Lithium Metal Negative Electrode Coating for Dendrite Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium metal batteries face challenges due to the high reactivity of lithium metal, leading to low coulombic efficiency, short lifespan, and safety concerns such as dendrite growth and internal short circuits, which hinder their commercialization.
Innovation Solution
A protective layer composed of a polymer of alpha lipoic acid and sulfur, an inorganic sulfide-based compound, and an inorganic nitride/nitrate-based compound is formed on the lithium metal negative electrode to suppress dendrite growth and enhance the reversibility of electrodeposition and desorption reactions, thereby improving the battery's lifetime and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal is used as negative electrode active material, then high theoretical capacity and low standard reduction potential are achieved, but high reactivity leads to low coulombic efficiency and short lifespan
Solution Approach 1:
A protective layer comprising a polymer of alpha lipoic acid and sulfur molecule is formed on the lithium metal negative electrode as an intermediary substance. This protective layer mediates between the highly reactive lithium metal and the electrolyte, preventing direct harmful interactions while allowing electrochemical reactions to proceed, thereby improving coulombic efficiency and lifespan
2Use of energy by moving object
If lithium metal is used as negative electrode active material, then high theoretical capacity is achieved, but dendrite growth causes safety problems such as internal short circuits
Solution Approach 1:
The protective layer is formed in advance on the lithium metal negative electrode surface before dendrites can grow. This preliminary protective coating prevents the formation and growth of dendritic structures by providing a uniform interface that directs lithium ion deposition, thereby eliminating the safety hazard of internal short circuits while preserving the high capacity benefit
3Reliability
If protective layer is formed on lithium metal negative electrode, then dendrite growth is suppressed and safety is improved, but additional components increase device complexity
Solution Approach 1:
The protective layer is constructed as a composite material comprising a polymer of alpha lipoic acid and sulfur molecule, along with inorganic sulfide-based compounds and inorganic nitride/nitrate-based compounds. This composite structure provides enhanced protective functionality including dendrite suppression and improved interfacial stability, achieving high safety performance through material composition rather than complex structural design
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 protective layer effectively stabilizes the lithium metal negative electrode, reducing resistance and enhancing the battery's performance by preventing dendrite growth and improving the efficiency of electrochemical reactions, thus extending the battery's lifespan and ensuring safety.
Implementation Method 1
a stable protective layer is formed on one surface or both surfaces of the lithium metal negative electrode, so as to suppress the growth of dendrites on the surface
Implementation Method 2
the electrodeposition and desorption reaction of lithium metal in the lower part of the protective layer is reversibly performed with excellent efficiency
Implementation Method 3
the electrodeposition and desorption reaction of lithium metal in the lower part of the protective layer is reversibly performed with excellent efficiency
Data Source
AI summary
A lithium metal negative electrode and a lithium metal battery including the lithium metal negative electrode. The lithium metal negative electrode includes a protective layer present on at least one surface of the negative electrode for stabilizing between the lithium metal and the electrolyte. The protective layer includes a polymer of alpha lipoic acid (ALA) and sulfur molecule (S8), a depolymerized product of the polymer, an inorganic sulfide-based compound, and at least one of an inorganic nitride-based compound, or an inorganic nitrate-based compound.