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Preparation and application of graphdiyne material modified diaphragm

A technology of graphyne and diaphragm, which is applied in the field of preparation of lithium-sulfur battery diaphragm, can solve problems such as uneven diaphragm coating, increased diaphragm thickness, and reduced cycle stability, so as to achieve maximum play space and control possibility, energy density and Improved cycle performance and improvement of insulation defects

Inactive Publication Date: 2018-12-07
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The protective material used in the above patents is directly coated or deposited on the surface of the diaphragm. Although it can physically hinder the shuttle effect of polysulfides, it will also cause the coating to increase the thickness of the diaphragm and partially block the pores, which will affect the migration of lithium ions; At the same time, the direct coating method often has uneven coating of the separator, which will further lead to uneven distribution of lithium ions, aggravate lithium dendrite growth, reduce cycle stability, and affect battery performance (a high-performance composite separator for lithium-sulfur batteries and Its preparation method, Chinese patent: CN 107895767 A)

Method used

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  • Preparation and application of graphdiyne material modified diaphragm
  • Preparation and application of graphdiyne material modified diaphragm

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Embodiment 1

[0024] Ultrasonic wash the copper foil-wrapped diaphragm (copper foil 4×12 cm, 10 pieces of diaphragm 3×10 cm) with hydrochloric acid with a concentration of 1 mol / L for 10 minutes, and then ultrasonically wash with water, ethanol and acetone for 10 minutes before using Blow dry with argon. The dried copper foil-wrapped septum was placed in a 100 mL three-neck flask loaded with 80 mL of anhydrous pyridine solvent, and the gas in the bottle was replaced with an argon atmosphere. Dissolve 36mg of hexaynylbenzene monomer with 20mL of pyridine and inject it into the argon-protected constant pressure funnel through a syringe, drop into the septum filled with solvent and copper foil that has been kept at 50°C (preferably 50°C). In the three-necked flask, the drop was completed within 2 hours; the system was kept at 50°C for 12 hours. After the reaction, take out the aluminum sheet, wash the copper sheet several times with ethanol and acetone in turn, and finally dry it under vacuum...

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Abstract

Belonging to the technical field of energy materials, the invention in particular relates to preparation and application of a graphdiyne material modified diaphragm. Directed at the problems of low electron conductivity, poor cyclic stability, the shuttle effect of lithium polysulfide and the like in existing lithium-sulfur battery diaphragms, solution in-situ polymerization is applied for deposition of a graphdiyne carbon nanomaterial on a commercial diaphragm. Preparation of the diaphragm mainly includes the steps of: preparation of a graphdiyne monomer serving as a carbon protective layer and deposition of a graphdiyne material in a solution on the surface of a commercial diaphragm. The graphdiyne material modified diaphragm prepared by the method has the characteristics of simple and controllable preparation process, easy large-scale preparation, stable material structure, etc. The prepared diaphragm can reduce the shuttle effect of polysulfides in the electrochemical reaction process, and improves the capacity and cycle performance of energy storage devices.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to the preparation and application of a lithium-sulfur battery diaphragm modified by chemical in-situ synthesis of graphyne-like carbon nanomaterials. Background technique [0002] Sulfur is abundant on the earth, cheap, and has a high theoretical specific capacity (1672 mAh / g). Lithium-sulfur batteries using sulfur as the cathode material are very conducive to the preparation of low-cost, high-performance batteries and other energy devices. Become one of the effective substitutes for next-generation high-energy storage devices. However, the practical application of lithium-sulfur batteries still faces many major difficulties and challenges, such as short service life, poor rate performance, and low Coulombic efficiency. This is mainly because the polysulfide compound (Sn2-) intermediate formed during the reaction has good solubility, and after passing through ...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 黄长水王坤王宁
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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