Multilayer Solid Electrolyte With Interlayer for Low Interface Resistance
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Solution Overview
Problem
Existing electrolyte materials fail to meet the requirements of high conductivity, wide electrochemical window, and non-flammability simultaneously, making it difficult to form a single electrolyte that meets all these criteria.
Innovation Solution
A multilayer solid electrolyte comprising a FeOCl—LiCl layer, a LLZO layer, and an intermediate layer containing lithium, oxygen, and at least one of phosphorous and carbon, which reduces interfacial resistance and enhances compatibility between the FeOCl—LiCl and LLZO layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single electrolyte material is used, then the structure is simple, but it is difficult to meet all requirements of high conductivity, wide electrochemical window, and non-flammability simultaneously
Solution Approach 1:
The patent employs composite materials by combining FeOCl-LiCl layer and LLZO layer in a multilayer structure. The FeOCl-LiCl layer provides high conductivity and non-flammability, while the LLZO layer provides wide electrochemical window. This composite approach allows the electrolyte to meet multiple performance requirements simultaneously that cannot be achieved with a single material.
Solution Approach 2:
The electrolyte is segmented into multiple functional layers: a FeOCl-LiCl layer and a LLZO layer, with an intermediate layer between them. Each layer is optimized for specific functions - the FeOCl-LiCl layer for conductivity and safety, the LLZO layer for electrochemical stability, and the intermediate layer for interface compatibility. This segmentation resolves the contradiction by distributing different performance requirements across separate layers.
2Adaptability or versatility
If FeOCl—LiCl and LLZO layers are combined directly, then both high conductivity and wide electrochemical window are achieved, but chemical reactions occur at the interface increasing interfacial resistance
Solution Approach 1:
An intermediate layer comprising lithium, oxygen, and at least one of phosphorous or carbon is introduced between the FeOCl-LiCl layer and the LLZO layer. This intermediate layer acts as a mediator that suppresses chemical reactions at the interface between the two electrolyte layers, thereby reducing interfacial resistance and improving interfacial stability while allowing both functional layers to maintain their performance benefits.
3Reliability
If an intermediate layer is added to reduce interfacial resistance, then interfacial stability is improved, but the device complexity increases
Solution Approach 1:
The intermediate layer is strategically placed only at the critical interface region between the FeOCl-LiCl and LLZO layers where chemical reactions occur. This localized approach addresses the interfacial stability issue specifically without requiring modification of the entire electrolyte structure. The intermediate layer has specific compositional characteristics (lithium, oxygen, and phosphorous or carbon) tailored for interface compatibility while keeping the bulk properties of the main electrolyte layers intact.
Data Source
AI summary
A solid electrolyte comprises a lithium lanthanum zirconium oxide (LLZO) solid electrolyte layer, a FeOCl—LiCl solid electrolyte layer, and an intermediate layer disposed between the LLZO layer and the FeOCl—LiCl layer. The intermediate layer comprises lithium (Li), oxygen (O), and at least one of phosphorous (P) and carbon (C).