Composite Anode Interlayer for Dense Lithium Plating Control
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Solution Overview
Problem
Lithium metal batteries face issues with non-uniform lithium deposition and dendrite formation, leading to battery deterioration and potential short-circuiting due to large interfacial resistance and reactivity at the electrolyte/electrode interface, which limits their energy density and stability.
Innovation Solution
A composite interlayer comprising conductive carbon and a metal additive is introduced between the anode current collector and the electrolyte, where the metal additive satisfies the formula ηLi_depo_eff=−432.76*Eformation (eV)+0.0724*R (nm)+2.7824, promoting uniform lithium plating and suppressing dendrite formation by controlling lithium deposition overvoltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional lithium-ion battery uses organic liquid electrolytes, then ionic conductivity is maintained, but negative reactions with active materials occur leading to reduced stability
Solution Approach 1:
The patent introduces a composite interlayer as an intermediary between the electrolyte and anode current collector. This interlayer consists of conductive carbon and metal additives that form a stable interface, preventing direct contact and harmful reactions between the electrolyte and active materials while maintaining ionic conductivity pathways.
Solution Approach 2:
The patent employs a composite interlayer made of conductive carbon combined with metal additives (such as Al, Ag, Au, Cu, or their alloys). This composite structure leverages the electrical conductivity of carbon and the reactivity control properties of metal additives to achieve both stability and conductivity simultaneously.
2Quantity of substance
If lithium metal batteries use high energy density materials, then energy density increases, but un-uniform lithium plating and dendrite formation occur
Solution Approach 1:
The patent applies local quality modification by incorporating metal additives with specific properties (Al, Ag, Au, Cu or their alloys) into the conductive carbon matrix. These metal additives create localized regions with optimized lithium deposition characteristics, promoting uniform plating in critical areas while maintaining high energy density overall.
Solution Approach 2:
The patent changes the physical and chemical parameters of the anode interface by using a composite interlayer with controlled metal additive content and particle size distribution. This modifies the local electric field and lithium ion flux distribution, leading to more uniform lithium plating and suppression of dendrite formation.
3Productivity
If the electrolyte/electrode interface has high reactivity, then lithium deposition occurs, but large interfacial resistance and poor stability result
Solution Approach 1:
The composite interlayer serves as a mediator between the electrolyte and anode current collector, providing a stable interface that facilitates lithium deposition while preventing harmful reactions. The conductive carbon matrix with metal additives creates a stable platform that maintains both reactivity for lithium deposition and stability for long-term operation.
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 ensures dense, uniform lithium deposition with low overpotential, preventing short-circuiting and enhancing volumetric energy density by suppressing dendrite growth and improving electrochemical performance.
Implementation Method 1
The composite interlayer is configured to promote uniform lithium metal plating and suppressing dendrite formation
Implementation Method 2
Un-uniform lithium plating and formation of lithium dendrites contribute to the decrease in performance
Data Source
AI summary
A lithium metal battery cell has an electrolyte and an anode comprising an anode current collector and a composite interlayer formed on the anode current collector between the anode current collector and the electrolyte. The composite interlayer consists of conductive carbon and a metal additive, the composite interlayer configured to promote dense lithium deposition in the anode during charging. The metal additive in the composite interlayer is a metal that forms a solid solution with lithium metal.