Preparation method of lithium-sulfur battery composite separator

A composite diaphragm and lithium-sulfur battery technology, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of reducing the utilization rate of sulfur active materials, slow migration speed, and deteriorating the performance of lithium-sulfur batteries, so as to reduce the shuttle effect, life-enhancing effect

Inactive Publication Date: 2017-08-18
SHENZHEN PEICHENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This phenomenon, known as the shuttle effect, reduces the availability of sulfur active species
At the same time insoluble Li 2 S and Li 2 S 2 Deposited on the surface of the lithium negative electrode, which further deteriorates the performance of the lithium-sulfur battery; (3) the final product of the reaction, Li 2 S is also an electronic insulator and will be deposited on the sulfur electrode, while lithium ions migrate slowly in solid lithium sulfide, slowing down the electrochemical reaction kinetics; (4) sulfur and the final product Li 2 The density of S is different. When sulfur is lithiated, the volume expands by about 79%, which easily leads to Li 2 Pulverization of S, causing safety problems in lithium-sulfur batteries
The above deficiencies restrict the development of lithium-sulfur batteries, which is also a key issue that needs to be solved in current research on lithium-sulfur batteries.

Method used

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  • Preparation method of lithium-sulfur battery composite separator
  • Preparation method of lithium-sulfur battery composite separator
  • Preparation method of lithium-sulfur battery composite separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Add 10g of graphite oxide to 10g of N-methylpyrrolidone and disperse by ultrasonic for 5 hours to form a suspension;

[0017] (2) Add 1g of polyacrylonitrile monomer to the above suspension, stir for 1 hour to disperse evenly, then add 0.01g of initiator azobisisobutyronitrile to the suspension, stir and react for 1 hour, after the reaction is complete, The suspension was poured into a suction filter bottle lined with a Celgard diaphragm and filter paper for suction filtration, and the filter paper was torn off after drying to obtain a lithium-sulfur battery composite diaphragm.

Embodiment 2

[0019] (1) Add 10g of graphite oxide into 100g of dimethyl sulfoxide and disperse by ultrasonication for 0.5 hours to form a suspension;

[0020] (2) Add 5g of polyacrylonitrile monomer to the above suspension, stir for 5 hours to disperse evenly, then add 0.15g of initiator dibenzoyl peroxide to the suspension, stir and react for 5 hours, after the reaction is complete, The suspension was poured into a suction filter bottle lined with a Celgard diaphragm and filter paper for suction filtration, and the filter paper was torn off after drying to obtain a lithium-sulfur battery composite diaphragm.

Embodiment 3

[0022] (1) Add 10g of graphite oxide into 50g of N,N-dimethylformamide, disperse by ultrasonic for 3 hours to form a suspension;

[0023] (2) Add 3g of polyacrylonitrile monomer to the above suspension, stir for 3 hours to disperse evenly, then add 0.09g of initiator ammonium persulfate to the suspension, stir and react for 3 hours, after the reaction is complete, dissolve the suspension Pour it into a suction filter bottle lined with a Celgard diaphragm and filter paper for suction filtration, and tear off the filter paper after drying to obtain a lithium-sulfur battery composite diaphragm.

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Abstract

The invention provides a preparation method of a lithium-sulfur battery composite separator. The lithium-sulfur battery composite separator comprises a commercial Celgard separator and a polyacrylonitrile/graphene oxide layer, wherein the polyacrylonitrile/graphene oxide layer is arranged on a surface of the commercial Celgard separator, the thickness of the polyacrylonitrile/graphene oxide layer is 1-10 micrometers, and the mass ratio of polyacrylonitrile and graphene oxide in the polyacrylonitrile/graphene oxide layer is (0.2-1):1. A Nitrile group on the polyacrylonitrile in the polyacrylonitrile/graphene oxide layer and oxygen on a surface of the graphene oxide are both strong polar groups, high chemical absorption can be formed on a polysulfide which is formed during the charge-discharge process, the polysulfide can be effectively prevented from penetrating through the separator to reach a negative electrode, a shuttle flying effect is reduced, and the lifetime of a lithium-sulfur battery is prolonged.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to a preparation method of a lithium-sulfur battery diaphragm. Background technique [0002] A lithium-sulfur battery is a battery system in which metallic lithium is used as the negative electrode and elemental sulfur is used as the positive electrode. Lithium-sulfur batteries have two discharge platforms (about 2.4 V and 2.1 V), but their electrochemical reaction mechanism is relatively complicated. Lithium-sulfur batteries have the advantages of high specific energy (2600 Wh / kg), high specific capacity (1675 mAh / g), and low cost, and are considered to be a promising new generation of batteries. However, at present, there are problems such as low utilization of active materials, low cycle life and poor safety, which seriously restrict the development of lithium-sulfur batteries. The main reasons for the above problems are as follows: (1) elemental sulfur is an electronic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/446H01M50/449
CPCH01M50/446H01M50/403H01M50/449Y02E60/10
Inventor 钟玲珑
Owner SHENZHEN PEICHENG TECH CO LTD
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