Carbon-coated Fe2O3/hard carbon composite material and preparation method thereof

A composite material and carbon-coated technology, applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of limiting the use of hard carbon materials, low reversible capacity of batteries, low discharge voltage, etc., and achieve stable performance, improved sodium storage capacity, and reduced heat release

Pending Publication Date: 2021-10-15
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when hard carbon materials are used as negative electrode materials for batteries, batteries often have shortcomings such as low reversible capacity, low initial efficiency, and low discharge voltage, which limit the use of hard carbon materials.

Method used

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  • Carbon-coated Fe2O3/hard carbon composite material and preparation method thereof
  • Carbon-coated Fe2O3/hard carbon composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) washing the leaves with water, drying and pulverizing to obtain leaf particles;

[0051] (2) the leaf particles in the step (1) are placed in the iron salt solution and warmed up to 50°C for soaking, wherein the negative ion of the iron salt is citrate, the concentration of the iron salt solution is 2.5mol / L, and includes 1% ethanol, 0.1% magnesium carbonate and 1% silicone resin, the weight ratio of leaf particles to iron salt solution is 0.2:1, soak for 4 hours to filter out the leaf particles, then dry, calcinate and pulverize, and the calcining is divided into three stages, stage I: calcining Temperature 350°C, calcination time 40min, stage II: calcination temperature 420°C, calcination time 60min, stage III: calcination time 480°C, calcination time 100min;

[0052] (3) the above Fe 2 o 3 / The hard carbon material is added to the organic carbon source solution and mixed to obtain a slurry, wherein the concentration of the organic carbon source solution is 1.5m...

Embodiment 2

[0055] (1) same as embodiment 1;

[0056] (2) the leaf particle in step (1) is placed in iron salt solution and is warmed up to 50 ℃ and soaks, wherein the negative ion of iron salt is citrate, and the concentration of iron salt solution is 2.5mol / L, and the concentration of leaf particle and iron salt solution The weight ratio is 0.2:1, after soaking for 4 hours to filter out the leaf particles, drying, calcining and crushing, the calcining is divided into three stages, stage I: calcining temperature 350°C, calcining time 40min, stage II: calcining temperature 420°C, calcining time 60min, Stage Ⅲ: calcination time 480℃, calcination time 100min;

[0057] (3) same as embodiment 1;

[0058] That is, the composite material 2# is obtained.

Embodiment 3

[0060] (1) same as embodiment 1;

[0061] (2) the leaf particles in step (1) are placed in the iron salt solution and warmed up to 50°C for soaking, wherein the negative ion of the iron salt is citrate, the concentration of the iron salt solution is 0.5mol / L, and includes 1% ethanol, 0.1% magnesium carbonate and 1% silicone resin, the weight ratio of leaf particles to iron salt solution is 0.5:1, soak for 4 hours to filter out the leaf particles, then dry, calcinate and pulverize, the calcining is divided into three stages, stage I: calcining Temperature 350°C, calcination time 40min, stage II: calcination temperature 420°C, calcination time 60min, stage III: calcination time 480°C, calcination time 100min;

[0062] (3) same as embodiment 1;

[0063] The composite material 3# is obtained.

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Abstract

The invention discloses a preparation method of a carbon-coated Fe2O3 / hard carbon composite material, and belongs to the technical field of sodium ion batteries. The method comprises the following steps: S1, washing leaves with water, drying and crushing to obtain leaf particles; S2, soaking the leaf particles in a ferric salt solution, filtering out the leaf particles, drying, calcining and crushing to obtain a Fe2O3 / hard carbon material, the particle size of the Fe2O3 / hard carbon material being 10-15 [mu]m, the porosity being 30%-35%, and the aperture being 500 nm-1 [mu]m; and S3, adding the Fe2O3 / hard carbon material into an organic carbon source liquid to be mixed to obtain slurry, drying, sintering and smashing the slurry to obtain the carbon-coated Fe2O3 / hard carbon composite material, the particle size of the carbon-coated Fe2O3 / hard carbon composite material is 10.5-15.5 [mu]m, the porosity is 25-30%, and the pore diameter is 30-200 nm.

Description

technical field [0001] This application relates to a carbon-coated Fe 2 o 3 A hard carbon composite material and a preparation method thereof belong to the technical field of sodium ion batteries. Background technique [0002] In recent years, the production and sales of new energy vehicles in China have continued to grow, ranking first in the world. However, traditional lead-acid batteries and nickel-cadmium batteries have low energy efficiency and serious pollution, and lithium-ion batteries have high cost and need to be improved in safety. With the surge in demand for new energy vehicles, it is difficult to meet market demand. Due to the advantages of high safety, low cost, and environmental friendliness, sodium-ion batteries are favored by researchers, which promotes the application of sodium-ion batteries in power batteries. [0003] Hard carbon materials are non-graphitizable amorphous carbon materials with short-range order and long-range disorder. They can be desc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/587H01M4/62H01M10/054
CPCH01M4/523H01M4/587H01M4/625H01M4/628H01M10/054H01M2004/027Y02E60/10
Inventor 时爽二陈慧龙戚昌伟张立君王瑛
Owner SHANDONG YUHUANG NEW ENERGY TECH
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