Layered Solid Electrolyte Microstructure for Lithium Dendrite Blocking
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Solution Overview
Problem
Conventional sintered ceramic solid-state electrolytes in lithium batteries suffer from metal dendrite formation due to electron conduction through grain boundaries, leading to battery failure, as grain boundaries are randomly oriented and act as fast electron channels.
Innovation Solution
A solid-state electrolyte membrane with an interlocking layered microstructure is formed by melting and spraying ionic conductive materials, which blocks electron migration and suppresses metal dendrite formation by orienting grain boundaries perpendicular to the electric field, using materials like garnet-structure oxides, NASICON, perovskite, or argyrodite structured sulfides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventionally sintered ceramic solid-state electrolyte with close packed hexagonal grain structure is used, then manufacturing process is simple, but grain boundaries act as fast electron conductive channels leading to metal dendrite formation
Solution Approach 1:
The electrolyte membrane is divided into multiple layered grains with controlled orientations. Each layer's grain boundaries are segmented to block electron conduction paths, preventing continuous electron channels that lead to dendrite formation. The segmentation creates a multi-layered defense against electron migration while maintaining ionic conductivity.
Solution Approach 2:
The patent introduces asymmetric grain boundary orientation where layers are deliberately arranged with specific angular relationships (e.g., 45-degree angles between adjacent layers). This asymmetric structure disrupts the random orientation of conventional sintered ceramics, creating preferential blocking of electron conduction paths while allowing ion transport. The asymmetry prevents electrons from finding continuous pathways through the membrane.
2Ease of manufacture
If grain boundaries are randomly oriented in conventional sintered ceramics, then manufacturing is straightforward, but electron conduction occurs along grain boundaries parallel to electric field
Solution Approach 1:
The patent transitions from two-dimensional random grain boundary networks to three-dimensional layered structures with controlled orientations. By stacking multiple layers with specific angular relationships, the solution adds a dimensional control element that blocks electron conduction in the direction parallel to the electric field. This multi-layered approach creates tortuous electron paths while maintaining straightforward manufacturing through layer-by-layer assembly.
3Reliability
If interlocking layered microstructure with controlled grain boundary orientation is implemented, then electron migration is blocked suppressing dendrite formation, but manufacturing complexity increases
Solution Approach 1:
The patent controls specific parameters of the layered structure including grain size, layer thickness, and inter-layer angles (e.g., 45 degrees). By optimizing these parameters, the complex microstructure achieves effective electron blocking without requiring excessively fine or irregular features. The parameter control enables reproducible dendrite suppression through standardized manufacturing processes rather than complex adaptive structures.
4Object-generated harmful factors
If layered structure blocks electron conduction, then metal dendrite formation is suppressed, but ionic conductivity may be affected
Solution Approach 1:
The patent creates different local properties within the electrolyte membrane: regions with blocked electron conduction (at grain boundaries and layer interfaces) and regions with open ion transport paths (within grain interiors). The layered structure provides local electron blocking at interfaces while maintaining bulk ionic conductivity through the grain interiors. This spatial differentiation of properties allows simultaneous suppression of dendrites and preservation of ionic conductivity.
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 interlocking layered structure effectively prevents metal dendrite penetration and propagation, enhancing battery performance and safety by suppressing electron conduction across the membrane.
Implementation Method 1
layered grain boundaries may block the migration of electrons across the membrane suppressing metal dendrite formation in the presence of an electric field
Implementation Method 2
an interlocking layered microstructure formed by melting and spraying of ionic conductive material
Implementation Method 3
an interlocking layered microstructure formed by melting and spraying of ionic conductive material
Data Source
AI summary
A solid-state electrolyte membrane includes an interlocking layered microstructure formed by melting and spraying of ionic conductive material for use in a battery system.