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Composite separator, process for preparing the same, and lithium-sulfur battery comprising the same

A composite diaphragm and diaphragm technology, applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve problems such as weak physical force, damage to battery performance, and reduced conductivity of the modified layer

Inactive Publication Date: 2018-12-18
NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the current commonly used physical method to coat the separator with functional coating, the physical force between the base film and the coating is weak, and the coating is easy to fall off
In addition, the non-conductive binder used in the production process will reduce the conductivity of the modified layer and hinder the diffusion of lithium ions, which will seriously damage the performance of the battery in all aspects.

Method used

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  • Composite separator, process for preparing the same, and lithium-sulfur battery comprising the same
  • Composite separator, process for preparing the same, and lithium-sulfur battery comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] At room temperature, 7.9g KMnO 4 Add the powder into 100g of water and configure 0.5mol / L of KMnO 4 solution. Using a polyethylene diaphragm as the base film, a 10×10 cm base film sample was soaked in the KMnO 4 solution, and placed in a blast drying oven at a temperature of 40°C, soaking for 1 day. After the completion, the separator was repeatedly rinsed with deionized water, and dried in a blast drying oven at 50°C for 10 hours to obtain the composite MnO for lithium-sulfur batteries. 2 @PE diaphragm (C1).

Embodiment 2

[0058] At room temperature, 7.9g KMnO 4 Add the powder into 100g of water and configure 0.5mol / L of KMnO 4 solution. Using a polyethylene diaphragm as the base film, a 10×10 cm base film sample was soaked in the KMnO 4 solution, and placed in a blast drying oven at a temperature of 50°C, soaking for 1 day. After the completion, the separator was repeatedly rinsed with deionized water, and dried in a blast drying oven at 50°C for 10 hours to obtain the composite MnO for lithium-sulfur batteries. 2 @PE diaphragm (C2).

Embodiment 3

[0060]At room temperature, 7.9g KMnO 4 Add the powder into 100g of water and configure 0.5mol / L of KMnO 4 solution. Using a polyethylene diaphragm as the base film, a 10×10 cm base film sample was soaked in the KMnO 4 solution, and placed in a blast drying oven at a temperature of 60°C, soaking for 1 day. After the completion, the separator was repeatedly rinsed with deionized water, and dried in a blast drying oven at 50°C for 10 hours to obtain the composite MnO for lithium-sulfur batteries. 2 @PE diaphragm (C3).

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Abstract

The invention relates to a composite separator, a preparation method thereof and a lithium sulfur battery comprising the same. The composite diaphragm comprises a polyolefin-based membrane whose surface is oxidized; And a MnO2 nanoparticle layer disposed on the surface of the polyolefin-based film. When the composite membrane is used for preparing a lithium sulfide battery, the chemical interaction formed by the metal oxygen bond in the MnO2 and the lithium polysulfide can effectively inhibit the diffusion of the lithium polysulfide to the negative electrode, and the cycle life of the lithiumsulfide battery is greatly improved; On the other hand, the mechanical properties of the composite diaphragm have been further improved, especially the thermal shrinkage of the diaphragm is improved obviously, which is helpful to improve the safety of lithium sulfide batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery separators, and in particular relates to a composite separator, a preparation method thereof and a lithium-sulfur battery containing the same. Background technique [0002] Lithium-sulfur battery is a kind of battery energy storage system with great application and development prospects. Its theoretical specific energy is as high as 2500Wh / kg, and it has the advantages of low raw material cost and environmental friendliness. However, the current practical application is limited by many factors. , such as the electronic ion insulation of elemental sulfur and its discharge product (lithium polysulfide), the volume expansion phenomenon during the intercalation / delithiation process, and the "shuttle effect" caused by the dissolution and migration of lithium polysulfide. Among these shortcomings, the "shuttle effect" of lithium polysulfides causes low charge-discharge efficiency, poor cy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/052H01M50/403H01M50/451H01M50/491
CPCH01M10/052H01M50/403H01M50/431H01M50/411H01M50/449Y02E60/10
Inventor 王欢王晓明杨浩田黄云
Owner NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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