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A lithium sulfide battery functional separator coating material and a preparation method thereof

A coating material, a technology for lithium-sulfur batteries, applied in the field of material chemistry, can solve problems such as the inability to suppress the shuttle effect of polysulfides, and achieve the effects of improving capacity retention, improving surface adsorption, and reducing solubility

Active Publication Date: 2019-01-18
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the defect that the current lithium-sulfur battery diaphragm cannot suppress the polysulfide shuttle effect, the purpose of the present invention is to provide a lithium-sulfur battery functional diaphragm coating material and a preparation method thereof. The battery diaphragm coating material prepared by this method has lithium Ion selective permeability function can effectively improve the cycle performance and coulombic efficiency of lithium-sulfur batteries

Method used

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  • A lithium sulfide battery functional separator coating material and a preparation method thereof
  • A lithium sulfide battery functional separator coating material and a preparation method thereof
  • A lithium sulfide battery functional separator coating material and a preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] Step (1): Sonicate industrially produced 2 mg / ml graphene oxide (GO) in a cell pulverizer for 1 hour, then centrifuge at 6000 r / min for 0.5 hour, and take the upper graphene oxide dispersion.

[0024] Step (2): Cut the nickel foam into small pieces with a section 888 of 2*2cm, immerse in the graphene oxide obtained in step (1), and ultrasonicate for 30 minutes.

[0025] Step (3): Take the massive product 1 obtained in step (2) and transfer it to a 10mg / ml sodium ascorbate solution, let it stand for 12 hours, then keep it in a constant temperature oven at 60°C for 2 hours, and after cooling to room temperature, Rinse with deionized water.

[0026] Step (4): Immerse the bulk product 2 obtained in step (3) in PDMS for 15 minutes, take it out and vacuum it for 2 hours, then use paper to absorb excess PDMS on the surface and place it on a dust-free paper. Flip every 30 minutes.

[0027] Step (5): Dry the massive product 3 obtained in step (4) in a constant temperature dryi...

Embodiment 2

[0032] Step (1): Sonicate industrially produced 2 mg / ml graphene oxide (GO) in a cell pulverizer for 1 hour, then centrifuge at 6000 r / min for 0.5 hour, and take the upper graphene oxide dispersion.

[0033] Step (2): Cut the nickel foam into small pieces with a cross-section of 2*2cm, immerse in the graphene oxide obtained in step (1), and ultrasonicate for 30 minutes.

[0034] Step (3): Take the massive product 1 obtained in step (2) and transfer it to 8mg / ml sodium ascorbate solution, let it stand for 12 hours, then keep it in a constant temperature oven at 60°C for 2 hours, and after cooling to room temperature, Rinse with deionized water.

[0035] Step (4): Immerse the bulk product 2 obtained in step (3) in PDMS for 10 minutes, take it out and vacuum it for 2 hours, then use paper to absorb excess PDMS on the surface and place it on a dust-free paper. Flip every 30 minutes.

[0036]Step (5): Dry the massive product 3 obtained in step (4) in a constant temperature drying...

Embodiment 3

[0039] Step (1): Industrially produced 2 mg / ml graphene oxide (GO) was sonicated in a cell pulverizer for 1 hour, and then centrifuged at 6000r / min for 0.5 hour to obtain the upper graphene oxide dispersion.

[0040] Step (2): Cut the nickel foam into small pieces with a cross section of 2*2cm, immerse in the graphene oxide obtained in step (1), and ultrasonicate for 30 minutes.

[0041] Step (3): Take the massive product 1 obtained in step (2) and transfer it to a 6mg / ml sodium ascorbate solution, let it stand for 12 hours, then keep it in a constant temperature oven at 60°C for 2 hours, and after cooling to room temperature, Rinse with deionized water.

[0042] Step (4): Immerse the bulk product 2 obtained in step (3) in PDMS for 20 minutes, take it out and vacuum it for 2 hours, then use paper to absorb excess PDMS on the surface and put it on a dust-free paper. Flip every 30 minutes.

[0043] Step (5): Dry the massive product 3 obtained in step (4) in a constant temperat...

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Abstract

The invention belongs to the field of material chemistry and relates to a lithium sulfur battery functional separator and a preparation method thereof. The functional diaphragm coating material provided by the invention comprises anatase TiO2 and reduced graphene oxide, wherein the reduced graphene oxide is porous, Anatase TiO2 is uniformly distributed on the porous reduced graphene oxide framework, the coating material enables the diaphragm to have the function of lithium ion selective permeability, the anatase TiO2 uniformly distributed on the framework of reduced graphene oxide can promotethe interaction between TiO2 and S, which improves the adsorption of polysulfide on TiO2 surface, and ultimately reduces the solubility of polysulfide, and porous reduced graphene oxide provides migration channels for lithium ions.

Description

technical field [0001] The technical solution of the invention relates to a preparation method of a lithium-sulfur battery functional diaphragm, which belongs to the field of material chemistry. Background technique [0002] Energy is an important pillar supporting the development of modern society, and an efficient energy storage system will bring huge changes to society. Batteries are one of the main ways to store energy, and the replacement of batteries has brought tremendous changes to the renewable energy industry, electronics industry and electric vehicle industry. As a commonly used energy storage device at present, lithium-ion batteries are still difficult to meet the requirements of high specific capacity and high energy density for future power batteries due to the limitation of their own storage capacity. Therefore, it is particularly important to research and develop high-performance lithium-ion batteries. [0003] Lithium-sulfur batteries have a high theoretic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/052C09D1/00H01M50/431H01M50/449
CPCH01M10/052C09D1/00H01M50/431H01M50/449Y02E60/10
Inventor 钊妍李俊华
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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