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Electrode material and preparation method thereof

An electrode material and carbon matrix technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as hindering the potential performance of materials, low total electrode capacity, restricting the development of lithium-sulfur and sodium-sulfur secondary batteries, etc. The effect of high active components and high battery utilization

Active Publication Date: 2014-04-30
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

It can be seen that lithium-sulfur and sodium-sulfur secondary batteries can better meet the four aspects of future power battery requirements, namely high energy density, better safety, environmental protection and low cost; the disadvantage is that sulfur-based Poor cycle performance of cathode materials restricts the development of lithium-sulfur and sodium-sulfur secondary batteries, which is also the focus of current research on lithium-sulfur and sodium-sulfur secondary batteries
The first disadvantage is that the capacity of the prepared carbon / sulfur composite electrode material decays rapidly during the cycle. For example, after 20 charges and discharges, the capacity decays by more than 10%.
The second disadvantage is that the mesoporous carbon / sulfur composite material prepared by this method contains less active material-sulfur, which leads to a low total capacity of the electrode
These two shortcomings not only hinder the potential performance of the material, but also bring certain limitations to practical applications.

Method used

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  • Electrode material and preparation method thereof
  • Electrode material and preparation method thereof
  • Electrode material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0026] Example 1 uses nano-copper-stabilized sulfur composite material as the electrode material, and porous carbon as the carbon matrix. Among them, the sulfur content exceeds 50%, and the micropores of the porous carbon are used to accommodate nano-copper-stabilized sulfur. The pore diameter of the micropore is 5nm, and the specific surface area of ​​the porous carbon is 1100m 2 / g.

[0027] figure 1 is a transmission electron microscope digital image of the electrode material of the present invention.

[0028] Such as figure 1 As shown, it can be observed that nano-metal polysulfides exist in the porous carbon matrix, and the nano-metal polysulfides fill the micropores in the carbon matrix.

[0029] figure 2 is the thermogravimetric analysis spectrum of the electrode material of the present invention;

[0030] Such as figure 2 As shown, the weight of the electrode material begins to decrease at 200°-300°, and when the temperature is close to 500°, its weight reache...

Embodiment 2

[0041] This embodiment provides the preparation method of the nano-copper-stabilized sulfur composite electrode material in Embodiment 1, and its specific steps are as follows:

[0042] Step 1: Load copper nitrate on porous carbon matrix

[0043] At room temperature, calculate the weight according to the ratio of copper content / porous carbon content of 1:10, accurately weigh copper nitrate and porous carbon, dissolve copper nitrate in water, and load it into the porous carbon matrix through ultrasonic assisted infiltration After neutralization, vacuum-dry at 100°C.

[0044] Step 2: Carry out hydrogen reduction reaction

[0045] The porous carbon loaded with copper nitrate obtained in step 1 was subjected to hydrogen reduction reaction at 400° C. for 5 hours to prepare the porous carbon loaded with copper nanoparticles.

[0046] In step 3, the porous carbon loaded with nano-copper obtained in step 2 is added dropwise to a pre-prepared carbon disulfide solution with a sulfur c...

Embodiment 3

[0050] This embodiment is a preparation method of a nano-nickel stabilized sulfur-in-mesoporous carbon composite electrode material with high capacity, high rate and good cycle stability. The specific steps are as follows:

[0051] Step 1: Nickel chloride loaded on the mesoporous carbon matrix

[0052] At room temperature, calculate the weight according to the ratio of nickel content / mesoporous carbon content of 1:10, accurately weigh nickel chloride and mesoporous carbon, dissolve nickel chloride in water, and load it into After being placed in the mesoporous carbon matrix, it was vacuum-dried at 100 °C.

[0053] Step 2: Hydrogen reduction reaction

[0054] The mesoporous carbon loaded with nickel chloride obtained in step 1 was subjected to hydrogen reduction reaction at 400° C. for 5 hours to prepare the mesoporous carbon loaded with nickel nanoparticles.

[0055] Step 3: The nano-nickel-loaded mesoporous carbon obtained in step 2 is added dropwise to a pre-prepared carbo...

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Abstract

The invention provides an electrode material and a preparation method thereof. The electrode material is characterized by comprising a porous carbon matrix and nanocrystalline metal polysulfide, wherein the nanocrystalline metal polysulfide is filled in pores of the porous carbon matrix; the sulfur content of the electrode material is more than 50 percent. The preparation method is characterized by comprising the following steps: 1, dissolving a metal salt in water, loading the prepared metal salt solution into the porous carbon matrix through a penetration technology, and drying the carbon matrix; 2, performing a reduction reaction on the carbon matrix loaded with the metal salt in the step 1, and preparing a carbon matrix loaded with nano metal particles; and 3, dripping the prepared sulfur-containing carbon disulfide solution into the carbon matrix loaded with nanocrystalline metals, reacting, removing the solvent through a drying process, and preparing the electrode material. According to the electrode material, the cycle performance of the electrode material can be improved, the high-rate performance is also improved, and the electrode material has high practicality.

Description

technical field [0001] The invention relates to an electrode material and a preparation method thereof. Background technique [0002] With the development of society, people pay more and more attention to environmental protection. Acid rain, greenhouse effect, urban heat island effect and other environmental problems may be on the horizon, or cause great harm to human beings. The emergence of these environmental problems is largely related to the extensive use of fossil energy by humans. At the same time, due to the rapid increase in energy consumption, fossil energy will not be able to meet the needs of rapid economic development, and countries around the world are shifting their attention to the development and utilization of new energy. The development of new energy and renewable clean energy technologies is the most decisive technology in the development of the world economy in the 21st century. Among them, chemical energy storage devices such as energy storage batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCH01M4/5815H01M10/0525Y02E60/10
Inventor 郑时有杨俊和
Owner UNIV OF SHANGHAI FOR SCI & TECH