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A preparation method of polymer-coated sulfur composite material for positive electrode of lithium-sulfur battery

A technology of composite materials and polymers, applied in the field of electrochemistry, can solve the problems of low sulfur loading, sulfur dissolution, etc., and achieve the effects of simple preparation process, high initial discharge capacity, and improved cycle stability

Active Publication Date: 2017-02-01
DONGGUAN FENGBANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method for preparing a polymer-coated sulfur composite material in order to overcome the problems of relatively low sulfur load in the existing lithium-sulfur battery positive electrode composite material and the dissolution of sulfur during charging and discharging.

Method used

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  • A preparation method of polymer-coated sulfur composite material for positive electrode of lithium-sulfur battery
  • A preparation method of polymer-coated sulfur composite material for positive electrode of lithium-sulfur battery
  • A preparation method of polymer-coated sulfur composite material for positive electrode of lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Dissolve butadiene rubber and elemental sulfur in toluene, the mass ratio of butadiene rubber and elemental sulfur is 1:4, add ultraviolet light initiator dialkoxy acetophenone, the amount of ultraviolet light initiator is the mass of butadiene rubber After stirring evenly, under the protection of nitrogen, irradiate with 365 nm ultraviolet light for 12 hours, then separate the reaction product, wash, and dry to obtain the polymer-coated sulfur composite material. Its structure diagram is as follows figure 1 shown.

[0034] After infrared testing, it was found that the absorption peak of the C=C double bond in the infrared spectrum completely disappeared, indicating that the butadiene rubber had fully participated in the reaction; in addition, through the thermogravimetric test, the sulfur content in the composite material was 78.2 wt%.

[0035] Electrochemical performance test:

[0036] The polymer-coated sulfur composite material prepared above is used as the positiv...

Embodiment 2

[0043] Dissolve polyisobutene and elemental sulfur in toluene, the mass ratio of polyisobutylene and elemental sulfur is 1:9, add ultraviolet light initiator α-hydroxyalkyl phenone, the amount of ultraviolet light initiator is 1 wt of the mass of polyisobutylene %, after stirring evenly, under the protection of nitrogen, irradiate with 254 nm ultraviolet light for 2 hours, then separate the reaction product, wash and dry to obtain the polymer-coated sulfur composite material.

[0044] Infrared test results found that there is still an absorption peak of C=C in the infrared spectrum, indicating that the C=C reaction is not complete under the irradiation of ultraviolet light of this wavelength for 2 hours. In addition, by thermogravimetric test, the sulfur content in the composite material is 87.7 wt%.

[0045] Electrochemical performance test:

[0046] The composite material obtained in Example 2 was assembled into a button battery, and its preparation method was the same as t...

Embodiment 3

[0048] Dissolve butadiene rubber and elemental sulfur in toluene, the mass ratio of butadiene rubber and elemental sulfur is 1:9, add ultraviolet light initiator dialkoxy acetophenone, the amount of ultraviolet light initiator is the mass of butadiene rubber After stirring evenly, irradiate with 365 nm ultraviolet light for 2 hours under the protection of nitrogen, and then separate the reaction product, wash and dry to obtain the polymer-coated sulfur composite material.

[0049] After infrared testing, it was found that the absorption peak of the C=C double bond in the infrared spectrum completely disappeared, indicating that the butadiene rubber had fully participated in the reaction; in addition, the sulfur content in the composite material was 87.1 wt% through thermogravimetric testing.

[0050] Electrochemical performance test:

[0051] The composite material obtained in Example 3 is assembled into a button battery, and its preparation method is the same as that of Embod...

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Abstract

The invention provides a preparation method and an application of a polymer coated sulfur composite. The preparation method comprises the following steps of dissolving an unsaturated carbon-carbon double bond polymer and elemental sulfur in an organic solvent, then adding an ultraviolet initiator, uniformly mixing, carrying out ultraviolet irradiation under inert gas to allow the unsaturated carbon-carbon double bond polymer to carry out free radical polymerization reaction, and then separating obtained solid to prepare the polymer coated sulfur composite. The composite has a higher sulfur content, solves the problem of the lower sulfur content in the composite for a lithium-sulphur battery anode at present, effectively inhibits dissolution of sulfur and finally greatly improves cycling stability of an active material. In addition, a preparation technology is simple, the raw material cost is low, and the composite has good industrial and commercial prospects.

Description

technical field [0001] The invention relates to the field of electrochemistry, and more specifically, relates to a preparation method for a cathode material of a lithium-sulfur battery. Background technique [0002] With the depletion of fossil fuels and the aggravation of global environmental problems such as air pollution, there is an urgent need for a new type of renewable and clean energy to meet people's current energy needs. Due to the relatively high energy density of lithium-ion batteries, lithium-ion batteries have become the main power source of portable electronic products at present. However, traditional cathode materials for embedded lithium-ion batteries, such as LiCoO 2 , LiMn 2 o 4 and LiFePO 4 The theoretical and actual specific capacity of the battery is far from meeting the requirements of future electric vehicle applications, so it is of great significance to develop a new type of battery material with a higher specific capacity. The theoretical spe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/36H01M4/38H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 孟跃中孙振杰黄宁肖敏黄秋梓王拴紧
Owner DONGGUAN FENGBANG NEW ENERGY TECH
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