Porous carbon sphere packaged vanadium oxide heterogeneous core-shell sphere structure material and preparation method thereof, lithium-sulfur battery diaphragm and lithium-sulfur battery

A technology of core-shell structure and vanadium oxide, which is applied in the field of electrochemical materials, can solve the problems of increased electrolyte consumption, low conductivity, and reduced rate performance, etc., and achieves the effects of easy industrial scale-up production, low preparation cost, and easy realization

Active Publication Date: 2021-06-25
TONGJI UNIV
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  • Description
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Problems solved by technology

However, lithium-sulfur batteries also have the following problems: First, due to uneven lithium deposition, lithium dendrites will be formed during the cycle, resulting in damage, deactivation or even "dead lithium" of the lithium anode, which greatly increases the concentration of the electrolyte. Consumption, reducing the electrolyte and the reversibility of the lithium anode
In addition, the sharp Li dendrites can pierce the separator leading to short circuits and thermal runaway.
Second, the volume expansion during charging and discharging is large (~79%), resulting in easy damage to the structure
The third is that the sulfur cathode will generate soluble lithium polysulfides (LiPSs) during charge and discharge, and its conductivity is low.
[0004] At present, one of the functional modific

Method used

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  • Porous carbon sphere packaged vanadium oxide heterogeneous core-shell sphere structure material and preparation method thereof, lithium-sulfur battery diaphragm and lithium-sulfur battery
  • Porous carbon sphere packaged vanadium oxide heterogeneous core-shell sphere structure material and preparation method thereof, lithium-sulfur battery diaphragm and lithium-sulfur battery
  • Porous carbon sphere packaged vanadium oxide heterogeneous core-shell sphere structure material and preparation method thereof, lithium-sulfur battery diaphragm and lithium-sulfur battery

Examples

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preparation example Construction

[0040] The preparation method of lithium-sulfur battery separator is as follows:

[0041] In step S1, the porous carbon sphere material is uniformly dispersed in the ethanol solution to obtain a pre-coating solution.

[0042] In step S2, the pre-coating solution is evenly coated on the surface of the separator body, and vacuum-dried at 30° C. to obtain a lithium-sulfur battery separator.

[0043] Among them, the diaphragm body is a polypropylene diaphragm, and the polypropylene diaphragm is a commercial diaphragm Clegard2400.

[0044] The preparation method of lithium-sulfur battery is as follows:

[0045] With metal lithium as the counter electrode, sulfur as the working electrode, and 1M LiPF6 dissolved in a mixed solution of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) (volume ratio 1:1) as the electrolyte, the lithium-sulfur battery The diaphragm acts as a diaphragm. The battery was assembled in a glove box filled with argon, and after the battery was assemb...

Embodiment 1

[0047] This example describes in detail the porous carbon sphere-encapsulated vanadium oxide heterogeneous core-shell sphere structure material, lithium-sulfur battery separator, lithium-sulfur battery and the preparation method.

[0048] The preparation method of the porous carbon sphere-encapsulated vanadium oxide heterogeneous core-shell sphere structure material (hereinafter referred to as the porous carbon sphere material) of this embodiment is as follows:

[0049] Step 1: Mix 70mL of ethanol, 10mL of water and 3mL of ammonia water, then add 3.46mL of tetraethyl orthosilicate into the reaction system, stir magnetically for 15 minutes, then add 0.4g of resorcinol and 0.56mL aqueous formaldehyde solution, stirring continuously for 24h.

[0050] Step 2: After the stirring in step 1, the precipitate was collected by centrifugation, washed with deionized water and ethanol, and dried in vacuum at 60° C. for 12 hours to obtain a carbon-coated silica core-shell structure.

[005...

Embodiment 2

[0072] This example describes in detail the porous carbon sphere-encapsulated vanadium oxide heterogeneous core-shell sphere structure material and its preparation method.

[0073] The preparation method of the porous carbon sphere-encapsulated vanadium oxide heterogeneous core-shell sphere structure material (hereinafter referred to as the porous carbon sphere material) of this embodiment is as follows:

[0074] Step 1: Mix 70mL of ethanol, 10mL of water and 3mL of ammonia water, then add 3.46mL of tetraethyl orthosilicate into the reaction system, stir magnetically for 15 minutes, then add 0.4g of resorcinol and 0.56mL aqueous formaldehyde solution, stirring continuously for 24h.

[0075] Step 2: After the stirring in step 1, the precipitate was collected by centrifugation, washed with deionized water and ethanol, and dried in vacuum at 60° C. for 12 hours to obtain a carbon-coated silica core-shell structure.

[0076] Step 3, place the carbon-coated core-shell structure ob...

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Abstract

The invention belongs to the field of electrochemical materials, and provides a porous carbon sphere packaged vanadium oxide heterogeneous core-shell sphere structure material and a preparation method thereof, a lithium-sulfur battery diaphragm and a lithium-sulfur battery. The preparation method of the porous carbon sphere encapsulated vanadium oxide heterogeneous core-shell sphere structure material comprises the following steps: stirring water, ethanol, ammonia water, tetraethyl orthosilicate, resorcinol and formaldehyde, carrying out a stirring reaction to obtain a carbon-coated silicon dioxide core-shell structure, carbonizing the carbon-coated silicon dioxide core-shell structure, adding the carbon-coated silicon dioxide core-shell structure into a sodium hydroxide solution to obtain a hollow porous carbon sphere, mixing ammonium metavanadate, ethanol and nitric acid to obtain a vanadium oxide solution, adding the hollow porous carbon spheres into the vanadium oxide solution, and carrying out ultrasonic treatment and hydrothermal reaction to obtain a product. According to the invention, the amount of a vanadium oxide precursor entering porous carbon spheres is controlled by adjusting ultrasonic time so as to achieve manual control of a nano structure, and the product takes the non-polar carbon spheres as a surface layer so as to achieve an adsorption effect on polysulfide and show high conversion efficiency when sulfur exists in the inner layer.

Description

technical field [0001] The invention belongs to the field of electrochemical materials, and in particular relates to a porous carbon sphere-encapsulated vanadium oxide heterogeneous core-shell sphere structure material and a preparation method thereof, a lithium-sulfur battery diaphragm and a lithium-sulfur battery. Background technique [0002] Lithium-sulfur batteries have high theoretical energy density (2600Wh kg-1) and specific capacity (1675 mAh g-1). In addition, sulfur has low toxicity and environmental friendliness, and is cheap, so lithium-sulfur batteries are considered to be the most Potential next-generation energy storage system. However, lithium-sulfur batteries also have the following problems: First, due to uneven lithium deposition, lithium dendrites will be formed during the cycle, resulting in damage, deactivation or even "dead lithium" of the lithium anode, which greatly increases the concentration of the electrolyte. Consumption, reducing the reversibi...

Claims

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Application Information

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IPC IPC(8): H01M50/431H01M50/443H01M50/449H01M50/489H01M10/052
CPCH01M10/052Y02E60/10
Inventor 高国华肖强凤梁兴纪明泽倪洁
Owner TONGJI UNIV
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