Solid-State Battery Interlayer for Low-Resistance Lithium Interfaces
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Solution Overview
Problem
The interfacial contact and stability issues between lithium metal electrodes and solid electrolytes in solid-state batteries, particularly with garnet-type oxide electrolytes, result in poor performance due to rigid solid-solid interfaces and poor wettability, leading to high interfacial resistance and limited cycling life.
Innovation Solution
A magnesium-containing multilayer composite interlayer is introduced, comprising a magnesium layer adjacent to the anode and at least one metal layer between the magnesium layer and the solid electrolyte, which improves interfacial contact and stability by promoting lithium diffusion and reducing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid solid-solid interface is used between lithium metal electrode and solid electrolyte, then structural stability is improved, but interfacial contact and wettability deteriorate, leading to high interfacial resistance
Solution Approach 1:
A magnesium-containing multilayer composite interlayer is introduced as an intermediary between the lithium metal electrode and the solid electrolyte. This interlayer comprises a magnesium layer and at least one metal layer (such as aluminum, zinc, or their alloys), which mediates the interface to improve both contact quality and stability, resolving the contradiction between rigid structure and good interfacial contact.
Solution Approach 2:
The invention uses a composite multilayer structure combining magnesium with other metals (aluminum, zinc, or their alloys) to create a composite interlayer. This composite material approach allows optimization of both mechanical stability and interfacial wettability, achieving low interfacial resistance while maintaining structural integrity.
2Ease of manufacture
If a single-layer magnesium interlayer is used, then manufacturing simplicity is improved, but interfacial resistance and cycling stability deteriorate
Solution Approach 1:
The invention transitions from a single-layer magnesium interlayer to a composite multilayer structure combining magnesium with aluminum, zinc, or their alloys. This composite approach reduces interfacial resistance and improves cycling stability while remaining manufacturable through conventional deposition techniques.
Solution Approach 2:
The interlayer is segmented into multiple functional layers: a magnesium layer providing baseline performance and at least one additional metal layer (aluminum, zinc, or alloy) providing enhanced interfacial properties. This segmentation allows each layer to contribute specific functions, achieving superior overall performance.
3Use of energy by moving object
If garnet-type oxide electrolyte is used, then ionic conductivity is improved, but brittleness and interfacial contact deteriorate
Solution Approach 1:
The magnesium-containing multilayer composite interlayer serves as a mediator between the brittle garnet-type oxide electrolyte and the lithium metal electrode. This interlayer compensates for the brittleness of the solid electrolyte while preserving its high ionic conductivity, achieving both mechanical and electrochemical performance.
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 composite interlayer achieves negligible Li/garnet interfacial resistance of less than 0.2 Ω cm² at room temperature and a critical current density of 2.4 mA/cm², enhancing the performance and cycling life of solid-state batteries.
Implementation Method 1
improves interfacial contact and stability by promoting lithium diffusion and reducing resistance
Data Source
AI summary
A solid-state battery having a solid electrolyte, an anode configured to contain lithium when the solid-state battery is in a charged state, a magnesium layer positioned adjacent to the anode and between the anode and the solid electrolyte, and at least one metal layer positioned adjacent to the magnesium layer and between the magnesium layer and the solid electrolyte.