Sulfide Solid Electrolyte Doping for Stable Alloy Interfaces
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Solution Overview
Problem
Solid-state lithium batteries with solid electrolytes face impedance issues at the electrolyte-metal interface and increased production costs due to the need for additional processing to enhance ionic conductivity and moisture resistance.
Innovation Solution
A method involving a sulfide solid electrolyte doped with an anode-philic material, such as antimony, is used to form an alloy at the anode-electrolyte interface after a charge/discharge cycle, improving the interface stability and reducing electronic conductivity while maintaining high ionic conductivity and moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolytes are used to improve safety, then safety is improved, but interface impedance occurs between solid electrolyte and lithium metal
Solution Approach 1:
An aluminum layer is introduced as an intermediary between the solid electrolyte and lithium metal anode. This aluminum intermediary layer prevents direct contact and impedance between the solid electrolyte and lithium metal, while still allowing ionic conduction. The aluminum layer acts as a mediator that resolves the interface impedance problem while maintaining the safety benefits of solid electrolytes.
Solution Approach 2:
The battery structure uses a composite design with multiple layers including solid electrolyte, aluminum intermediary layer, and lithium metal anode. This composite structure combines the safety advantages of solid electrolytes with the low impedance characteristics of the aluminum-lithium interface, creating a system that benefits from both materials.
2Reliability
If additional techniques are added to improve ionic conductivity and moisture resistance, then performance is improved, but production cost increases
Solution Approach 1:
The solid electrolyte composition is designed to self-stabilize at the interface with lithium metal through the aluminum intermediary layer. The system automatically forms a stable interface configuration during battery operation, eliminating the need for additional post-processing techniques to improve stability and conductivity, thereby reducing manufacturing complexity and cost.
Solution Approach 2:
The invention changes the chemical composition parameters of the solid electrolyte by incorporating specific ratios of lithium phosphorus oxynitride and aluminum. This parameter adjustment inherently provides both high ionic conductivity and moisture resistance without requiring additional processing steps, thus improving performance while controlling production cost.
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 significantly extends the service life of solid-state batteries by stabilizing the electrolyte interface, reducing internal leakage risks, and enhancing moisture resistance, as demonstrated by improved cycle stability and conductivity results.
Implementation Method 1
an alloy formed at an interface between the anode and the doped sulfide solid electrolyte by the anode-philic material and the anode metal after conducting at least one charge/discharge cycle of the solid-state battery
Implementation Method 2
after conducting at least one charge/discharge cycle of the solid-state battery
Implementation Method 3
to take in to account the ionic conductivity and reducing the electrolyte electronic conductivity simultaneously, to avoid internal electricity leakage
Data Source
AI summary
Present invention provides an innovative alloy formation method for a solid state battery and the sold state battery thereof. The said sulfide solid-state electrolyte is doped with anode-philic material to replace the cation ion when synthesizing the sulfide solid-state electrolyte to improve its ionic conductivity but reduce the electronic conductivity avoiding internal electricity leakage. The present invention can also increase the moisture resistance for the sulfide solid-state electrolyte. After performing life cycles, an alloy is formed on an interface of the sulfide solid-state electrolyte which could stabilize and prolongs the life cycles of the full battery.