Metal Chalcogenide Interlayer for Lithium Metal Anode Adhesion
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Solution Overview
Problem
Secondary lithium batteries face challenges in maintaining uniform and sustained physical contact between electrodes and current collectors, leading to inefficient charge transport and potential delamination during battery operation.
Innovation Solution
A metal chalcogenide layer is formed between the lithium metal negative electrode and the current collector, enhancing adhesion and wetting, allowing for uniform lithium distribution and improved coulombic efficiency without increasing impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If lithium metal negative electrode is directly contacted with current collector, then simple structure is achieved, but uniform physical contact and adhesion are insufficient leading to delamination
Solution Approach 1:
An intermediate metal chalcogenide layer is introduced between the lithium metal negative electrode and the current collector. This intermediate layer acts as a mediator that enhances adhesion and promotes uniform physical contact, preventing delamination during battery operation while maintaining structural integrity.
Solution Approach 2:
The negative electrode assembly is structured as a composite system with three distinct layers: lithium metal layer, metal chalcogenide intermediate layer, and current collector. This composite structure combines the high capacity of lithium metal with the adhesion benefits of metal chalcogenides, achieving both strong bonding and uniform contact.
2Quantity of substance
If lithium metal layer is made thinner to improve energy density, then energy density increases, but uniform distribution and contact become more difficult to achieve
Solution Approach 1:
The metal chalcogenide intermediate layer serves as a template or mediator that facilitates uniform distribution of thin lithium metal layers. By providing a structured intermediate surface, it enables better control over lithium deposition and contact uniformity even when the lithium layer thickness is reduced to maximize energy density.
3Productivity
If conventional electrode-current collector contact is used, then manufacturing simplicity is maintained, but charge transport efficiency is insufficient
Solution Approach 1:
The metal chalcogenide intermediate layer acts as a conductive mediator that enhances charge transport between the lithium metal negative electrode and the current collector. This intermediate layer provides improved electrical contact and facilitates more efficient electron transfer, thereby increasing charge transport efficiency.
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 ensures robust bonding and uniform lithium distribution, preventing delamination and enhancing the energy density and efficiency of secondary lithium metal batteries.
Implementation Method 1
enhancing adhesion and wetting
Implementation Method 2
enhancing adhesion and wetting
Implementation Method 3
A surface of the metal substrate may be exposed to a chalcogen in gas phase such that a conformal metal chalcogenide layer forms on the surface of the metal substrate
Implementation Method 4
The lithium may actively wet the metal chalcogenide layer such that a conformal lithium metal layer forms on the surface of the metal substrate
Data Source
AI summary
An electrochemical cell comprising a lithium metal negative electrode layer physically and chemically bonded to a surface of a negative electrode current collector via an intermediate metal chalcogenide layer. The intermediate metal chalcogenide layer may comprise a metal oxide, a metal sulfide, a metal selenide, or a combination thereof. The intermediate metal chalcogenide layer may be formed on the surface of the negative electrode current collector by exposing the surface to a chalcogen in gas phase. Then, the lithium metal negative electrode layer may be formed on the surface of the negative electrode current collector over the intermediate metal chalcogenide layer by contacting at least a portion of the metal chalcogenide layer with a source of lithium such that the lithium actively wets the metal chalcogenide layer and forms a conformal lithium metal layer on the surface of the negative electrode current collector over the metal chalcogenide layer.