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Three-dimensional lithium sulfide electrode for lithium-sulfur battery and preparation method of three-dimensional lithium sulfide electrode

A lithium sulfide and sulfur battery technology, applied in the field of electrochemical energy storage, can solve problems such as difficulty in mass production, easy hydrolysis and oxidation, and low conductivity, and achieve the effects of simple preparation process, reduced interface resistance, and accelerated electrochemical reaction

Active Publication Date: 2020-09-04
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of easy hydrolysis and oxidation, difficulty in batch production, low conductivity and low stability in the preparation process of lithium sulfide electrodes, the present invention provides a kind of cheap raw material, avoiding the hydrolysis and oxidation of lithium sulfide, and the preparation process is simple and easy to operate. It can be matched with the existing production line for preparing electrodes by scraping coating method, suitable for quantitative production, and a preparation method of three-dimensional lithium sulfide electrodes with excellent electrochemical performance

Method used

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  • Three-dimensional lithium sulfide electrode for lithium-sulfur battery and preparation method of three-dimensional lithium sulfide electrode
  • Three-dimensional lithium sulfide electrode for lithium-sulfur battery and preparation method of three-dimensional lithium sulfide electrode
  • Three-dimensional lithium sulfide electrode for lithium-sulfur battery and preparation method of three-dimensional lithium sulfide electrode

Examples

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Effect test

Embodiment 1

[0032] Step 1. Mix and grind lithium sulfate, carbon black and polyvinylidene fluoride according to the mass ratio of 6:3:1, then add an appropriate amount of N-methylpyrrolidone dropwise to make slurry, and then scrape the resulting slurry onto carbon fiber cloth Lithium sulfate electrode was obtained after drying.

[0033] Step 2: heat-treat the lithium sulfate electrode at 660° C. for 2 hours and 900° C. for 2 hours in an argon atmosphere to obtain a three-dimensional lithium sulfide electrode.

[0034] Carry out X-ray powder diffraction (XRD) test to the three-dimensional lithium sulfide electrode that present embodiment prepares, and its test result is as follows figure 1 As shown, it can be seen from the figure that the diffraction peak of lithium sulfide appears in the XRD spectrum of the electrode, indicating that lithium sulfide is successfully prepared by this method.

[0035] The three-dimensional lithium sulfide electrode prepared in this example is directly used ...

Embodiment 2

[0038] Step 1. Mix and grind lithium sulfate, carbon black and polyvinylidene fluoride according to the mass ratio of 7:2:1, then add an appropriate amount of N-methylpyrrolidone dropwise to make slurry, and then scrape the resulting slurry onto carbon fiber cloth Lithium sulfate electrode was obtained after drying.

[0039] Step 2: heat-treat the lithium sulfate electrode at 660° C. for 2 hours and 900° C. for 2 hours in an argon atmosphere to obtain a three-dimensional lithium sulfide electrode.

[0040] The XRD test was carried out on the three-dimensional lithium sulfide electrode prepared in this example, and the test results showed that lithium sulfide diffraction peaks appeared in the XRD spectrum of the electrode, indicating that lithium sulfide was successfully prepared by this method.

[0041] The three-dimensional lithium sulfide electrode prepared in the present embodiment is subjected to a scanning electron microscope test, and the test results are as follows: f...

Embodiment 3

[0047] Step 1. Mix and grind lithium sulfate, carbon nanotubes and polyvinylidene fluoride according to the mass ratio of 7:2:1, then add an appropriate amount of N-methylpyrrolidone dropwise to make a slurry, and then scrape the resulting slurry onto the carbon fiber Cloth, after drying to obtain a lithium sulfate electrode.

[0048] Step 2, heat-treating the lithium sulfate electrode at 660° C. for 2 hours and 900° C. for 2 hours in an argon atmosphere to obtain a three-dimensional lithium sulfide electrode.

[0049] The XRD test was carried out on the three-dimensional lithium sulfide electrode prepared in the example, and the test results showed that lithium sulfide diffraction peaks appeared in the XRD spectrum of the electrode, indicating that lithium sulfide was successfully prepared by this method.

[0050] Carry out X-ray photoelectron spectroscopy test to the three-dimensional lithium sulfide electrode prepared by embodiment, its F1s peak is as follows Figure 4 As ...

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Abstract

The invention provides a three-dimensional lithium sulfide electrode for a lithium-sulfur battery and a preparation method of the three-dimensional lithium sulfide electrode. The preparation method comprises the following steps: mixing lithium sulfate with a conductive agent and a binder, carrying out grinding and size mixing, coating a three-dimensional porous conductive substrate with the slurryby adopting a blade coating method, carrying out drying to obtain a lithium sulfate electrode, and finally carrying out heat treatment on the lithium sulfate electrode in a dry inert atmosphere or under a vacuum condition to directly prepare the three-dimensional lithium sulfide electrode. According to the preparation method disclosed by the invention, the problems of hydrolysis and oxidation inthe preparation process of the lithium sulfide electrode are solved, and the electrochemical performance of the lithium sulfide electrode is improved to a great extent; besides, the raw materials arelow in price, the preparation process is simple and easy to operate, and the method can be matched with an existing production line for preparing the electrode by the blade coating method and is suitable for quantitatively producing the lithium sulfide electrode.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and more specifically relates to a preparation method of a three-dimensional lithium sulfide electrode and its application in lithium-sulfur batteries. Background technique [0002] The theoretical discharge specific capacity of elemental sulfur is 1675mAh g -1 , when it forms a lithium-sulfur battery with metallic lithium, its theoretical energy density is as high as 2600Wh kg -1 , coupled with the advantages of a wide operating temperature range, abundant resources, low price, and environmental friendliness, lithium-sulfur batteries are recognized as the representative of the next-generation power battery system. However, the use of metallic lithium as the negative electrode of lithium-sulfur batteries will cause the following problems during the charge and discharge process: the formation of lithium dendrites to pierce the separator, the reaction of metallic lithium with the elec...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/052
CPCH01M4/5815H01M4/625H01M10/052H01M2004/028Y02E60/10
Inventor 孙振杰张家民蒋阳高岩周雅石鹏翔贺雅欣孙满满蒋帅威
Owner HEFEI UNIV OF TECH
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