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Selenium-micropore carrier composite, preparation method and application thereof

A microporous carrier and composite technology, applied in the field of electrochemical power sources, can solve problems such as unstable function, unsatisfactory battery capacity, and low discharge voltage of selenium

Active Publication Date: 2013-07-03
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN101794844A discloses a copper fluoride-selenium nanocomposite negative electrode material for lithium ion batteries and a preparation method thereof, wherein copper fluoride and elemental selenium are formed into a nanocomposite material by laser sputtering, and the nanocomposite material is used as Lithium-ion thin film battery negative electrode material, but the battery capacity of the battery obtained in this way is still not ideal
[0005] CN102623678A discloses a preparation method of Li-Se batteries and lithium battery electrode materials, which discloses the use of thermal evaporation to grow selenium microspheres on substrates and grow selenium nanowires or nanometers on substrates loaded with gold catalysts. It is used as a lithium battery material, but since the noble metal gold needs to be used in this invention, and the selenium vapor reacts in a fluid atmosphere, it will cause a great waste of selenium. In addition, selenium is deposited on the surface of the substrate, and the effect is unstable and easy The most important thing is that in this invention, the discharge voltage of selenium as a positive electrode material is too low (about 0.25V), and for lithium battery electrode materials, the voltage platform is below 1V and can only be used as a negative electrode material

Method used

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  • Selenium-micropore carrier composite, preparation method and application thereof
  • Selenium-micropore carrier composite, preparation method and application thereof
  • Selenium-micropore carrier composite, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Preparation of selenium-microporous support composite positive electrode

[0043] The microporous carrier used in the experiment is microporous carbon (purchased from Japan Kuraray Co.), with a specific surface area of ​​920m 2 g -1 , the pore volume is 0.50cm 3 g -1 , the average pore size is 0.6nm, and the mass fraction of selenium in the prepared selenium-microporous carbon composite is 60%.

[0044] The preparation method of selenium-microporous carbon composite is as follows:

[0045] (1) Weigh selenium and microporous carbon according to the mass ratio of 3:2 and mix them evenly;

[0046] (2) The mixture of selenium and microporous carbon was heated at 0.2°C min -1 The heating rate is heated to 215 ° C and maintained for 12 hours, so that selenium is fully dispersed in the microporous carbon;

[0047] (3) Stop heating and return to room temperature to obtain a selenium-microporous carbon composite.

[0048] figure 1 Is the Raman spectrum of the seleniu...

Embodiment 2

[0060] (1) Preparation of selenium-microporous support composite positive electrode

[0061] The microporous carrier used in the experiment is microporous ferric oxide (purchased from Sigma-Aldrich Company), with a specific surface area of ​​300 m 2 g -1 , the pore volume is 0.2cm 3 g -1 , the average pore size is 1.6nm, and the mass fraction of selenium in the prepared selenium-microporous ferric oxide composite is 30%.

[0062] The preparation method of selenium-microporous ferric oxide complex is as follows:

[0063] (1) Weigh selenium and microporous ferric oxide according to the mass ratio of 3:7 and mix them evenly;

[0064] (2) The mixture of selenium and microporous ferric oxide was heated at 3°C ​​min -1 The heating rate is heated to 230 ° C and maintained for 5 hours, so that selenium is fully dispersed in the microporous ferric oxide;

[0065] (3) Stop heating and return to room temperature to obtain a selenium-microporous ferric oxide complex.

[0066] (2) P...

Embodiment 3

[0073] (1) Preparation of selenium-microporous support composite positive electrode

[0074] The microporous carrier used in the experiment is a microporous metal-organic framework coordination polymer (MIL-100(Cr), which is a coordination polymer formed by chromium and trimesic acid, purchased from Materiaux Institut Lavoisier Company), and the specific surface area 4000m 2 g -1 , the pore volume is 2cm 3 g -1 , the average pore size is 1.2nm, and the mass fraction of selenium in the prepared selenium-microporous metal-organic framework composite is 80%.

[0075] The preparation method of the selenium-microporous metal-organic framework composite is as follows:

[0076] (1) Weigh the selenium and the microporous metal-organic framework according to the mass ratio of 4:1 and mix them uniformly;

[0077] (2) The mixture of selenium and microporous MOFs was heated at 8°C min-1 The heating rate is heated to 265 ° C and maintained for 18 hours, so that selenium is fully dispe...

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Abstract

The invention discloses a lithium-selenium battery and a preparation method thereof. A lithium-selenium battery comprises a metal lithium cathod, a selenium-micropore carrier composite anode and organic electrolyte. The selenium-micropore carrier composite anode is prepared by mixing selenium and a micropore carrier and heating; and the selenium is uniformly dispersed inside micropore channels of the micropore carrier in a short-chain molecule manner. The micropore carrier comprises a carbon micropore carrier, a non-carbon micropore carrier and a composition. The lithium-selenium battery can maintain a high circulation capacity, excellent stable circulation property and good high-magnification (large-current density charging and discharging) property in a large-temperature range such as room temperature and the like; the main composite part, namely, the selenium-micropore carrier composite anode, is simple in preparation method, easily accessible in raw material, applicable to large-scale production and has very high practicability.

Description

technical field [0001] The invention belongs to the field of electrochemical power sources, and specifically relates to a selenium-porous carrier composite, a preparation method thereof, a selenium-porous carrier composite positive electrode material and a preparation method thereof, a preparation method of a positive electrode containing the composite, and a new type of positive electrode using the composite Lithium-selenium batteries and their applications in high volume energy density energy storage devices. Background technique [0002] Lithium-selenium battery refers to a type of metal lithium secondary battery that uses elemental selenium or selenium-containing compounds as the positive electrode and metallic lithium as the negative electrode, and realizes the mutual conversion between chemical energy and electrical energy through the chemical reaction between selenium and lithium. Elemental selenium, because of its two-electron reaction in the electrochemical reaction...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M4/134H01M4/1395H01M10/052
CPCY02E60/10
Inventor 郭玉国辛森殷雅侠万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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