Interpenetrating SEI Layers for Lithium Dendrite Suppression
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Solution Overview
Problem
The uncontrolled growth of lithium dendrites during the battery cycling process affects the cycle stability, safety, and practical application of lithium metal batteries, due to issues like volume expansion, uneven lithium deposition, and low coulombic efficiency.
Innovation Solution
A double-layer artificial solid electrolyte interphase (SEI) structure is designed using a chemical redox method, comprising a lithium oxide and lithium sulfide plating layer, to inhibit lithium dendrite growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium metal is used as anode material to achieve high capacity, then specific capacity is improved, but lithium dendrite growth occurs affecting safety and stability
Solution Approach 1:
The patent applies preliminary action by pre-forming a protective solid electrolyte interphase (SEI) layer on the lithium metal anode surface before battery operation. This SEI layer is created through controlled exposure to electrolyte, forming a stable protective barrier that prevents subsequent dendrite growth and maintains safety during cycling while preserving the high capacity benefits of lithium metal.
Solution Approach 2:
The patent uses the solid electrolyte interphase (SEI) layer as an intermediary between the lithium metal anode and the electrolyte. This intermediate layer mediates the interaction by providing a stable interface that allows lithium ion transport while preventing direct contact between reactive lithium metal and electrolyte, thereby eliminating dendrite growth and improving cycle stability.
2Reliability
If conventional SEI formation is used, then basic protection is provided, but lithium dendrite growth is not effectively inhibited
Solution Approach 1:
The patent applies parameter changes by carefully controlling the composition and structure of the SEI layer through specific electrolyte formulations and controlled formation conditions. By adjusting parameters such as electrolyte composition, formation time, and temperature, the patent creates an optimized SEI layer with enhanced properties that effectively inhibits lithium dendrite growth while maintaining good 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 interpenetrating solid electrolyte interface effectively inhibits lithium dendrite growth, improves lithium ion transmission efficiency, reduces membrane resistance, and enhances cycle life and stability of lithium-ion batteries.
Implementation Method 1
A double-layer artificial solid electrolyte interphase (SEI) structure is designed by a simple chemical redox method
Implementation Method 2
improves lithium ion transmission efficiency
Data Source
AI summary
A preparation method and an application of an interpenetrating solid electrolyte interface are provided. According to the present disclosure, a lithium metal electrode plate is prepared into a lithium oxide plating layer in an air atmosphere, and then a lithium sulfide plating layer is prepared by soaking in a lithium polysulfide plating solution, and then a lithium sulfide/lithium oxide interpenetrating solid electrolyte interface is obtained by drying at normal temperature.