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Composite iron trifluoride positive electrode material, preparation method and application

A cathode material, iron trifluoride technology, applied in the direction of positive electrode, electrode manufacturing, nanotechnology for materials and surface science, etc., can solve the problems of low lithium ion conductivity, limited rate performance, etc., to achieve a broad conductive network Structure, excellent rate capability, the effect of high rate capability

Inactive Publication Date: 2020-11-03
SIDUS ENERGY TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inherent low lithium ion conductivity and electronic conductivity of ferric fluoride materials largely limit its rate performance.

Method used

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  • Composite iron trifluoride positive electrode material, preparation method and application

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Embodiment 1

[0033] This embodiment discloses a composite ferric trifluoride positive electrode material and its preparation method and application. The preparation method of the positive electrode material includes the following steps:

[0034] Step 1. Disperse 15 mg of carbon nanohorns processed through the opening oxidation process in 15 mL of [Bmim] [BF 4 ] In the ionic liquid, after 10 min of stirring and 5 min of ultrasonic treatment, the carbon nanohorns were uniformly dispersed in the ionic liquid.

[0035] Step 2, then add 100mL absolute ethanol and 1g Fe(NO 3 ) 3 9H 2 O, stirred for 30min to ensure that the reactants were well mixed.

[0036] Step 3, the reaction solution is placed in an oil bath reactor with a constant temperature of 80° C., protected by nitrogen, and continuously stirred for 6 hours to stop the reaction.

[0037] Step 4, dilute the viscous reaction product obtained with acetone, and centrifuge 8 times at a speed of 10000 rpm;

[0038] Step five, freeze the...

Embodiment 2

[0047] This embodiment discloses a composite ferric trifluoride positive electrode material and its preparation method and application. The preparation method of the positive electrode material includes the following steps:

[0048] Step 1. Disperse 10 mg of carbon nanohorns treated by the opening oxidation process in 10 mL of [Bmim] [BF 4] In the ionic liquid, after 15 min of stirring and 8 min of ultrasonic treatment, the carbon nanohorns were uniformly dispersed in the ionic liquid.

[0049] Step 2, then add 50mL absolute ethanol and 1g Fe(NO 3 ) 3 9H 2 O, stirred for 20min to ensure that the reactants were well mixed.

[0050] Step 3, the reaction solution was placed in an oil bath reactor at a constant temperature of 60° C., protected by nitrogen, and stirred continuously for 4 hours to stop the reaction.

[0051] Step 4, dilute the viscous reaction product obtained with acetone, and centrifuge 8 times at a speed of 10000 rpm;

[0052] Step five, freeze the centrifug...

Embodiment 3

[0055] This embodiment discloses a composite ferric trifluoride positive electrode material and its preparation method and application. The preparation method of the positive electrode material includes the following steps:

[0056] Step 1. Disperse 20 mg of carbon nanohorns processed through the opening oxidation process in 20 mL of [Bmim] [BF 4 ] In the ionic liquid, after 20 min of stirring and 8 min of ultrasonic treatment, the carbon nanohorns were uniformly dispersed in the ionic liquid.

[0057] Step 2, then add 200mL absolute ethanol and 1g Fe(NO 3 ) 3 9H 2 O, stirred for 40min to ensure that the reactants were well mixed.

[0058] Step 3, the reaction solution is placed in an oil bath reactor with a constant temperature of 100° C., protected by nitrogen, and continuously stirred for 8 hours to stop the reaction.

[0059] Step 4, dilute the viscous reaction product obtained with acetone, and centrifuge 8 times at a speed of 10000 rpm;

[0060] Step five, freeze th...

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Abstract

The invention discloses a composite iron trifluoride positive electrode material. The composite iron trifluoride positive electrode material is a FeF3.0.33H2O carbon nanohorn composite material synthesized from carbon nanohorns and Fe(NO3)3.9H2O through a liquid-phase synthesis method. The preparation method of the composite material comprises the following steps: dispersing carbon nanohorns subjected to open pore oxidation treatment into ionic liquid, and uniformly dispersing the carbon nanohorns into the ionic liquid through stirring and ultrasonic treatment; then sequentially adding absolute ethyl alcohol and an iron source, and stirring the mixture until reactants are fully and uniformly mixed; putting the reaction solution into a constant-temperature oil bath reactor, carrying out nitrogen protection, and continuously stirring the mixture until the reaction is stopped; diluting the viscous reaction product obtained in the step 3 with acetone, and centrifuging the reaction product;freezing the centrifugal product in the step 4 by using liquid nitrogen, and volatilizing residual acetone to obtain a target product. The invention further discloses application of the composite material to a lithium ion solid-state battery. The material has good conductivity and is suitable for a high-rate system, and the preparation method is simple.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a composite ferric trifluoride positive electrode material, a preparation method and an application. Background technique [0002] As cathode materials for lithium-ion batteries, metal fluorides have always been a very promising class of cathode materials. Fluorine has a high electronegativity, and fluoride and lithium metal can not only perform lithium ion intercalation / extraction reactions, but also undergo reversible chemical conversion reactions with lithium to store energy. [0003] In recent years, as a new cathode material for lithium-ion batteries, ferric fluoride has attracted extensive attention from researchers for its high plateau potential, theoretical capacity as high as 237mAh / g, and low price. The inherent low lithium ion conductivity and electronic conductivity of ferric fluoride materials largely limit their rate performance. Contents of the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M4/1397H01M10/0525H01M4/04B82Y30/00
CPCB82Y30/00H01M4/0497H01M4/1397H01M4/582H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 孙晓玉李炳江王立群郑浪易祖良刘奕凯叶鑫
Owner SIDUS ENERGY TECH LTD
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