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Aluminum sulfur composite material as well as preparation method and application thereof

A technology of composite materials and aluminum balls, applied in electrical components, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of too fast attenuation in the cycle process, few considerations, low sulfur utilization rate, etc., to improve the rate performance And cycle performance, reduce the volume change rate, improve the effect of sulfur utilization

Active Publication Date: 2018-06-08
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The conductivity of sulfur element is very low (5*10-30Scm -1 at 25°C);
[0004] (2) Large volume change rate (up to 80%) during charging and discharging;
[0006] These problems lead to low sulfur utilization rate, poor rate performance, and fast attenuation in the cycle process when elemental sulfur is used alone as the cathode material.
The usual way to alleviate the shuttle effect is to intercept the adsorption through the modification of the diaphragm or barrier layer. Few consider to find the means to solve the problem directly from the direction of changing the positive electrode material itself to limit the loss of sulfur.

Method used

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  • Aluminum sulfur composite material as well as preparation method and application thereof
  • Aluminum sulfur composite material as well as preparation method and application thereof
  • Aluminum sulfur composite material as well as preparation method and application thereof

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preparation example Construction

[0036] The present application also includes the preparation method of the aluminum-sulfur composite material, combining figure 1 As shown, it specifically includes the following steps:

[0037] (1) Preparation of hollow aluminum spherical shells: soak aluminum balls with a particle size of 1um-10um in dilute acid aqueous solution, and separate the aluminum balls after the bubbles escape evenly to obtain hollow aluminum spherical shells with pores distributed on the surface;

[0038] (2) Preparation of composite material of hollow aluminum spherical shell coated elemental sulfur: the hollow aluminum spherical shell obtained in step (1) and sulfur elemental are mixed and ground according to a certain mass ratio, then the mixture is put into a reactor, heated to make the reactor The temperature is higher than the melting temperature of sulfur element but lower than its flash point temperature (in this application generally refers to 113 ° C ~ 170 ° C) and heat preservation, to o...

example 1

[0042] Select aluminum balls with a particle size of 10um, prepare 1mol / L hydrochloric acid aqueous solution, soak the aluminum balls for 2 hours, wait for the bubbles to escape uniformly for about 0.5h, and then filter out the aluminum powder. Washing with deionized water, suction filtration, and drying to obtain hollow aluminum spherical shells. The prepared hollow aluminum spherical shell and sulfur powder were high-energy ball milled for 4 hours according to the mass ratio of 30:70, and then the prepared powder was put into a 200ML reactor, heated to 160°C, and kept for 4 hours to obtain a hollow aluminum shell. A composite material of aluminum spherical shell coated with elemental sulfur, which is used as the positive electrode material of lithium-sulfur battery.

[0043] Place the composite material of the hollow aluminum spherical shell coated with elemental sulfur obtained in this example under a scanning electron microscope to observe its morphology, as shown in fig...

example 2

[0045] Select aluminum balls with a particle size of 1um, prepare 0.1mol / L hydrochloric acid aqueous solution, soak the aluminum balls for 2 hours, wait for the bubbles to escape uniformly for about 1 hour, and then filter out the aluminum powder. Washing with deionized water, suction filtration, and drying to obtain hollow aluminum spherical shells. The prepared hollow aluminum spherical shell and sulfur powder were high-energy ball milled for 2 hours according to the mass ratio of 30:70, and then the prepared powder was put into a 200ML reaction kettle, heated to 150°C, and kept for 4 hours to obtain a hollow aluminum shell. A composite material of aluminum spherical shell coated with elemental sulfur, which is used as the positive electrode material of lithium-sulfur battery.

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Abstract

The invention relates to an aluminum sulfur composite material. The aluminum sulfur composite material comprises a hollow aluminum ball shell and elemental sulfur wrapped in the hollow aluminum ball shell; and pores are distributed in the hollow aluminum ball shell. The aluminum sulfur composite material has a composite type microstructure that the elemental sulfur is wrapped by the porous hollowaluminum ball shell; and when the composite material with the structure is made into a positive electrode of a lithium sulfur battery, the sulfur utilization rate of the battery can be increased, andthe rate performance and the cycle performance can be improved.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to an aluminum-sulfur composite material and its preparation method and application. Background technique [0002] Elemental sulfur is as high as 1675mA h g due to its theoretical specific capacity -1 , the theoretical energy density is as high as 2600Whkg -1 , and has a wide range of sources, is safe and non-toxic, and is considered to be a very promising next-generation cathode material for lithium batteries. However, when elemental sulfur is used alone as a positive electrode material, the following problems still exist: [0003] (1) The conductivity of sulfur element is very low (5*10-30Scm -1 at 25°C); [0004] (2) Large volume change rate (up to 80%) during charging and discharging; [0005] (3) The intermediate product lithium polysulfide (Li 2 S X ,4≤X≤8) are easily soluble in the electrolyte, so a shuttle effect is formed between the positive and negative...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/46H01M10/052
CPCH01M4/366H01M4/38H01M4/46H01M10/052Y02E60/10
Inventor 柯菲苗力孝
Owner SOUNDON NEW ENERGY TECH CO LTD
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