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A composite iron carbodiimide battery negative electrode material and preparation method thereof

A technology for iron carbodiimide batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of improving conductivity and structural stability, enhancing reactivity, and easily obtaining raw materials

Active Publication Date: 2021-10-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can effectively coat the carbon on the surface of the product through confinement preparation, and then combine with carbon materials to effectively solve the problem of volume expansion of transition metal carbodiimide and enhance its conductivity, which enhances the reactivity of the battery and makes the battery The structure is more stable, thereby improving the rate and cycle performance of the battery

Method used

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  • A composite iron carbodiimide battery negative electrode material and preparation method thereof
  • A composite iron carbodiimide battery negative electrode material and preparation method thereof
  • A composite iron carbodiimide battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Put 1g of ferric citrate and 1.5g of glucose into a mortar, mix and grind thoroughly, add 60mL of ethanol to the mixture A, put it into the reaction kettle and heat up to 200℃ at 10℃ / min in the homogeneous reactor After 24 hours, the obtained product was collected and centrifuged, centrifuged 4 times for 6 min each time, and the centrifuged product was dried at 60° C. to obtain process product B.

[0035]2) Mix 0.5g of process product B and 1g of urea in an alumina crucible, place the crucible in a tube furnace, and raise the temperature to 500°C at a constant rate of 10°C / min under an argon atmosphere. Solid phase reaction, after the reaction is completed, the reaction product FeNCN@C is collected after the entire reaction system is cooled.

[0036] The product is analyzed by a Japanese Rigaku D / max2000PCX-ray diffractometer, and the XRD pattern of the reaction product FeNCN@C prepared in this example is as follows figure 1 The scanning electron microscope images o...

Embodiment 2

[0039] 1) Put 1g of ferric nitrate into a mortar, mix and grind it thoroughly with 2g of ammonium oxalate, add 60mL of ethanol to the mixture A, put it into the reaction kettle and raise the temperature to 200°C at 10°C / min in the homogeneous reactor for 12h , the obtained product was collected and centrifuged, centrifuged 4 times, each centrifuged for 6 min, and the centrifuged product was dried at 60° C. to obtain process product B.

[0040] 2) Mix 0.5g of process product B and 1.5g of urea into an alumina crucible, place the crucible in a tube furnace, and raise the temperature to 570°C at a constant rate of 20°C / min under an argon atmosphere. Carry out solid-state reaction, after the reaction is completed, the reaction product FeNCN@C is collected after the entire reaction system is cooled.

[0041] Adopt Japanese science D / max2000PCX-ray diffractometer to analyze product D, the XRD of gained product sees Figure 6 , the sample was observed under the scanning electron mic...

Embodiment 3

[0043] 1) Put 1g of ferric oxalate and 1g of sucrose into a mortar, mix and grind thoroughly, add 50mL of ethanol to the mixture A, put it into the reaction kettle, and raise the temperature to 200°C at 10°C / min in the homogeneous reactor for 36h. The obtained product was collected and centrifuged for 3 times, each centrifuged for 8 min, and the centrifuged product was dried at 65° C. to obtain process product B.

[0044] 2) Mix 1g of process product B and 3g of urea in an alumina crucible, place the crucible in a tube furnace, and raise the temperature to 300°C at a constant rate of 10°C / min under an argon atmosphere. After the reaction, the reaction product FeNCN@C was collected after the entire reaction system was cooled.

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Abstract

The invention discloses a negative electrode material for a composite iron carbodiimide battery and a preparation method thereof. In the method, the iron source and the carbon source are first used to limit the energy by solvothermal method, so that the carbon energy can be effectively coated on the surface of the iron salt. , and then convert the iron salt into FeNCN through a solid-state reaction, thereby obtaining a carbon-composite iron carbodiimide material; the carbon-composite iron carbodiimide battery negative electrode material prepared by this method is composed of iron carbodiimide and carbon layer Composition, because iron carbodiimide is coated with a carbon layer on the outside, so that during the use of the sodium ion battery, iron carbodiimide is limited by the carbon layer and it is difficult to produce a large volume change, which effectively solves the problem of transition metal carbon The volume expansion of diimine improves the conductivity and structural stability of the material during charge and discharge, and enhances the reactivity of the battery, making the material have excellent sodium ion storage performance, high charge and discharge capacity and good rate performance. .

Description

【Technical field】 [0001] The invention belongs to the field of composite material synthesis, and in particular relates to a composite iron carbodiimide battery negative electrode material and a preparation method thereof. 【Background technique】 [0002] Lithium-ion batteries are currently commonly used batteries, but the reserves of lithium resources in the earth are relatively low, and the high price has become a bottleneck for the continued development of lithium-ion batteries. Because there is an urgent need to find an element with abundant reserves and similar properties to replace lithium. Sodium and lithium are elements of the same main group, and sodium reserves are relatively high on the earth and widely distributed. Due to the advantages of high energy density, long service life, and environmental friendliness, sodium-ion batteries have become a research hotspot in recent years and have been successfully commercialized. In recent years, a large number of scientifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCY02E60/10
Inventor 李嘉胤田欣郭鹏辉黄剑锋王蓉胡郁竹石梁孟云
Owner SHAANXI UNIV OF SCI & TECH
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