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
CN108963149AInactive Publication Date: 2018-12-07QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
Publication Date
2018-12-07
Estimated Expiration
Not applicable · inactive patent

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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.
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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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