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Lithium-sulfur battery, electrolyte and application thereof

A lithium-sulfur battery and electrolyte technology, which is applied in the field of electrolyte for lithium-sulfur batteries, can solve problems such as the impact of large-scale industrial production of lithium-sulfur batteries, and achieve good synergistic effects, improve performance, and improve conversion efficiency.

Active Publication Date: 2019-08-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the amount of electrolyte used in lithium-sulfur batteries far exceeds the demand for industrialization, which has a relatively large impact on the large-scale industrial production of lithium-sulfur batteries.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Lithium-sulfur batteries were prepared as follows:

[0048] ①Electrolyte configuration: in a glove box with argon atmosphere (H 2 O7 is H), fully stirred evenly, promptly obtains the lithium-sulfur battery electrolyte of the present invention.

[0049] 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.

[0050] 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 metal lithium sheet was used as the negativ...

Embodiment 2-15

[0051] Embodiment 2-15 and comparative example

[0052] 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.

[0053] Table 1

[0054]

[0055]

[0056] Table 2 each embodiment and the test result of comparative example

[0057]

[0058] Compared with Comparative Example 1 in Examples 1 to 5, Comparative Example 1 has a first-cycle discharge specific capacity of 886mAh / g at a discharge rate of 0.5C, and the first-cycle discharge specific capacity in Examples 1 to 5 is increased 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 invention can significantly improve the discharge s...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries, and particularly discloses a lithium-sulfur battery electrolyte. The electrolyte contains an additive with a double-= NOR cyclic conjugate structure. By adding the additive of 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 deposition of insoluble sulfide is reduced, and finally, the capacity and the cycle stability of the lithium-sulfur battery are obviously improved.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to an electrolyte for lithium-sulfur batteries and a lithium-sulfur battery using 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). And sulfur is an element that is friendly to the environment and basically has no pollution to the environment. It is a very promising lithium battery. However, due to its complex electrochemical reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052
CPCH01M10/0567H01M10/052Y02E60/10
Inventor 赖延清洪波史晨阳向前张雪亚张治安张凯
Owner CENT SOUTH UNIV