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A kind of preparation method of carbon composite positive electrode

A carbon composite and positive electrode technology, which is applied in the field of sodium batteries, can solve the problems of poor rate performance and achieve the effects of improving processing performance, high discharge specific energy, increasing rate and cycle performance

Active Publication Date: 2017-09-12
紫石能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rate performance is relatively poor, so there is an urgent need for a method for preparing anode materials for sodium-ion batteries that can increase the specific power of the battery and improve the cycle performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using mass ratio of 75% ground and sieved NaMnO 2 The substrate, activated carbon with a mass ratio of 25%, and ethanol are mixed evenly, and ground again to form a slurry; according to the slurry: conductive agent: binder = 80:10:10, that is, 80% slurry, 10% conductive agent, bonding The mass ratio of 10% of the agent and the solvent is adjusted to an active solution, which is fully mixed by high-speed shearing; the active material is obtained by evaporating the active solution at 45°C, and then kneaded, rolled and other steps are made into a soft film with a thickness of 200 μm . Cut it into a φ12mm disc, press it on a nickel foam current collector of a suitable size, dry it, and weigh it to make a positive electrode sheet.

[0026] The preparation process of the negative electrode of the battery is the same as that of the positive electrode, and the active material of the negative electrode: conductive agent: binder = 80:10:10. According to the positive and negativ...

Embodiment 2

[0029] Using mass ratio of 99% ground and sieved NaMnO 2 The base material, carbon nanotubes with a mass ratio of 1% and propanol are mixed evenly, and then ground again to form a slurry; according to the slurry: conductive agent: binder = 75:5:20, that is, 75% of the slurry and 5% of the conductive agent , the mass ratio of 20% of the binder is mixed with the solvent to form an active solution, which is mixed by mechanical stirring; the active material is obtained by evaporating the active solution at 45 ° C, and then kneading, rolling and other steps are made into a soft film with a thickness of 210 μm . Cut it into a φ15mm disc, press it on a nickel foam current collector of a suitable size, dry it, and weigh it to make a positive electrode sheet.

[0030] The preparation process of the negative electrode of the battery is the same as that of the positive electrode, and the active material of the negative electrode: conductive agent: binder = 80:10:10. According to the po...

Embodiment 3

[0033] Using 60% mass ratio of ground and sieved NaMnO 2 The substrate, mesoporous carbon with a mass ratio of 40%, and isopropanol are mixed evenly, and then ground to form a slurry; according to the slurry: conductive agent: binder = 79:20:1, that is, the slurry is 79%, the conductive agent is 20 %, the mass ratio of 1% of the binder is mixed with a solvent to form an active solution, which is fully mixed by ball milling; the active material is obtained by evaporating the active solution at 45°C, and then kneading, rolling and other steps to make a soft material with a thickness of 250 μm. Diaphragm. Cut it into a φ10mm disc, press it on a nickel foam current collector of a suitable size, dry it, and weigh it to make a positive electrode sheet.

[0034] The preparation process of the negative electrode of the battery is the same as that of the positive electrode, and the active material of the negative electrode: conductive agent: binder = 80:10:10. According to the positi...

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Abstract

The invention provides a making method of a carbon composite electrode. 1-10% by mass of a carbon material is added to a sodium-containing intercalation compound base material. The carbon composite electrode made by adding the carbon material with good conductivity into the sodium-containing intercalation compound in the invention has a high cell specific power and an excellent cell cycle performance.

Description

technical field [0001] The invention relates to a method for preparing a carbon composite positive electrode, in particular to a method for preparing a carbon composite positive electrode in the field of sodium batteries. Background technique [0002] With the continuous development of society, human beings' dependence on energy is gradually increasing. However, most of the traditional energy sources are non-renewable energy sources, which are facing the danger of depletion with the increase of mining and usage. In recent years, some renewable clean energy sources, such as nuclear energy, water energy, wind energy, and solar energy, have gradually become research hotspots in various countries. For energy sources such as wind energy and solar energy, they often have the characteristics of dispersion and large fluctuations in energy supply. A more reliable energy storage system is needed to obtain a relatively stable output. [0003] At present, energy storage systems have v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/04H01M4/02
CPCH01M4/139H01M4/362H01M4/505H01M4/525H01M4/5825H01M4/625H01M10/05Y02E60/10
Inventor 侯珊珊李长青
Owner 紫石能源有限公司