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Mesoporous carbon loaded sulfur/selenium flexible electrode based on three-dimensional graphite alkene self-supporting structure as well as preparation method and application thereof

A self-supporting structure, flexible electrode technology, applied in battery electrodes, structural parts, non-aqueous electrolyte battery electrodes, etc., can solve problems such as electrode energy density reduction, and achieve the effect of shortening the diffusion distance, improving transportation, and high capacity.

Active Publication Date: 2014-05-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The results of the above patents show that the mesoporous carbon structure can effectively inhibit the dissolution of polysulfide or polyselenide, thereby delaying the capacity fading of the battery and improving the life of the battery; , the binder is mixed and coated on the current collector to be used as an electrode
The above process requires sufficient control and precise mixing, and at the same time, due to the addition of conductive agents, binders and current collectors, the energy density of the electrode is greatly reduced

Method used

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  • Mesoporous carbon loaded sulfur/selenium flexible electrode based on three-dimensional graphite alkene self-supporting structure as well as preparation method and application thereof
  • Mesoporous carbon loaded sulfur/selenium flexible electrode based on three-dimensional graphite alkene self-supporting structure as well as preparation method and application thereof
  • Mesoporous carbon loaded sulfur/selenium flexible electrode based on three-dimensional graphite alkene self-supporting structure as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. The nickel foam cleaned by ethanol ultrasonic cleaning is heated to 900°C in a nitrogen atmosphere, and hydrogen and ethanol gas are introduced. Under the self-catalysis of the foam nickel, the graphene layered structure grows on the surface of the foam metal to obtain a three-dimensional foam Nickel-graphene is soaked in 100ml concentrated nitric acid with a mass fraction of 65% for 24 hours; it is washed with deionization until the solution is neutral, then soaked with ethanol and ether in turn, and vacuum-dried at 50°C for 8 hours after taking it out; Three-dimensional graphene self-supporting materials;

[0036] 2. Mix triblock copolymer F127, phenolic resin and absolute ethanol in a mass ratio of 1:1:1, stirring temperature is 50°C, stirring time is 8 hours, after stirring evenly, a yellow solution is obtained;

[0037] 3. Immerse the mesoporous carbon precursor solution into the three-dimensional graphene self-supporting material. After standing at room tempera...

Embodiment 2

[0043] 1. Heat up the nickel foam that has been ultrasonically cleaned with ethanol to 900°C in a nitrogen atmosphere, and feed hydrogen and ethanol gas. Under the self-catalysis of foamed nickel, the graphene layered structure grows on the surface of foamed nickel, and the obtained three-dimensional foamed nickel-graphene is soaked in 10ml68% concentrated nitric acid for 5 hours; wash with deionization until the solution is neutral , after soaking with ethanol and ether in turn, and vacuum drying at 20°C for 10 hours after taking it out, the three-dimensional graphene self-supporting material is obtained;

[0044] 2. Mix the triblock copolymer F127, phenolic resin and absolute ethanol in a mass ratio of 1:1:1, the stirring temperature is 20°C, and the stirring time is 15 hours. After stirring evenly, a yellow solution is obtained;

[0045] 3. Immerse the mesoporous carbon precursor solution into the three-dimensional graphene self-supporting material, and after standing at ro...

Embodiment 3

[0049] 1. Heat up the foam iron cleaned by ethanol ultrasonically to 700°C in an argon atmosphere, and then pass in hydrogen and ethanol gas. Under the self-catalysis of foam iron, the graphene lamellar structure grows on the surface of foam iron, and the three-dimensional foam iron-graphene that obtains is put into mass fraction and is soaked in 55ml concentrated nitric acid of 66% for 15 hours; Wash with deionization until the solution is Neutral, after soaking with ethanol and ether in turn, take it out and dry it in vacuum at 80°C for 6 hours to obtain a three-dimensional graphene self-supporting material;

[0050] 2. Mix triblock copolymer P123, phenolic resin and absolute ethanol at a mass ratio of 15:5:3, stirring temperature is 80°C, stirring time is 1h, after stirring evenly, a yellow solution is obtained;

[0051] 3. Immerse the mesoporous carbon precursor solution into the three-dimensional graphene self-supporting material, and after standing at room temperature fo...

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Abstract

The invention discloses a mesoporous carbon loaded sulfur / selenium flexible electrode based on a three-dimensional graphite alkene self-supporting structure. The invention further discloses a preparation method of the electrode, and application of the mesoporous carbon loaded sulfur / selenium flexible electrode based on the three-dimensional graphite alkene self-supporting structure in preparing a lithium ion secondary battery. The invention further discloses a lithium-sulfur battery and a lithium-selenium battery both comprising the electrode. The mesoporous carbon loaded sulfur / selenium flexible electrode based on the three-dimensional graphite alkene self-supporting structure, provided by the invention, has good mechanical performance and electrical performance, can effectively improve the specific energy intensity of the electrode; the lithium-sulfur(selenium) battery manufactured by adopting the electrode has the advantages of small size, high capacity, long service life and high efficiency, and has very high application potential and commercial value.

Description

technical field [0001] The invention belongs to the field of battery material science, and in particular relates to a mesoporous carbon-loaded sulfur / selenium flexible electrode based on a three-dimensional graphene self-supporting structure and a preparation method and application thereof. Background technique [0002] Lithium-sulfur and lithium-selenium batteries are two types of lithium-ion secondary battery systems with high energy density that are currently being jointly developed by academia and industry. They are the representative and direction of secondary batteries with high energy density performance. Compared with other batteries, lithium-sulfur batteries have the advantages of high energy density (the theoretical volume specific capacity of elemental sulfur is 3467mAh / cm3), abundant sulfur resources, environmental friendliness, and low price; lithium-selenium batteries have similar characteristics to lithium-sulfur batteries. The volume specific capacity (3253mA...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M10/052
CPCH01M4/13H01M4/139H01M4/38H01M4/387H01M10/052Y02E60/10
Inventor 范奇孙岳明王育乔雷立旭齐齐尹桂代云茜郑颖平蒋伟
Owner SOUTHEAST UNIV
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