Anode Current Collector Thin-Film Layer for Uniform Lithium Plating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium metal batteries face issues with non-uniform lithium deposition, leading to dendrite formation, short circuiting, and reduced performance due to large interfacial resistance and compatibility problems at the electrolyte/electrode interface, limiting their energy density and adoption.
Innovation Solution
A modified anode current collector with a thin film of metal applied directly to the electrolyte-facing side, which promotes dense and uniform lithium plating, suppressing dendrite formation and improving coulombic efficiency, using metals that form a solid solution with lithium and have low overpotentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional lithium-ion batteries use organic liquid electrolytes, then ionic conductivity is achieved, but negative reactions with active materials occur
Solution Approach 1:
A thin film metal layer is introduced as an intermediary between the lithium metal anode and the electrolyte. This intermediate layer prevents direct contact and harmful reactions between the electrolyte and active materials while maintaining ionic conductivity, thus resolving the contradiction between achieving ionic conductivity and preventing negative reactions.
2Stability of the object's composition
If ionic liquid electrolytes are used, then chemical stability is improved, but viscosity increases and ionic conductivity decreases
Solution Approach 1:
The thin film metal layer provides locally optimized properties at the electrode-electrolyte interface. It enables the system to use chemically stable ionic liquid electrolytes while the metal layer compensates for the increased viscosity by providing a stable platform that maintains effective ionic transport, thus resolving the contradiction between chemical stability and ionic conductivity.
3Quantity of substance
If lithium metal anodes are used, then energy density is increased, but non-uniform lithium plating and dendrite formation occur
Solution Approach 1:
The thin film metal layer serves as an intermediary that mediates lithium deposition. It provides a controlled interface that guides uniform lithium plating, preventing dendrite formation while enabling the use of high-capacity lithium metal anodes, thus resolving the contradiction between energy density and plating uniformity.
4Quantity of substance
If lithium metal batteries are used, then energy density is improved, but interfacial resistance at the electrolyte/electrode interface increases
Solution Approach 1:
The thin film metal layer changes the interfacial parameters by providing a stable, low-resistance contact between the lithium metal anode and the electrolyte. This parameter modification enables high energy density lithium metal batteries to operate with reduced interfacial resistance, resolving the contradiction between energy density and interfacial resistance.
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 solution enables quick charging and enhanced energy density by ensuring dense, uniform lithium deposition, reducing the risk of short circuiting and improving battery performance with metals like Pt, Al, Au, Mg, Ag, and Zn, which have overpotentials less than 8 mV, resulting in improved coulombic efficiency and extended battery life.
Implementation Method 1
the thin film metal layer consisting of a metal that forms a solid solution with lithium metal
Data Source
AI summary
A lithium metal battery cell has an electrolyte and an anode comprising an anode current collector and a thin film metal layer formed on the anode current collector, the thin film metal layer consisting of a metal that forms a solid solution with lithium metal. The thin film metal layer is configured to promote dense lithium deposition between the thin film metal layer and the electrolyte during charging.