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Core double-shell structure cathode nanometer material for nickel iron battery and preparation method and application thereof

A composite nanomaterial, shell structure technology, applied in battery electrodes, nanotechnology for materials and surface science, negative electrodes, etc. Effects of improved rate discharge performance, improved interface electrochemical properties, and excellent cycle stability

Active Publication Date: 2017-06-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can obtain a coating layer with a double-shell structure, which can effectively solve the problems of easy passivation and poor cycle performance of the negative electrode of the iron electrode in the prior art

Method used

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  • Core double-shell structure cathode nanometer material for nickel iron battery and preparation method and application thereof
  • Core double-shell structure cathode nanometer material for nickel iron battery and preparation method and application thereof
  • Core double-shell structure cathode nanometer material for nickel iron battery and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: (undoped nickel)

[0025] Weigh 3.15g of citric acid and dissolve in 35ml of absolute ethanol solution. Then weigh 2.02g of ferric nitrate and add it to the above solution, stir at room temperature for 30min, then raise the temperature to 40°C for 1h, continue to raise the temperature to 80°C, stir and evaporate to dryness to obtain the precursor powder. Placed in a tube furnace, with a 60cm 3 min -1 Continuous injection of argon protective gas at the flow rate, after half an hour, at 5°C min -1 The heating rate was heated to 600°C for 2h at a constant temperature. Then naturally cooled to room temperature to obtain the target product.

[0026]The negative electrode sheet of the iron electrode was produced by rolling sheet method. The mass ratio of active material, conductive agent acetylene black and binder polytetrafluoroethylene is 8:1:1. First, weigh the active material and acetylene black according to the above ratio. After mixing evenly, trans...

Embodiment 2

[0029] Weigh 3.15g of citric acid and dissolve in 35ml of absolute ethanol solution. Then weigh 2.02g of iron nitrate and 0.15g of nickel nitrate into the above solution, stir at room temperature for 30min, then raise the temperature to 40°C for 1h, continue to raise the temperature to 80°C, stir and evaporate to dryness to obtain the precursor powder. Placed in a tube furnace, with a 60cm 3 min -1 Continuous injection of argon protective gas at the flow rate, after half an hour, at 5°C min -1 The heating rate was heated to 600°C for 2h at a constant temperature. Then naturally cooled to room temperature to obtain the target product.

[0030] The electrode manufacturing process and battery electrochemical performance test are the same as in Example 1. Table 2 records the specific surface area data of the product, and its specific surface area is 51.2m 2 g -1 , slightly larger than that of Example 1 (without adding nickel source). figure 1 The XRD curve of the sample is ...

Embodiment 3

[0032] Weigh 3.15g of citric acid and dissolve in 35ml of absolute ethanol solution. Then weigh 2.02g of ferric nitrate and 0.29g of nickel nitrate and add to the above solution, stir at room temperature for 30min, then raise the temperature to 40°C for 1h, continue to raise the temperature to 80°C, stir and evaporate to dryness to obtain the precursor powder. Placed in a tube furnace, with a 60cm 3 min -1 Continuous injection of argon protective gas at the flow rate, after half an hour, at 5°C min -1 The heating rate was heated to 600°C for 2h at a constant temperature. Then naturally cooled to room temperature to obtain the target product.

[0033] The electrode manufacturing process and battery electrochemical performance test are the same as in Example 1. Record the specific surface area data of gained sample in table 2, its specific surface area is 52.8m 2 g -1 , which is also larger than the samples in Example 1 and Example 2. figure 1 Recorded the XRD pattern of ...

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Abstract

The invention discloses a core double-shell structure (Fe-Ni@Fe3O4@C) cathode nanometer material for a nickel iron battery and a preparation method and application of the core double-shell structure (Fe-Ni@Fe3O4@C) cathode nanometer material. An iron source, a nickel source, and an organic complexing agent are respectively added into an organic solvent to be dissolved, evenly mixed, stirred, heated and evaporated to dryness to obtain a precursor, and then the precursor is sintered at high temperature under the protective atmosphere to obtain the target material. The material is the core double-shell structure Fe-Ni@Fe3O4@C, and is higher in specific area. The Fe-Ni@Fe3O4@C, as the cathode material for the nickel iron battery, is high in specific discharge capacity and excellent in circulatory stability. The preparation method is short in process flow and simple in operation, and the industrial production of the preparation method is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of high-energy battery materials, and in particular relates to a high-performance nickel-iron battery iron electrode negative electrode nano material with a core double shell structure and its preparation method and application. Background technique [0002] The nickel-iron battery is a rechargeable battery with a wide range of uses. In the United States, the former Soviet Union, Sweden, Germany and Japan, nickel-iron batteries are fully used in various aspects. Due to the abundance of iron resources, low cost, environmental protection and no pollution, nickel-iron batteries have attracted extensive attention of researchers in recent years. However, the current research on nickel-iron batteries is not perfect, and there are problems such as low charge and discharge efficiency, serious self-discharge and easy passivation, which seriously restrict the performance of nickel-iron batteries. important path to b...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/52H01M4/62B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/521H01M4/628H01M2004/021H01M2004/027Y02E60/10
Inventor 唐有根李芳芳王海燕彭志光
Owner CENT SOUTH UNIV
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