Lithium-Sulfur Battery Electrolyte With Li6S2 for Shuttle Suppression
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Solution Overview
Problem
Lithium-sulfur batteries face issues such as the 'shuttle phenomenon' due to lithium polysulfide dissolution, poor conductivity, dendrite formation, and electrode expansion, which lead to performance deterioration and environmental pollution from discarded electrolyte solutions.
Innovation Solution
An electrolyte solution for lithium-sulfur batteries is developed, comprising an organic solvent (1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether and 1,3-dioxolane), a lithium salt (bis(hexafluoroethane) sulfonamide lithium salt or LiCF3SO3), and an additive (Li6S2), which improves conductivity and reduces polysulfide shuttle behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used in lithium-sulfur batteries, then the battery can operate, but lithium polysulfide dissolution occurs causing the shuttle phenomenon, serious corrosion of metal lithium, and performance deterioration
Solution Approach 1:
The patent introduces a functional intermediate layer containing Li6S2 particles suspended in the electrolyte solution. This intermediate layer acts as a mediator that selectively adsorbs lithium polysulfides, preventing their dissolution and shuttle phenomenon while allowing lithium ion transport. The intermediate layer thus resolves the contradiction by providing a beneficial intermediary substance that eliminates harmful effects without compromising battery operation.
Solution Approach 2:
The patent modifies the electrolyte solution composition by adding specific concentrations of Li6S2 (0.1-10 mmol/L) and adjusting the solvent ratio (cyclic carbonate 10-30%, chain carbonate 70-90%). These parameter changes transform the electrolyte's properties to reduce polysulfide solubility and prevent shuttle phenomenon, thereby improving reliability while eliminating harmful effects.
2Quantity of substance
If lithium-sulfur batteries are operated for extended periods, then energy storage capacity is achieved, but electrode expansion occurs due to large density difference between charged and discharged products
Solution Approach 1:
The patent applies local quality by creating a functional intermediate layer with specific local properties (Li6S2 particle distribution, selective adsorption capacity) at the electrode-electrolyte interface. This local modification addresses the volume expansion problem at the electrode level while maintaining the overall energy storage capacity of the battery system.
3Ease of manufacture
If waste electrolyte solutions are discarded, then battery production waste is removed, but environmental pollution occurs and resources are wasted
Solution Approach 1:
The patent implements discarding and recovering by establishing a recycling system where used electrolyte solutions are collected, processed to recover valuable components (lithium salts, solvents), and reused in new batteries. This approach eliminates environmental pollution from disposal while recovering resources, transforming waste management from a harmful process to a beneficial resource circulation system.
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 enhances ion migration, reduces electrode active material dissolution, and alleviates the shuttle phenomenon, while enabling the recycling of lithium from waste batteries to produce a new electrolyte solution, thus improving battery performance and reducing environmental impact.
Implementation Method 1
Li6S2 is used as an additive, which produces a buffering effect to reduce dissolution of the positive electrode active material and alleviates the 'shuttle phenomenon'
Implementation Method 2
Adding a functional intermediate layer to the electrolyte solution of a lithium-sulfur battery is also an effective means to block or adsorb lithium polysulfide
Implementation Method 3
The solution enhances ion migration, reduces electrode active material dissolution, and alleviates the shuttle phenomenon
Implementation Method 4
The dissolution of lithium polysulfide, the discharge product of sulfur, in the electrolyte solution of the organic lithium-sulfur battery causes the 'shuttle phenomenon'
Data Source
AI summary
The invention belongs to the field of an electrolyte solution for a battery, and discloses a lithium-sulfur battery electrolyte and a preparation method and application thereof. The electrolyte solution comprises the following components: an organic solvent, an electrolyte and an additive; the organic solvent is 1,1,2, 2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether and 1,3-dioxolane; the electrolyte is bis(hexafluoroethane) sulfonamide lithium salt and LiCF3SO3; the additive is a lithium-sulfur compound, wherein the lithium-sulfur compound is Li6S2. The invention recovers an electrolyte solution from a lithium-sulfur battery, and then extracts the Li element in the electrolyte solution, which is recycled for preparation of a electrolyte solution of the lithium-sulfur battery; in addition, it can also enrich the organic components in the electrolyte solution of the waste lithium-sulfur battery, facilitating a centralized processing and reduction of leakage pollution.