Metal-Fluoride Coated Solid-State Electrolytes for Low-Resistance Interfaces
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Solution Overview
Problem
The interface between solid-state electrolytes and lithium metal negative electrodes in all-solid-state lithium batteries is prone to poor interfacial contact, leading to high interfacial resistance and dendrite formation, which can cause battery failure due to internal short circuits.
Innovation Solution
A process involving the deposition of a metal-based coating layer on the surface of solid-state electrolytes using rapid heating methods, such as Joule heating, followed by solidification, to enhance the interface with lithium metal electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid-state electrolyte is used to suppress dendrite growth, then battery safety is improved, but interfacial resistance increases leading to poor contact with lithium metal electrode
Solution Approach 1:
A thin coating layer of metal fluoride (such as LiF, NaF, KF, RbF, or CsF) is applied on the surface of the solid-state electrolyte to serve as an intermediary layer. This coating layer improves interfacial contact between the solid-state electrolyte and lithium metal electrode, reducing interfacial resistance while maintaining the dendrite-suppressing properties of the solid-state electrolyte.
Solution Approach 2:
The surface properties of the solid-state electrolyte are modified by changing the chemical composition at the interface through the application of metal fluoride coating. This parameter change in surface chemistry reduces the interfacial resistance without compromising the bulk properties and safety advantages of the solid-state electrolyte.
2Stability of the object's composition
If garnet-type solid electrolyte is used for wide electrochemical stability, then electrochemical stability is improved, but interfacial contact with lithium metal remains poor due to lithiophobic properties
Solution Approach 1:
The metal fluoride coating acts as a mediator between the lithiophobic garnet-type solid electrolyte and the lithium metal electrode. This intermediate layer facilitates better interfacial contact and reduces resistance while preserving the electrochemical stability window of the garnet-type electrolyte.
Solution Approach 2:
The bulk garnet-type solid electrolyte maintains its lithiophobic properties and wide electrochemical stability, while the surface is locally modified with metal fluoride coating to provide lithiophilic characteristics. This local quality change improves interfacial contact without affecting the overall electrochemical stability of the electrolyte.
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 process significantly reduces interfacial resistance, improving the stability and safety of all-solid-state lithium batteries by preventing dendrite formation and enhancing battery performance.
Implementation Method 1
subjecting the precursor powder of a metal-based coating material to a rapid heating method to produce a melted metal-based coating material
Implementation Method 2
produce a melted metal-based coating material
Implementation Method 3
solidifying the melted metal-based coating material to produce the coated solid-state electrolyte
Data Source
AI summary
The present technology relates to a process for producing a coated solid-state electrolyte comprising a metal-based coating layer deposited on at least a portion of a surface of a solid-state electrolyte, the process comprising the steps of: (i) depositing a precursor powder of a metal-based coating material on at least a portion of a surface of a solid-state electrolyte; (ii) subjecting the precursor powder of the metal-based coating material to a rapid heating method to produce a melted metal-based coating material; and (iii) solidifying the melted metal-based coating material to produce the coated solid-state electrolyte. Also described are coated solid-state electrolytes obtained by said process as well as electrochemical cells and batteries comprising said coated solid-state electrolytes. For instance, the battery can be a lithium battery or a lithium-ion battery.