Lithium-sulphur battery electrolyte and chargeable lithium-sulphur battery thereof

An electrolyte, sulfur battery technology, applied in the field of electrochemical and chemical power products, can solve the problems of low utilization rate of active materials, poor battery cycle performance, reduced battery capacity, etc., to achieve excellent safety performance, long cycle life, specific capacity big effect

Inactive Publication Date: 2006-09-27
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are two main reasons restricting the development of lithium-sulfur batteries: first, S, Li 2 S is not conductive, and a large amount of conductive materials need to be added to the battery to reduce the battery capacity; second, the electrode reaction of S is a multi-step reaction, and the intermediate product (Li 2 S n , n=2-8) can be dissolved in traditional liquid electrolytes, resulting in the loss of active materials, so the utilization

Method used

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  • Lithium-sulphur battery electrolyte and chargeable lithium-sulphur battery thereof
  • Lithium-sulphur battery electrolyte and chargeable lithium-sulphur battery thereof
  • Lithium-sulphur battery electrolyte and chargeable lithium-sulphur battery thereof

Examples

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Effect test

Embodiment 1

[0047] With (EMIM)BF 4 (EMIM represents N-ethyl-N' methylimidazolium ion) as an example: the first step is quaternization, using methylimidazole (MIM) to prepare halogen-containing imidazolium salts, the reaction is as follows: . Specific operation: 35.0ml (0.63mol) of N-methylimidazole was vacuum distilled through KOH into a 250ml round bottom flask, and 90ml (0.69mol) of bromoethane was vacuum distilled through P 2 o 5 was added, the reaction mixture was refluxed for 2h under a nitrogen atmosphere, and cooled overnight to obtain a white solid dissolved in 50ml

[0048] In hot acetonitrile, filter under a nitrogen atmosphere, add 100ml of ethyl acetate to the filtrate, cool to -13°C, filter to obtain a precipitate, crystallize in 20ml of acetonitrile, filter, and dry in vacuum for 36h to obtain [EMIM]Br69.3g (yield 57.6%).

[0049] The second step is ion exchange, in which the halogen ions are exchanged for the required negative ions to obtain the ionic liquid. The ...

Embodiment 2

[0053] Take (EMIM)TFSI (where EMIM represents N-ethyl-N'methylimidazolium ion, TFSI represents N(CF 3 SO 2 ) 2 - ) is an example: the first step is quaternization, and the imidazolium salt containing halogen is obtained with methylimidazole, and the reaction is as follows:

[0054] Specific operation: 35.0ml (0.63mol) of N-methylimidazole vacuum distillation through KOH into a 250ML round bottom flask, 90ml (0.69mol) of bromoethane vacuum distillation through P 2 o 5 After adding, the reaction mixture was refluxed for 2 hours under a nitrogen atmosphere, and cooled overnight to obtain a white solid dissolved in 50ml of hot acetonitrile, filtered under a nitrogen atmosphere, 100ml of ethyl acetate was added to the filtrate, cooled to -13°C, and a precipitate was obtained by filtration. Crystallize in acetonitrile, filter, and dry in vacuum for 36 h to obtain [EMIM]Br69.3g (57.6% yield).

[0055] The second step is ion exchange, in which the halogen ions are exchanged...

Embodiment 3

[0059] Use (PP13)TFSI(PP13 to represent N-methyl-N-propylpiperidinium ion, TFSI to represent N(CF 3 SO 2 ) 2 - ) as an example the first step is quaternization, and the piperidine salt containing halogen is obtained with N-methylpiperidine, and the reaction is as follows:

[0060] Specific operation: 19.8g (0.2mol) N-methylpiperidine was dissolved in 30ml of acetonitrile, the solution was poured into a 250ml three-necked flask, stirred at 40°C under an Ar gas atmosphere, and then slowly dripped into bromopropane 24.6g ( 0.2mol), after reacting for 6 hours, the reaction solution was added to a beaker filled with 150ml ethyl acetate, a large amount of white precipitates were separated out, filtered to obtain precipitates, recrystallized in 20ml of acetonitrile, filtered, and dried in vacuum for 36h to obtain [PP13 ] Br 18g (yield 81%).

[0061] The second step is ion exchange, in which the halogen ions are exchanged for the required negative ions to obtain the ionic li...

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Abstract

This invention relates to a lithium-sulfur buttery electrolyte and chargeable lithium-sulfur buttery, wherein the electrolyte uses one or more than one quaternary amine salt ion liquid as solvent to inhibit the soluble capability of the middle product polysulfide from electrode reaction in electrolyte, which improves the capacity and circle life of Li-S battery. Li-S battery used this electrolyte has many advantages, such as the reversible capacity is large, the circle capability is well, and it has nice safety capability and a bright application future.

Description

technical field [0001] The invention relates to a lithium-sulfur battery using an ionic liquid electrolyte. Specifically, it relates to a lithium-sulfur battery electrolyte using one or more than one ionic liquid as a solvent and a lithium-sulfur battery containing the electrolyte, belonging to the technical field of electrochemical and chemical power supply products. Background technique [0002] With the rapid development of mobile electronic devices, the demand for secondary batteries has increased. In recent years, in order to comply with the development trend of dense, thin, small, and light-weight mobile electronic devices and electric vehicles, the demand for secondary batteries with high energy density and high safety performance has increased. [0003] Among the batteries meeting the above requirements, lithium-sulfur batteries are the most favorable in terms of energy density, and sulfur (S 8 ) energy density is 1680mAh / g, much higher than the current LiCoO 2 an...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M4/02H01M4/36
CPCY02E60/122H01M10/0569H01M10/052Y02E60/10
Inventor 袁利霞艾新平杨汉西曹余良
Owner WUHAN UNIV
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