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

Novel electrolyte of secondary lithium-sulfur battery and battery

A lithium-sulfur battery and electrolyte technology, which is applied in the field of electrolyte, can solve the problems of poor cycle life and rate performance, and cannot meet commercialization, and achieve the effect of improving cycle life

Pending Publication Date: 2019-11-05
东莞市坤乾新能源科技有限公司
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current lithium-sulfur batteries have poor cycle life and rate performance and cannot meet the needs of commercialization. The main reason is the shuttle effect of lithium polysulfide in the positive electrode and the lithium dendrite side reaction in the negative electrode.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A lithium battery consists of a positive electrode, a negative electrode, a separator, an electrolyte, and an outer packaging. The outer packaging is aluminum-plastic film.

[0023] Wherein, the positive electrode is composed of sulfur powder, conductive agent and binder. The conductive agent is SUPER-P with a content of 3%, the adhesive is PVDF with a content of 3.5%, and the rest is sulfur powder.

[0024] The negative electrode is lithium metal, the diaphragm is PE, and the capacity is 350mAh. The electrolyte is composed of solvent, lithium salt and additives. The massfractions of solvent, additive and lithium salt are as follows:

[0025] Solvent: DME / DOL=40% / 40% (WT)

[0026] Additive: Acetonitrile 3%

[0027] Lithium salt: LiPF 6 13%, LiTFSi 1%, and LINO 3 3%

[0028] The obtained lithium-sulfur battery was cycled at 0.2C, charged and discharged 200 times, and the capacity remained 80%.

Embodiment 2

[0030] The difference from Example 1 is:

[0031] Solvent: DME / DOL=40% / 40% (WT)

[0032] Additive: Adiponitrile 3%

[0033] Lithium salt: LiPF 6 13%, LiTFSi 1%, and LINO 3 3%

[0034] The obtained lithium-sulfur battery was cycled at 0.3C, charged and discharged 250 times, and the capacity remained 80%.

Embodiment 3

[0036] The difference from Example 1 is:

[0037] Solvent: DME / DOL=40% / 40% (WT)

[0038] Additive: Acrylonitrile 3%

[0039] Lithium salt: LiPF 6 13%, LiTFSi 1%, and LINO 3 3%.

[0040] The obtained lithium battery was cycled at 0.5C, charged and discharged 300 times, and the capacity remained 80%.

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 novel electrolyte of a secondary lithium-sulfur battery. The novel electrolyte comprises a solvent, a lithium salt and an additive. The mass fraction of the additive in the electrolyte is 0.5-15%, and the additive comprises one or the combination of two of mononitriles, dinitriles, unsaturated nitriles and cyclic nitriles. The invention also discloses a battery using theelectrolyte. The additive in the electrolyte uses the nitrile substance, the nitrile substance contains a C[triple bond]N which can have complex reaction with the positive electrode active material toform a protective film to hinder dissolution and shuttle of the polysulfur compound so that the cycle life can be enhanced and the commercialized application can be obtained.

Description

technical field [0001] The invention relates to an electrolyte, in particular to a novel electrolyte for a secondary lithium-sulfur battery. The present invention uses the battery of the electrolytic solution. Background technique [0002] Among the known negative electrode materials for batteries, metal lithium has the most negative potential and the largest specific capacity. Among the known cathode materials, elemental sulfur has a moderate potential and a large specific capacity. When the unit mass of elemental sulfur is completely transformed into S 2- The theoretical specific capacity generated at this time is as high as 1675mAh / g. The lithium-sulfur battery is a battery composed of metal lithium and elemental sulfur, and its theoretical specific energy can reach 2600Wh / kg, which is 3-5 times the theoretical specific energy of the current commercial lithium-ion battery. After being made into cell products, the actual energy density of lithium-sulfur batteries can s...

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 Applications(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/052H01M10/42
CPCH01M10/052H01M10/0567H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 陈性保许杰
Owner 东莞市坤乾新能源科技有限公司