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Pomegranate-shaped Fe3O4@N-C lithium battery cathode material preparation method thereof

A pomegranate-shaped, lithium battery technology, applied in nanocomposite materials and their application fields, can solve the problems of poor stability of ultra-small particles, restricting development, and difficult to large-scale synthesis.

Inactive Publication Date: 2018-03-27
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ultra-small particles have poor stability, are easy to aggregate, and are difficult to synthesize on a large scale, which seriously restricts their development.

Method used

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  • Pomegranate-shaped Fe3O4@N-C lithium battery cathode material preparation method thereof
  • Pomegranate-shaped Fe3O4@N-C lithium battery cathode material preparation method thereof
  • Pomegranate-shaped Fe3O4@N-C lithium battery cathode material preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Fe 3 o 4 Preparation of @N-C nanoparticle anode material

[0022] Add 40 mg of polyacrylic acid, 100 μL of ammonia water and 20 mL of deionized water into a 100 mL round-bottomed flask in turn, stir and mix evenly, slowly add 80 mL of isopropanol into the solution dropwise, and then add 50 mg ferrous chloride tetrahydrate, stirred at room temperature for 3 h. The above solution was centrifuged, and the precipitate was at 50 o C oven for 8 h. Subsequently, the solid was placed in a tube furnace under the protection of argon for 500 o C calcined for 5 h to obtain pomegranate-like Fe 3 o 4 @N-C high-performance lithium battery anode material.

Embodiment 2

[0023] Example 2 Fe 3 o 4 Preparation of @N-C high-performance lithium battery anode materials

[0024] Add 50 mg of polyacrylic acid, 130 μL of ammonia water and 23 mL of deionized water into a 100 mL round-bottomed flask in turn, stir and mix evenly, slowly add 100 mL of isopropanol into the solution dropwise, and then add 60 mg ferrous chloride tetrahydrate, stirred at room temperature for 4 h. The above solution was centrifuged, and the precipitate was at 50 o C oven for 10 h. Subsequently, the solid was placed in a tube furnace under the protection of argon for 600 o C was calcined for 10 h to obtain pomegranate-like Fe 3 o 4 @N-C high-performance lithium battery anode material.

Embodiment 3

[0025] Example 3 Fe 3 o 4 Preparation of @N-C nanoparticle anode material

[0026] Add 43 mg of polyacrylic acid, 150 μL of ammonia water and 30 mL of deionized water into a 100 mL round-bottomed flask in sequence, stir and mix evenly, slowly add 100 mL of isopropanol into the solution dropwise, and then add 100 mg ferrous chloride tetrahydrate, stirred at room temperature for 5 h. The above solution was centrifuged, and the precipitate was at 50 o C oven for 10 h. Subsequently, the solid was placed in a tube furnace under the protection of argon at 550 o C calcined for 8 h to obtain pomegranate-like Fe 3 o 4 @N-C high-performance lithium battery anode material.

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Abstract

The invention discloses a pomegranate-shaped Fe3O4@N-C nanoparticles, which is characterized in that 40-50 mg of polyacrylic acid, 100-200 [mu]L of ammoniacal liquor and 20-35 [mu]L of deionized waterare added in a container in order, the materials are stirred and uniformly mixed, then 80-120 mL of isopropanol is added in a solution, after dropping is finished, 50-100 mg of iron dichloride tetrahydrate is added in the solution, and the materials are stirred under room temperature for a reaction; centrifugation and precipitation drying are carried out, the materials are calcined at the temperature of 500-600 DEG C under protection of inert gas, and the product is obtained. The nanoparticles are assembled by many ultra small nitrogen-doped carbon-coated ferriferrous oxide secondary units, wherein particle size of the secondary unit is less than 5 nm, a transmission distance of lithium ions is greatly reduced, and the nanoparticles have superhigh cycle stability and multiplying power performance, the nanoparticles can be taken as an active material to prepare the lithium battery, and the experiment shows that the lithium battery has superhigh cycle performance, and rapid charge and discharge capability.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials and their applications, in particular to a pomegranate-like nitrogen-doped carbon-coated iron tetroxide (Fe 3 o 4 @N-C) Preparation method of high-performance lithium battery anode materials. Background technique [0002] transition metal oxide M x o y (M = Fe, Co, Cu, Ni, etc.) as a negative electrode material for lithium-ion batteries began in 2000. The Tarascon research group reported the nanoscale transition metal oxide negative electrode material for the first time, and showed excellent electrochemical performance. At the same time, he also proposed that the lithium storage mechanism of such materials as anode materials for lithium-ion batteries is different from the traditional lithium intercalation mechanism. During discharge, the transition metal oxide M x o y Completely reversible redox reaction with lithium, with high theoretical reversible capacity (500-1000 mAh g ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/583H01M4/62H01M4/1391H01M4/1393H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/1391H01M4/1393H01M4/366H01M4/52H01M4/583H01M4/622H01M4/625H01M10/0525Y02E60/10
Inventor 李鹿王春刚苏忠民谢海明
Owner NORTHEAST NORMAL UNIVERSITY
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