Unlock instant, AI-driven research and patent intelligence for your innovation.

A lithium-sulfur battery electrolyte and a lithium-sulfur battery using the electrolyte

A lithium-sulfur battery and electrolyte technology, applied in the field of lithium-sulfur battery electrolyte and lithium-sulfur battery, can solve the problems of inability to use lithium-ion battery electrolyte, narrow potential window, low conductivity, etc., and achieve good electrochemical performance, The effect of improved safety performance and low viscosity

Active Publication Date: 2019-12-06
SHANDONG UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since lithium polysulfide, the intermediate product of lithium-sulfur battery using sulfur element, is easy to react with common commercial ordinary carbonates, the usual lithium-sulfur batteries cannot use commercial lithium-ion battery electrolytes, such as figure 1 and 2 shown
At present, most lithium-sulfur batteries use ether organic solvents as carriers, such as ethylene glycol dimethyl ether, dioxane, etc. However, ether organic solvents have low polarity, low boiling point, easy volatility, low conductivity, and narrow potential window. , high price, flammable and other disadvantages

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A lithium-sulfur battery electrolyte and a lithium-sulfur battery using the electrolyte
  • A lithium-sulfur battery electrolyte and a lithium-sulfur battery using the electrolyte
  • A lithium-sulfur battery electrolyte and a lithium-sulfur battery using the electrolyte

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] Secondly, the present invention also provides a preparation method for the above lithium-sulfur battery electrolyte, comprising the following steps:

[0039] First, remove water from the fluorocarbonate organic solvent, and then add lithium salt to the solvent containing the fluorocarbonate organic solvent and / or other functional additives in an anhydrous and oxygen-free environment to form electrolytes with different concentrations.

[0040] Preferably, the lithium salt should be slowly added to the solvent of the organic solvent and / or other functional additives to prevent the solvent from boiling due to overheating.

[0041] Preferably, the water removal is completed by using 4A potassium molecular sieve for 40-55 hours.

[0042] The present invention also protects the application of the above-mentioned electrolyte in lithium-sulfur batteries.

[0043] In addition, the present invention also provides a lithium-sulfur battery, which is characterized in that it contai...

Embodiment

[0046] Mix 10 ml of trifluoromethylpropylene carbonate (TFPC) with 10 ml of bis(trifluoroethyl)carbonate (DTFDEC), slowly add 5.74 g of LITFSI to the above mixed solvent to form a 1M solution, and ignite Experiments have shown that the electrolyte cannot be ignited. Prepare a slurry of sublimated sulfur, conductive agent Ketjen black, and binder PVDF at a ratio of 8:1:1, coat it on an aluminum foil current collector, and dry it in vacuum at 50°C for 24 hours. Use the prepared electrolyte in a glove box, lithium The sheet is the negative electrode to assemble the battery, charge and discharge between 1-3V.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a lithium-sulfur battery electrolyte with high safety and high performance. The electrolyte is prepared from three components as follows: 0.1-10 mol / L of lithium salt, a fluoro cyclic and / or chain-like carbonate ester compound organic solvent and other functional additives. The electrolyte is quite stable for lithium polysulfide, and the problem about reaction of common carbonate ester solvents and lithium polysulfide is solved; meanwhile, the fluorine element has a good flame retardant property and the safety performance of the lithium-sulfur battery adopting the electrolyte can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a lithium-sulfur battery electrolyte and a lithium-sulfur battery using the electrolyte. Background technique [0002] The development of a high-energy battery system is the key to improving the battery life of electric vehicles. Lithium-sulfur batteries are a type of lithium batteries. As of 2013, they are still in the research stage. Lithium-sulfur batteries use sulfur as the positive electrode of the battery and metallic lithium as the negative electrode. Elemental sulfur is abundant in the earth and has the characteristics of low price and environmental friendliness. The lithium-sulfur battery using sulfur as the positive electrode material has a high material theoretical specific capacity and battery theoretical specific energy, reaching 1672mAh / g and 2600Wh / Lig, respectively, which is much higher than the capacity of the widely used lithium cobalt oxide battery (...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0569H01M10/0567H01M10/0568H01M10/052
CPCH01M10/052H01M10/0567H01M10/0568H01M10/0569Y02E60/10
Inventor 冯金奎
Owner SHANDONG UNIV