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A kind of high-performance composite diaphragm for lithium-sulfur battery and preparation method thereof

A composite diaphragm, lithium-sulfur battery technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as hindering the diffusion of polysulfide ions, and achieve the effect of small impact on characteristics and convenient operation

Active Publication Date: 2020-08-04
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to propose a high-performance composite diaphragm for lithium-sulfur batteries and a preparation method thereof, so as to solve the above-mentioned problems existing in existing lithium-sulfur batteries. While hindering the diffusion of polysulfide ions, it allows lithium ions to pass through quickly, and at the same time improves the insulation defects of the sulfur cathode, thereby effectively improving the cycle performance and rate performance of lithium-sulfur batteries.

Method used

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  • A kind of high-performance composite diaphragm for lithium-sulfur battery and preparation method thereof
  • A kind of high-performance composite diaphragm for lithium-sulfur battery and preparation method thereof
  • A kind of high-performance composite diaphragm for lithium-sulfur battery and preparation method thereof

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Embodiment 1

[0034] A high-performance composite separator for lithium-sulfur batteries, including a polypropylene commercial separator and C and LLZO nanoparticles sputtered on the surface of the base film. Install the carbon target corresponding to the DC source and the lanthanum lithium zirconate target corresponding to the radio frequency source, use polypropylene commercial diaphragm as the base material, and the vacuum chamber atmosphere during the sample preparation process is high-purity argon, and the background vacuum degree is 6.6× 10 -4 Pa, the sputtering pressure was controlled at 0.9 Pa, the substrate temperature was controlled at room temperature, the DC sputtering power was 80 W, the RF sputtering power was 30 W, and the sample deposition time was 40 min.

Embodiment 2

[0036] A high-performance composite separator for lithium-sulfur batteries, including a polypropylene commercial separator and C and LLZO nanoparticles sputtered on the surface of the base film. Install the carbon target corresponding to the DC source and the lanthanum lithium zirconate target corresponding to the radio frequency source, use polypropylene commercial diaphragm as the base material, and the vacuum chamber atmosphere during the sample preparation process is high-purity argon, and the background vacuum degree is 6.6× 10 -4 Pa, the sputtering pressure was controlled at 0.9 Pa, the substrate temperature was controlled at room temperature, the DC sputtering power was 80 W, the RF sputtering power was 30 W, and the sample deposition time was 30 min.

Embodiment 3

[0038] A high-performance composite separator for lithium-sulfur batteries, including polypropylene commercial separator and C and LLZO nanoparticles sputtered on the surface of the base film. Install the carbon target corresponding to the DC source and the lanthanum lithium zirconate target corresponding to the radio frequency source, use polypropylene commercial diaphragm as the base material, and the vacuum chamber atmosphere during the sample preparation process is high-purity argon, and the background vacuum degree is 6.6× 10 -4 Pa, the sputtering pressure was controlled at 0.9 Pa, the substrate temperature was controlled at room temperature, the DC sputtering power was 80 W, the RF sputtering power was 30 W, and the sample deposition time was 20 min.

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Abstract

The invention discloses a high-performance composite diaphragm for lithium-sulfur batteries and a preparation method thereof. The high-performance diaphragm is aimed at the problems of electronic conductivity, ion conductivity, cycle stability, etc., using magnetron sputtering double-target co-sputtering technology in the Carbon materials and lithium lanthanum zirconate are deposited on the commercial separator. This method effectively avoids the problems of blocking the pores of the separator caused by the direct coating method, thereby improving the lithium ion conductivity. Among them, the introduction of conductive carbon improves the insulation defect of the sulfur cathode and provides the possibility for physical adsorption of polysulfides; the unique structure of LLZO also improves the lithium ion conductivity and provides more reliable chemical adsorption for polysulfides. A cycle-stable high-capacity battery design is achieved through the synergistic effect of van der Waals forces and chemical bonds. To a certain extent, the invention solves the problem that the polysulfide hindrance rate and the lithium ion diffusivity are difficult to balance in the modification of the lithium-sulfur battery diaphragm.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a high-performance lithium-sulfur battery composite diaphragm and a preparation method thereof. Background technique [0002] As a positive electrode material, sulfur alone has the highest theoretical specific capacity (1675 mAh / g) and theoretical specific energy (2600 Wh / kg), and is the LiCoO in traditional lithium-ion batteries. 2 (274mAh / g) and other positive electrode materials 6 times. In addition, sulfur has huge reserves in nature, and has low toxicity and little environmental pollution. Therefore, lithium-sulfur batteries have become a hot spot in current international research and are an ideal choice for future new energy power batteries. [0003] However, the real commercialization of lithium-sulfur secondary batteries still faces many challenges. The diffusion of polysulfides and the insulating nature of sulfur are the key factors that li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16B82Y30/00H01M50/403H01M50/451H01M50/489
CPCB82Y30/00H01M50/403H01M50/431H01M50/411H01M50/449Y02E60/10
Inventor 黄锋林李柯周宁许星海魏取福
Owner JIANGNAN UNIV
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