Membrane material for lithium sulfur battery positive electrode

A lithium-sulfur battery and membrane material technology, applied in the field of electrochemical batteries, can solve the problems of capacity loss, corrosion of metal lithium negative electrode, reduction of battery charging and discharging coulomb efficiency, etc., and achieve the effects of reducing corrosion effect, inhibiting dissolution and superior performance.

Active Publication Date: 2014-12-03
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of charge and discharge, elemental sulfur is easily dissolved to form soluble polysulfides. The dissolution of polysulfides in the electrolyte will reduce the coulombic efficiency of battery charge

Method used

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  • Membrane material for lithium sulfur battery positive electrode
  • Membrane material for lithium sulfur battery positive electrode
  • Membrane material for lithium sulfur battery positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0045] Example 1

[0046] The preparation method of the film material for the positive electrode of the lithium-sulfur battery in this embodiment includes the following steps:

[0047] (1) Pretreatment of membrane precursor material: The membrane precursor material cotton is placed in ethylene glycol solution and soaked for 9 hours, washed with distilled water 3 times, placed in a vacuum drying box, and vacuum dried at 70°C for 6 hours for use;

[0048] (2) Take the filler material acetylene black, stabilizer nano vanadium pentoxide and binder A polyvinylidene fluoride solution (PVDF, 15wt%, solvent is NMP), the mass ratio of filler material to binder A is 1: 2. The quality of the stabilizer is 10% of the mass of the filling material. After the slurry is adjusted, the slurry is uniformly scraped on the pretreated film precursor material in step (1). The thickness of the scraped slurry is 0.05mm, and it is placed in a vacuum In the drying box, vacuum drying at 50°C for 24 hours to ob...

Example Embodiment

[0054] Example 2

[0055] The preparation method of the film material for the positive electrode of the lithium-sulfur battery in this embodiment includes the following steps:

[0056] (1) Pretreatment of membrane precursor material: The conductive carbon fiber of membrane precursor material is placed in ethanol solution and soaked for 8 hours, washed with distilled water 3 times, placed in a vacuum drying oven, and vacuum dried at 100°C for 2 hours.

[0057] (2) Take filling material superconducting carbon black, stabilizer nano zinc oxide and binder A carboxymethyl cellulose solution (CMC, 10wt%, solvent is distilled water), the mass ratio of filling material to binder A is 1 :2. The quality of the stabilizer is 5% of the mass of the filling material. After the slurry is adjusted, the slurry is uniformly scraped on the pretreated film precursor material in step (1), and the thickness of the scraped slurry is 0.10mm. In the vacuum drying box, vacuum drying at 50°C for 24 hours to o...

Example Embodiment

[0063] Example 3

[0064] The preparation method of the film material for the positive electrode of the lithium-sulfur battery in this embodiment includes the following steps:

[0065] (1) Pretreatment of membrane precursor material: the membrane precursor material polyester is immersed in isopropanol solution for 10 hours, washed 3 times with distilled water, placed in a vacuum drying oven, and vacuum dried at 60°C for 8 hours for use;

[0066] (2) Take the filler superconducting graphite, stabilizer nano-titanium dioxide and binder A polytetrafluoroethylene emulsion (PTFE, 60wt%, purchased from Xinxiang Heluoda Power Material Co., Ltd.), filler and binder The mass ratio of A is 1:10, and the mass of stabilizer is 1% of the mass of the filler. After the slurry is adjusted, the slurry is evenly sprayed on the film precursor material pretreated in step (1), and the thickness of the spray slurry is 0.2 mm, placed in a vacuum drying oven and vacuum dried at 100°C for 5 hours to obtain ...

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Abstract

The invention discloses a membrane material for a lithium sulfur battery positive electrode, and belongs to the technical field of electrochemical batteries. The membrane material for making the lithium sulfur battery is designed against the disadvantages of poor conductivity, low active substance utilization rate and the like of traditional lithium sulfur batteries, and has the advantages of multilayer filter screen structure, prosperous gap, high conductivity, simple preparation technology and harmlessness to the environment. The membrane material for the positive electrode is placed between a positive plate and a diaphragm, so the dissolution of the polysulfide in the electrolyte in the charge and discharge process of the battery is effectively inhibited, and the corrosion of the polysulfide to a metallic lithium negative electrode is reduced. The lithium sulfur battery adopting the membrane material has a high active substance utilization rate and stable cycle performances, has an initial discharge specific capacity under a current density of 0.162mA/cm<2>, and still has a discharge specific capacity of above 702mAh/g after 50 times cycle; and compared with traditional lithium sulfur batteries, the lithium sulfur battery adopting the membrane material has the advantages of excellent performances and low cost, and lays a good foundation for the marketization of the lithium sulfur battery.

Description

technical field [0001] The invention specifically relates to a membrane material for the cathode of a lithium-sulfur battery, which belongs to the technical field of electrochemical batteries. Background technique [0002] As technology enters a new era of green energy, indicators such as production cost, cycle life, safety performance, and use efficiency have become important criteria for us to examine energy storage systems. Traditional secondary batteries have disadvantages such as low specific energy, high price, and inability to meet the needs of power vehicles. Therefore, it is particularly important to develop new green secondary batteries with high specific energy, low price and long cycle life. Lithium-sulfur battery is one of the most promising energy storage systems and has become the focus of extensive research in recent years because of its cheap and easy-to-obtain raw materials, environmental friendliness, and high specific energy of the system. [0003] Lith...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/62H01M10/052
CPCH01M4/13H01M4/139H01M4/628H01M10/052Y02E60/10
Inventor 曹朝霞马超尹艳红杨书廷岳红云李向南
Owner HENAN NORMAL UNIV
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