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Preparation method and application of graphene-based composite electrode material

A graphene-based, composite electrode technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve problems such as attenuation, electrode damage capacity, cycle stability and electrical conductivity to be further improved, and achieve low cost and improved Capacity performance, the effect of improving cycle stability

Inactive Publication Date: 2021-10-22
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these materials suffer from drastic volume changes during charge and discharge, resulting in electrode damage and rapid capacity fading.
To alleviate this problem, these high-capacity materials are composited with carbon, but the cycle stability and electrical conductivity of this composite material still need to be further improved

Method used

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  • Preparation method and application of graphene-based composite electrode material
  • Preparation method and application of graphene-based composite electrode material
  • Preparation method and application of graphene-based composite electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In this embodiment, a silicon / tin-doped graphene-based composite electrode material is prepared, and the specific process is as follows:

[0040] (1) SiO 2 Mix it with graphene oxide at a mass ratio of 1:9 and put it into a certain container, pour N-methylpyrrolidone into the mixture as a solvent, and perform magnetic stirring at a speed of 300rpm. After stirring for 2 hours, place the container in a nanomaterial disperser In the process, ultrasonic for 2 hours, the ultrasonic power is 300W, the slurry after ultrasonic is washed with deionized water several times, put in a drying oven at 80°C and dried for 20 hours to obtain SiO 2 / graphene oxide composites, where SiO 2 The particle size D50 is about 30nm, the size of graphene is 1-5μm, and the material comes from Aladdin or Sinopharm;

[0041] (2) Pour ethylene glycol into the container, add 2 times of SnCl 2 2H 2 O, nitrogen was passed through, and after magnetic stirring for 2 h, SiO was added 2 / Graphene Oxide ...

Embodiment 2

[0046] In this embodiment, a silicon / tin-doped graphene-based composite electrode material is prepared, and the specific process is as follows:

[0047] (1) Weigh graphene oxide, grind it with a mortar, put the powder into a crucible, put it in a tube furnace, and sinter at 800°C for 6 hours under a nitrogen or argon atmosphere to obtain reduced graphene oxide;

[0048] (2) SiO 2 Mix it with reduced graphene oxide at a mass ratio of 1:9 and put it into a certain container, pour N-methylpyrrolidone into the mixture as a solvent, and perform magnetic stirring at a speed of 300rpm. After stirring for 2 hours, place the container in a nanomaterial dispersion In the device, ultrasonic 2h, ultrasonic power is 300W, the slurry after ultrasonic is washed with deionized water for many times, put into the drying oven at 80 ℃ and dried for 20h to obtain SiO 2 / graphene-based composite materials;

[0049] (3) Pour ethylene glycol into the container, add 2 times of SnCl 2 2H 2 O, nitr...

Embodiment 3

[0056] In this embodiment, a silicon / tin-doped graphene-based composite electrode material is prepared, and the specific process is as follows:

[0057] (1) Weigh graphene oxide and melamine, mix and grind them at a mass ratio of 1:5, put them into a tube furnace and sinter at 800° C. for 3 hours under a nitrogen or argon atmosphere to obtain nitrogen-doped graphene;

[0058] (2) SiO 2 Mix it with nitrogen-doped graphene at a mass ratio of 1:9 and put it into a certain container, pour N-methylpyrrolidone into the mixture as a solvent, and perform magnetic stirring at a speed of 300rpm. After stirring for 2 hours, place the container in a nanomaterial dispersion In the device, ultrasonic 2h, ultrasonic power is 300W, the slurry after ultrasonic is washed with deionized water for many times, put into the drying oven at 80 ℃ and dried for 20h to obtain SiO 2 / Nitrogen-doped graphene composite material;

[0059] (3) Pour ethylene glycol into the container, add 2 times of SnCl ...

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Abstract

The invention discloses a preparation method and application of a graphene-based composite electrode material. The preparation method comprises the following steps: firstly, adding SiO2 into graphene, and carrying out ultrasonic dispersion to obtain a SiO2 / graphene-based composite material; then adding the mixture into an organic solvent containing divalent tin salt for ultrasonic dispersion, and finally adding a reducing agent for ultrasonic dispersion, wherein on one hand, the reducing agent can reduce the graphene oxide and can also react with the divalent tin salt and the organic solvent to generate a Sn simple substance, the silicon / tin doped graphene-based composite material is obtained, the doped substances have very high theoretical specific capacity, and the capacity performance of the composite material can be remarkably improved. The doped substance is uniformly dispersed on the graphene with a large specific surface area through ultrasound, the material is helped to form a stable and uniform SEI film in the battery cycle process, so that the cycle stability is improved; meanwhile, the graphene can effectively inhibit the volume expansion effect of the metal substance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method and application of a graphene-based composite electrode material. Background technique [0002] With the emergence of the emerging market of electric vehicles, there is a huge demand for lithium-ion batteries (LIB). At present, the commercial negative electrode materials are mainly graphite carbon-based carbon materials. Although graphite is a common negative electrode for commercial lithium-ion batteries, But because of its low specific capacity (372mAh g -1 ), serious safety issues and the formation of SEI membranes (solid electrolyte membranes) limit its further development. Therefore, a variety of alternative anode materials with high theoretical specific capacity have been proposed, such as SiO 2 (1965mAh g -1 ), Sn (993mAh g -1 ) and SnO 2 (1494mAh g -1 )Wait. However, these materials suffer from drastic volume changes d...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/587H01M4/62H01M10/0525
CPCH01M4/587H01M4/625H01M4/483H01M10/0525H01M2004/027Y02E60/10H01M4/485
Inventor 张振华李长东范霞毛林林阮丁山
Owner GUANGDONG BRUNP RECYCLING TECH
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