Composite Ion Conductive Layer for Stable Fast-Charging Solid-State Batteries
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Solution Overview
Problem
Existing solid-state lithium batteries face challenges in achieving improved performance, particularly in terms of ionic conductivity and stability, which limits their energy density and recharging capabilities.
Innovation Solution
The development of an ion conductive layer comprising an inorganic solid ion conductive material and an organic material, with a controlled thickness and porosity, utilizing a hygroscopic material like halide-based materials and ammonium halides to enhance ionic conductivity and stability, and incorporating a binder to ensure compatibility and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If solid-state electrolytes are used to enable lithium metal anode, then energy density and recharging speed are improved, but ionic conductivity and stability are insufficient
Solution Approach 1:
The patent applies composite materials by combining inorganic solid ion conductive materials (such as halide-based materials, sulfide-based materials, or oxide-based materials) with organic materials (such as polymers or small molecules) to form a composite solid-state electrolyte. This composite structure leverages the high ionic conductivity of inorganic materials while the organic component provides flexibility, stability, and processability, thereby resolving the contradiction between achieving high recharging speed and maintaining ionic conductivity stability.
Solution Approach 2:
The patent employs parameter changes by systematically optimizing the composition ratios, molecular weights, and crosslinking densities of the organic and inorganic components. By adjusting these parameters, the electrolyte achieves optimal balance between ionic conductivity (for fast recharging) and structural stability (for reliability), directly addressing the technical contradiction.
2Quantity of substance
If solid-state electrolytes are used to improve battery performance, then energy density increases, but manufacturing complexity and material stability challenges arise
Solution Approach 1:
The patent utilizes porous materials by incorporating porous structures into the solid-state electrolyte composite. The porous architecture increases the surface area and provides pathways for ion transport, enhancing energy density while the controlled porosity allows for better infiltration of lithium metal anode materials, simplifying the manufacturing process compared to dense structures.
Solution Approach 2:
The organic component acts as an intermediary between the inorganic solid ion conductive material and the lithium metal anode. This intermediary layer improves interfacial compatibility, reduces manufacturing complexity by enabling simpler processing techniques, and enhances overall stability without compromising energy density.
3Reliability
If hygroscopic materials like halide-based materials are used to enhance ionic conductivity, then conductivity improves, but moisture sensitivity and stability decrease
Solution Approach 1:
The patent applies the taking out principle by carefully selecting and extracting only the most ionic-conductive inorganic phases while minimizing the hygroscopic content. The organic matrix is chosen to provide a protective environment that extracts or isolates the hygroscopic inorganic materials from moisture exposure, thereby maintaining high ionic conductivity while reducing moisture sensitivity.
Solution Approach 2:
The patent creates an inert environment by using organic materials with low moisture affinity and designing the composite structure to protect the hygroscopic inorganic components from atmospheric moisture. This inert environment approach allows the use of high-conductivity halide-based materials while mitigating their inherent moisture sensitivity through the protective organic matrix.
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 ion conductive layer achieves improved ionic conductivity, flexibility, and stability, enhancing the performance of solid-state lithium batteries by facilitating faster charging and higher energy densities.
Implementation Method 1
a solid ion conductive layer, devices including the same, and methods of forming the same
Data Source
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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.