Aromatic Diluent Electrolyte for Uniform Lithium Metal Deposition
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Solution Overview
Problem
Lithium metal batteries face issues with lithium dendrite growth and unstable cycle performance due to uneven deposition and high costs of conventional electrolytes, limiting their commercialization and cycle life.
Innovation Solution
A lithium metal battery electrolyte containing an aromatic compound as a diluent, which improves solvation structure and inhibits dendrite growth by reducing local current density, enhancing conductivity, and reducing costs through the use of low-cost, high-miscibility aromatic compounds like fluorobenzene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes are used in lithium metal batteries, then the battery can operate, but lithium dendrites grow and cycle performance deteriorates due to uneven lithium deposition
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing aromatic compounds (such as benzene, toluene, xylene) as additives. These aromatic compounds modify the solvation structure and deposition characteristics of lithium ions, transforming the electrolyte's properties to promote uniform lithium deposition and inhibit dendrite formation, thereby improving cycle performance while maintaining battery operation.
Solution Approach 2:
The aromatic compounds act as intermediary substances between the lithium ions and the electrode surface. They mediate the deposition process by forming a modified interface layer that guides uniform lithium ion distribution, preventing direct contact between lithium ions and the electrode that would lead to dendritic growth, thus enhancing reliability without compromising functionality.
2Speed
If polysulfide (Li2Sx) is added to the electrolyte to form a stable SEI film, then lithium-ion transportation rate increases, but the additive performance cannot be maintained after continuous consumption
Solution Approach 1:
The aromatic compounds in the electrolyte enable the system to self-regulate and continuously regenerate the protective interface layer. Rather than relying on a consumable additive that depletes over time, the aromatic compounds are present in sufficient concentration to continuously supply the necessary species for maintaining a stable SEI film and uniform deposition surface, allowing the beneficial effects to persist throughout the battery's operational life.
3Object-generated harmful factors
If polyfluoroether is used as a diluent to improve solvation structure and uniformize lithium metal deposition, then dendrite growth is inhibited, but the high cost makes it difficult to use in actual production
Solution Approach 1:
The patent replaces the expensive polyfluoroether diluent with inexpensive aromatic compounds (benzene, toluene, xylene and their derivatives) that are readily available and cost-effective. These aromatic compounds achieve the same functional effect of uniformizing lithium deposition and inhibiting dendrites, but at a fraction of the cost, making the technology economically viable for large-scale production while maintaining the desired performance characteristics.
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 aromatic compound diluent in the electrolyte promotes uniform lithium deposition, increases cycle life, and reduces production costs, enabling stable and efficient lithium metal battery performance with improved Coulombic efficiency and energy density.
Implementation Method 1
a solvation structure of a lithium salt in the electrolyte is improved to accelerate lithium-ion transportation
Implementation Method 2
a degree of uneven local current density on a surface of lithium metal is reduced, and lithium metal deposition is uniformized, so that growth of dendrites on the surface of the lithium metal is inhibited
Implementation Method 3
the electrolyte has high conductivity, low viscosity, and good wettability, Coulombic efficiency of the lithium metal battery may be effectively improved
Implementation Method 4
the electrolyte has high conductivity, low viscosity, and good wettability
Data Source
AI summary
The present invention relates to the technical field of lithium metal batteries, and relates to a lithium metal battery electrolyte containing an aromatic compound as a diluent. The electrolyte contains a lithium salt, a solvent for dissolving the lithium salt, and a diluent; the diluent is an aromatic compound, and the diluent is used for inhibiting lithium dendrites generated due to uneven deposition of a lithium metal anode in the lithium metal battery during a cycle process, and is used for inhibiting the lithium metal anode in the lithium metal battery from reacting with the electrolyte.