Porous Ion-Conductive Layer for Stable Solid-State Lithium Batteries
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Solution Overview
Problem
Current solid-state lithium batteries face challenges in achieving improved performance and safety due to limitations in the development of effective ion conductive layers, particularly in terms of ionic conductivity and stability, which hinder the widespread adoption of solid-state lithium metal anodes.
Innovation Solution
The development of a solid ion conductive layer incorporating a hygroscopic material, such as a halide-based material, combined with an organic material and ammonium halide, which is formed using a method that includes tape casting and subsequent processing steps like curing, heating, and sublimation to create a porous structure with enhanced ionic conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solid-state electrolytes are used, then safety is improved, but ionic conductivity is insufficient
Solution Approach 1:
The patent uses composite materials by combining inorganic solid ion conductive material particles with an organic material matrix. This composite structure allows the material to simultaneously achieve the safety benefits of solid-state electrolytes and the high ionic conductivity of liquid electrolytes, resolving the contradiction between safety and ionic conductivity.
Solution Approach 2:
The patent creates a porous structure within the organic material matrix that accommodates the inorganic solid ion conductive material particles. This porous architecture provides continuous pathways for ion transport while maintaining the structural integrity and safety advantages of the solid-state design, thus improving ionic conductivity without compromising safety.
2Quantity of substance
If solid-state electrolytes are used, then energy density is improved, but stability is insufficient
Solution Approach 1:
The composite structure combines the high energy density potential of solid-state batteries with the stability of the organic material matrix. The inorganic particles provide ion conductivity pathways while the organic matrix provides structural stability and chemical inertness, resolving the contradiction between energy density and stability.
Solution Approach 2:
The organic material acts as an intermediary between the inorganic solid ion conductive particles, providing a stable matrix that prevents direct contact and potential reactions between particles while maintaining ion transport pathways. This intermediary role enhances overall compositional stability while preserving energy density benefits.
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 proposed solution results in a solid ion conductive layer with improved ionic conductivity, chemical stability, and flexibility, facilitating the development of more efficient and safer solid-state lithium batteries with higher energy densities and faster charging times.
Implementation Method 1
The layer can include pores formed by sublimation of the ammonium halide
Implementation Method 2
The solid ion conductive layer can include an organic material and an inorganic solid ion conductive material
Data Source
AI summary
An ion conductive layer can include a hygroscopic ion conductive material, such as a halide-based material. In an embodiment, the ion conductive layer can include an organic material, ammonium halide, or a combination thereof.