Current Collector Barrier Coating for Molten Lithium Anodes
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Solution Overview
Problem
Current methods for manufacturing anode electrodes for battery cells result in the dissolution of the current collector material, such as copper, when immersed in molten lithium, leading to intergranular attack and contamination of the lithium bath, which affects the energy density and efficiency of the battery cells.
Innovation Solution
A method involving the coating of current collectors with a layer of metal or metal oxide that is not miscible in molten lithium, such as zinc, nickel, or their oxides, prior to immersion in molten lithium, thereby preventing intergranular attack and dissolution of the current collector material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If current collector is immersed in molten lithium to form lithium anode electrode, then lithium metal coats the current collector, but the current collector material dissolves and causes intergranular attack
Solution Approach 1:
A protective coating layer comprising metal (such as zinc, nickel, or their alloys) or metal oxide is applied to the current collector surface before lithium immersion. This intermediary layer prevents direct contact between molten lithium and the current collector base metal, eliminating dissolution and intergranular attack while allowing lithium to coat the protective layer.
2Quantity of substance
If current collector is immersed in molten lithium, then lithium anode electrode is formed, but the lithium bath becomes contaminated
Solution Approach 1:
The protective coating layer acts as a barrier between the current collector base metal and the lithium bath, preventing dissolution of copper or other current collector materials into the lithium. This eliminates contamination of the lithium bath while maintaining the lithium anode electrode formation process.
3Reliability
If protective coating layer is applied to current collector, then dissolution is prevented, but manufacturing process becomes more complex
Solution Approach 1:
The protective coating is applied as a thin layer (optimized thickness range) to balance protection effectiveness with process simplicity. The coating materials (zinc, nickel, or their alloys/oxides) are selected for their compatibility with standard deposition techniques and their ability to provide adequate protection at minimal thickness, reducing process complexity.
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 coated current collectors effectively prevent the dissolution of the base metal in molten lithium, maintaining the structural integrity of the current collector and enhancing the energy density and efficiency of the lithium anode electrodes.
Implementation Method 1
forming a layer on the current collector to create a coated current collector. The layer includes one of a metal and a metal oxide that is not miscible in molten lithium
Implementation Method 2
The coated current collectors effectively prevent the dissolution of the base metal in molten lithium, maintaining the structural integrity of the current collector
Data Source
AI summary
A method for manufacturing an anode electrode for a battery cell includes providing a current collector; and forming a layer on the current collector to create a coated current collector. The layer includes one of a metal and a metal oxide that is not miscible in molten lithium. The method includes immersing the coated current collector in molten lithium to coat the coated current collector.