and electrode performance.
Solution Approach 2:
The patent creates a composite granule structure consisting of a core active material and a coating layer. This composite structure combines the high density advantage of aggregated active materials with the porosity and ion transport benefits of the coating layer, thereby achieving both high energy density and maintained electrode performance.
3Reliability
If conductive materials are added to improve electrical connectivity, then electrical conductivity is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the coating layer: it provides protection against moisture, maintains porosity, and enhances electrical connectivity through the inclusion of conductive materials. By combining these functions in a single integrated layer rather than adding separate components, the patent improves electrical connectivity while minimizing increases in device complexity.
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 improves the performance of all-solid-state batteries by enhancing electrical connectivity, reducing resistance, and maintaining high energy density, while also addressing the moisture sensitivity of sulfide-based solid electrolytes.
Implementation Method 1
a first conductive material, a binder, and a coating layer comprising a solid electrolyte and a second conductive material are introduced to the electrode active material layer
Data Source
AI summary
An electrode for an all-solid-state battery is provided. The electrode comprises granules including a core containing an active material, a first conductive material, and a binder; and a coating layer containing a solid electrolyte and a second conductive material, and disposed in contact with an outside of the core, wherein the first and second conductive materials have different sizes or shapes from each other. The granules form an excellent electrical network in an interior of the granules even in the form of all-solid-state, thereby improving battery performance when applied as the electrode for an all-solid-state battery.