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A kind of preparation method of iron-based-carbon composite material with core-shell structure

A core-shell structure, iron-based technology, used in structural parts, electrical components, battery electrodes, etc., can solve problems such as capacity fading, and achieve the effects of improving electrical conductivity, controllable process, and improving specific capacity and rate performance.

Active Publication Date: 2021-05-25
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Anode materials with iron ions in various valence states as ligands are widely used, such as iron metal oxides, iron disulfide, etc., but their capacity decays significantly with charge and discharge.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] A method for preparing an iron-based-carbon composite material with a one-layer core-shell structure comprises:

[0025] 1) Weigh a certain mass of soluble iron salt, trisodium citrate, and ethanol / water mixture and mix them, and conduct a hydrothermal reaction at 160°C for 10 hours; wherein, the volume ratio of ethanol / water is 80;

[0026] 2) Disperse the product of step 1 in an alcoholic solvent, add water and tetraethyl silicate, and stir at 40°C for 5 hours; filter and wash; wherein, the molar ratio of iron to silicon is 5;

[0027] 3) Put the product of step 2 into cetyltrimethylamine bromide, water, phenolic compounds, absolute ethanol, ammonia water, and aldehyde compounds in sequence, and stir at 50°C for 5 hours; filter and wash;

[0028] 4) with step 3 product in N 2 Carbonization at 600°C for 5 hours under atmosphere;

[0029] 5) Put the product of step 4 into a strong alkali solution for 10 hours; wash and dry;

[0030] 6) Mix the product of step 5 with ...

example 2

[0036] A method for preparing an iron-based-carbon composite material with a two-layer core-shell structure comprises:

[0037] 1) Weigh a certain mass of soluble iron salt, trisodium citrate, and ethanol / water mixture and mix them, and conduct a hydrothermal reaction at 180°C for 5 hours; wherein, the volume ratio of ethanol / water is 90;

[0038] 2) Disperse the product of step 1 in an alcoholic solvent, add water and tetraethyl silicate, and stir at 40°C for 5 hours; filter and wash; wherein, the molar ratio of iron to silicon is 4;

[0039] 3) Put the product of step 2 into cetyltrimethylamine bromide, water, phenolic compounds, absolute ethanol, ammonia water, and aldehyde compounds in sequence, and stir at 50°C for 5 hours; filter and wash;

[0040] 4) with step 3 product in N 2 Carbonization at 500°C for 10h under atmosphere;

[0041] 5) Repeat the cycle of steps 1, 2, 3, and 4 for the product of step 4 once;

[0042] 6) Put the product of step 5) into a strong alkali...

example 3

[0051] A method for preparing an iron-based-carbon composite material with a three-layer core-shell structure comprises:

[0052] 1) Weigh a certain mass of soluble iron salt, trisodium citrate, and ethanol / water mixture and mix them, and conduct a hydrothermal reaction at 200°C for 4 hours; wherein, the volume ratio of ethanol / water is 85;

[0053] 2) Disperse the product of step 1 in an alcoholic solvent, add water and tetraethyl silicate, and stir at 40°C for 5 hours; filter and wash; wherein the molar ratio of iron to silicon is 2;

[0054] 3) Put the product of step 2 into cetyltrimethylamine bromide, water, phenolic compounds, absolute ethanol, ammonia water, and aldehyde compounds in sequence, and stir at 50°C for 5 hours; filter and wash;

[0055] 4) with step 3 product in N2 Carbonization at 600°C for 5 hours under atmosphere;

[0056] 5) Repeat the cycle of steps 1, 2, 3, and 4 for the product of step 4 for 2 times;

[0057] 6) Put the product of step 5) into a str...

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PUM

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Abstract

The invention discloses a method for preparing an iron-based-carbon composite material with a core-shell structure, which uses soluble iron salt as a raw material, undergoes thermal reaction of iron salt water, hydrolysis of tetraethyl silicate, polymer coating, and repeats the cycle of 0- 3 times, strong alkali treatment, carbonization, and finally reaction with iodine to obtain an iron-based-carbon composite material with a core-shell structure; the iron-based-carbon composite material is a micro-nano structure, containing 1-4 layers of core-shell structure; the iron-based ‑Carbon composites have good electrochemical properties and have good application prospects in the field of batteries.

Description

technical field [0001] The patent of the present invention relates to a preparation method of an electrode material, in particular to a preparation method of an iron-based-carbon composite material with a core-shell structure. Background technique [0002] The core-shell material has a double-layer or multi-layer structure, and its interior and exterior are enriched with different components, so that the functions of the core and shell can be combined and complemented, so that new functional materials that are different from the properties of the core or shell can be prepared. Designing and constructing nanocomposites with core-shell structure is the frontier of materials science in recent years. Core-shell structure materials can realize the composite and complementary functions of core and shell. In recent years, the design concept of core-shell structure has also been introduced into lithium-ion battery materials. Anode materials with various valence iron ions as ligands...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/58H01M4/582H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 高敏孙磊邹文珍张林浩梁攀飞曹江行范美强
Owner CHINA JILIANG UNIV
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