Lithium-sulfur battery electrolyte, application thereof and lithium-sulfur battery

A lithium-sulfur battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as unsatisfactory effects, achieve good synergistic effects, improve conversion efficiency, and reduce deposition effects

Pending Publication Date: 2020-06-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above reported additives are still unsatisfactory in improving the performance of lithium-sulfur batteries.

Method used

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  • Lithium-sulfur battery electrolyte, application thereof and lithium-sulfur battery
  • Lithium-sulfur battery electrolyte, application thereof and lithium-sulfur battery
  • Lithium-sulfur battery electrolyte, application thereof and lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Lithium-sulfur batteries were prepared as follows:

[0044] ①Electrolyte configuration: in a glove box with argon atmosphere (H 2 O3 ~R 4 is methyl), fully stirred evenly, promptly obtains the lithium-sulfur battery electrolyte of the present invention.

[0045] ②Preparation of sulfur positive electrode: mix sulfur / carbon composite material (70% sulfur load), acetylene black, and PVDF at a ratio of 90:3:7, and then add an appropriate volume of N-methylpyrrolidone (NMP) Stir in a slurry machine for 15 minutes at a speed of 15 kr / min to form a stable and uniform positive electrode slurry. The slurry was coated on a carbon-coated aluminum foil with a doctor blade, and dried in an oven at 80°C for 8 hours until the NMP was completely volatilized.

[0046] ③Lithium-sulfur button battery assembly test: The prepared sulfur pole piece was punched into a Φ13mm circular pole piece, and baked in an oven at 55°C for 1h. In an argon atmosphere, a lithium metal sheet was used as ...

Embodiment 2-15 and comparative example 1

[0048] Compared with Example 1, the only difference lies in the added components of the electrolyte (the types and contents of auxiliary additives and additives are different, see Table 1 for details), and other parameters and preparation methods are the same as in Example 1.

[0049] Part of the experimental conditions of table 1 embodiment 2-15 and comparative example 1

[0050]

[0051]

[0052] The test results of each embodiment of table 2 and comparative example 1

[0053]

[0054] Compared with Comparative Example 1 in Examples 1 to 6, the specific discharge capacity of the first cycle in Comparative Example 1 is 886mAh / g at a discharge rate of 0.5C, and the specific discharge capacity of the first cycle in Examples 1 to 6 increases compared with it 138-328mAh / g, the 100-cycle cycle performance also increased from 47.74% to 69.58-74.95%, and the Coulombic efficiency increased from 98.1% to the best 99%. It can be seen that adding the additive of the present in...

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Abstract

The invention provides a lithium-sulfur battery electrolyte, application thereof and a lithium-sulfur battery, and belongs to the technical field of lithium-sulfur batteries. Specifically, the lithium-sulfur battery electrolyte comprises an additive with an imidazolinone ring structure. By adding the additive with the structure into the electrolyte, the polarization effect in the charging and discharging process of the lithium-sulfur battery is reduced, the conversion efficiency of polysulfide is improved, the dissolution of short-chain polysulfide is promoted, and finally, the capacity and the cycling stability of the lithium-sulfur battery are obviously improved.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a lithium-sulfur battery electrolyte and its application, and a lithium-sulfur battery containing the electrolyte. Background technique [0002] 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. Lithium-sulfur batteries using sulfur as the cathode material have high material theoretical specific capacity and battery theoretical specific energy, reaching 1675mAh / g and 2600Wh / kg, respectively, which are much higher than the capacity of lithium cobalt oxide batteries widely used in commerce (< 150mAh / g). In addition, sulfur is an environmentally friendly element that basically has no pollution to the environment, and is a very promising lithium battery material. However, du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235Y02E60/10
Inventor 赖延清洪波史晨阳王麒羽张雪亚张治安张凯
Owner CENT SOUTH UNIV
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