Laser-Patterned Solid Electrolyte for Dendrite-Resistant Interfaces
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Solution Overview
Problem
Lithium-lanthanum-zirconium oxide-based solid electrolytes exhibit high interfacial resistance and lithium dendrite penetration at grain boundaries when used in lithium metal batteries, particularly under high current densities, leading to insufficient ionic conductivity and potential short circuits.
Innovation Solution
A solid electrolyte with an amorphous phase formed on the surface of a lithium ion inorganic conductive layer by irradiating it with a laser beam, creating a patterned amorphous film to increase surface area and reduce interfacial resistance, thereby suppressing lithium dendrite growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a lithium-lanthanum-zirconium oxide-based solid electrolyte is used in a lithium metal battery, then the battery can operate with high current density, but the solid electrolyte exhibits high interfacial resistance and lithium dendrite penetration at grain boundaries
Solution Approach 1:
The patent applies local quality by creating an amorphous phase specifically at the grain boundaries and surface regions of the solid electrolyte, while maintaining the crystalline structure in the bulk. This localized amorphous layer at critical interfaces reduces interfacial resistance and prevents dendrite penetration without compromising the overall structural integrity and ionic conductivity of the crystalline regions
Solution Approach 2:
The patent creates a composite structure consisting of crystalline lithium-lanthanum-zirconium oxide phases combined with an amorphous phase at the grain boundaries and surface. This composite microstructure leverages the high ionic conductivity of the crystalline regions while the amorphous regions provide enhanced interface compatibility and dendrite resistance, resolving the contradiction between productivity and reliability
2Reliability
If the solid electrolyte is modified to reduce interfacial resistance, then ionic conductivity improves, but the structural stability and chemical compatibility may be compromised
Solution Approach 1:
The patent applies parameter changes by modifying the local atomic arrangement and phase structure at the grain boundaries and surface regions, transforming crystalline regions into an amorphous phase. This parameter change in the local structure improves ionic conductivity and interfacial compatibility while the bulk crystalline structure maintains structural stability and chemical composition integrity
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 modified solid electrolyte reduces interfacial resistance and prevents short circuits, enhancing the rate performance and lifespan of lithium batteries.
Implementation Method 1
irradiating it with a laser beam, creating a patterned amorphous film
Implementation Method 2
form an amorphous phase on a surface of the lithium ion inorganic conductive layer
Data Source
AI summary
A solid electrolyte including: a lithium ion inorganic conductive layer; and an amorphous phase on a surface of the lithium ion inorganic conductive layer, wherein the amorphous phase is an irradiation product of the lithium ion inorganic conductive layer. Also, the method of preparing the same, and a lithium battery including the solid electrolyte.