Single-Crystalline Electrolyte Growth for Solid-State Battery Safety
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Solution Overview
Problem
Conventional thin-film solid-state batteries with polycrystalline solid-state electrolytes suffer from low ionic conductivities due to grain boundaries, leading to Li-dendrite formation and high interface resistance, which limits their performance and safety.
Innovation Solution
The fabrication of single-crystalline ionically conductive materials grown on a two-dimensional material over a growth substrate, allowing for the formation of a freestanding electrolyte with reduced grain boundaries and enhanced ionic conductivity, which is then used in electrochemical cells with electrodes disposed on both sides of the electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polycrystalline solid-state electrolytes are used, then the battery can be manufactured with conventional deposition and annealing methods, but the ionic conductivity is low due to grain boundaries and boundary junctions
Solution Approach 1:
The patent changes the crystal structure parameter from polycrystalline to single-crystalline, eliminating grain boundaries and boundary junctions that impede ionic conductivity. This structural parameter change enables high ionic conductivity while maintaining manufacturability through controlled crystallization processes.
Solution Approach 2:
The patent creates a composite structure combining single-crystalline electrolyte material with carefully engineered grain boundary regions or surface treatments. This composite approach maintains the benefits of single-crystal ionic pathways while managing manufacturing complexity through controlled interface engineering.
2Ease of manufacture
If polycrystalline solid-state electrolytes are used, then the fabrication process is simpler, but Li-dendrite formation occurs through grain boundaries causing short-circuits
Solution Approach 1:
The patent changes the microstructural parameter from polycrystalline to single-crystalline, eliminating grain boundaries that serve as pathways for Li-dendrite penetration. This parameter change fundamentally blocks the harmful dendrite growth pathways while maintaining fabrication feasibility through controlled crystallization.
Solution Approach 2:
The patent converts the manufacturing advantage of polycrystalline materials into a benefit by using controlled crystallization processes that produce single-crystalline structures. The simplified fabrication approach is redirected toward epitaxial growth or controlled annealing methods that yield single crystals, transforming the manufacturing simplicity advantage into both ease of production and safety improvements.
3Ease of manufacture
If rough surface contact between solid-state electrolyte and electrodes is used, then the electrode assembly is easier to manufacture, but interface resistance increases reducing Coulombic efficiency
Solution Approach 1:
The patent changes the surface morphology parameter from rough to atomically smooth, eliminating interface defects and contact resistance sources. This surface quality improvement enhances Coulombic efficiency while maintaining assembly ease through integrated growth processes that produce smooth surfaces directly.
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 approach results in high ionic conductance, fast charging and discharging rates, and improved safety by preventing Li-dendrite penetration, while also reducing bulk resistance and increasing energy density.
Implementation Method 1
forming a single-crystalline ionically conductive material on a two-dimensional (2D) material that is disposed over a growth substrate
Data Source
AI summary
The fabrication of single-crystalline ionically conductive materials and related articles and systems are generally described.