Carbon coated layer thickness adjustable nanometer ferroferric oxide composite material, preparation method and application thereof

A technology of triiron tetroxide and composite materials, applied in the field of electrochemical materials, can solve problems such as volume expansion, and achieve the effects of inhibiting agglomeration, easy industrial production, and short reaction time

Inactive Publication Date: 2019-09-06
HENAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention proposes a nanometer iron ferric oxide composite material with adjustable coating carbon layer thickness and its preparation method and application, which solves the problem of lithium ion battery negative electrode material Fe 3 o 4 The technical problem of volume expansion encountered in

Method used

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  • Carbon coated layer thickness adjustable nanometer ferroferric oxide composite material, preparation method and application thereof
  • Carbon coated layer thickness adjustable nanometer ferroferric oxide composite material, preparation method and application thereof
  • Carbon coated layer thickness adjustable nanometer ferroferric oxide composite material, preparation method and application thereof

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Embodiment 1

[0033] The preparation method of the nano-iron tetroxide composite material with adjustable coating carbon layer thickness of the present embodiment, the steps are as follows:

[0034] 1. Preparation of the precursor glucose-iron complex

[0035] Glucose and trisodium citrate were dissolved in 40 mL of water, and a certain amount of FeCl was added after stirring to dissolve. 3 solution (dissolved in 0.1 mol / L HCl), adjust the pH to 9.5 with 3 mol / L sodium hydroxide, and react at 70 °C for 6 h; in the reaction solution, glucose, trisodium citrate, Fe 3+ The ratio of the substances is 1:1:2; after the reaction, add 4 times the amount of anhydrous ethanol, wash the precipitate with 80% ethanol three times, and dry at 50 °C, which is the glucose-citric acid-iron complex, named as GCFe.

[0036] 2. Fe with carbon-coated structure 3 O 4 Preparation of composite materials

[0037] The obtained precursor GCFe was placed in air, pre-calcined at 200 °C for 3 h, then placed in a tub...

Embodiment 2

[0039] The preparation method of the nano-iron tetroxide composite material with adjustable coating carbon layer thickness of the present embodiment, the steps are as follows:

[0040] 1. Preparation of the precursor Huaiyam polysaccharide-iron complex

[0041] Huai yam polysaccharide and trisodium citrate were dissolved in 40 mL of water, and a certain amount of FeCl was added after stirring to dissolve. 3 solution (dissolved in 0.1 mol / L HCl), adjusted to pH 9.0 with 3 mol / L sodium hydroxide, and reacted at 65 °C for 6 h; trisodium citrate, Fe in the reaction solution 3+ The mass ratio of the substances is 1:3; the mass ratio of Huaiyam polysaccharide and trisodium citrate is 1:1.5. After the reaction, 4 times the amount of anhydrous ethanol was added, the precipitate was washed three times with 80% ethanol, and dried at 50°C to obtain the Huaiyam polysaccharide-citric acid-iron complex, named as HSYFe.

[0042] 2. Fe with carbon-coated structure 3 O 4 Preparation of com...

Embodiment 3

[0045] The preparation method of the nano-iron tetroxide composite material with adjustable coating carbon layer thickness of the present embodiment, the steps are as follows:

[0046] 1. Preparation of the precursor glucose-iron complex

[0047] Glucose and trisodium citrate were dissolved in 40 mL of water, and a certain amount of FeCl was added after stirring to dissolve. 3 solution (dissolved in 0.1mol / L HCl) and a small amount of potassium phosphate, adjust the pH to 9.3 with 3 mol / L ammonia water, and react at 70°C for 10h; in the reaction solution, glucose, trisodium citrate, Fe 3+ , the substance ratio of potassium phosphate is 1:0.1:3:2. After the reaction, 4 times the amount of anhydrous ethanol was added, the precipitate was washed three times with 80% ethanol, and dried at 50 °C, which was a nitrogen-phosphorus doped glucose-citric acid-iron complex, named GC-NP-Fe.

[0048] 2. Fe with carbon-coated structure 3 O 4 Preparation of composite materials

[0049] T...

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Abstract

The invention relates to the field of electrochemical materials, in particular to a carbon coated layer thickness adjustable nanometer ferroferric oxide composite material, a preparation method and application thereof. The preparation method comprises the following steps: firstly, taking sugar, a catalyst and a ferric salt solution as raw materials, reacting for 0.1 to 24 h under the conditions that the pH is 5 to 10 and the temperature is 5 to 90 DEG C, preparing an iron-sugar complex, and thus preparing the carbon coated layer thickness adjustable nanometer ferroferric oxide composite material from the iron-sugar complex through in situ calcinations or a hydrothermal method. The nanometer ferroferric oxide composite material with a carbon coated layer is prepared through different in situ calcinations conditions or the hydrothermal method by using the iron-sugar complex as a precursor, and due to the fact that a multi-stage carbon structure array can play the role of a fixed frame for ferroferric oxide, the volume effect in the charge and discharge cycle process is reduced, and when the composite material serves as the negative electrode of a battery, the performance of the battery can be improved obviously. The thickness of the carbon coated layer inside the carbon coated ferroferric oxide composite material can be changed by changing the additive amounts of sugar and the catalyst.

Description

technical field [0001] The invention relates to the field of electrochemical materials, in particular to a nano ferric oxide composite material with adjustable thickness of coated carbon layer and its preparation method and application. Background technique [0002] With the rapid development of science and technology, various electronic products and equipment such as electric vehicles, portable computers, and smart phones have been closely connected with people's daily life, and improving the battery performance of these products has become one of the key topics of research all over the world. In the current energy storage system, lithium-ion batteries have attracted much attention due to their safety, small size, long life, large capacity, environmental protection, and wide operating temperature range. Lithium-ion batteries often use petroleum coke and graphite as negative electrode materials, which are safe, non-toxic, abundant in resources and low in cost. However, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/587H01M4/62H01M10/0525B82Y30/00B82Y40/00A61K47/02A61K47/04
CPCA61K47/02B82Y30/00B82Y40/00H01M4/366H01M4/523H01M4/587H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 刘绣华张昀马凡怡
Owner HENAN UNIVERSITY
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