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Rod-shaped nano iron oxide electrode material, and preparation method and application thereof

A nano iron oxide, electrode material technology, applied in iron oxide, iron oxide/iron hydroxide, battery electrodes, etc., can solve the problems of high energy consumption, contain other impurities, low material purity, etc., and achieve easy large-scale industrialization The effect of uniform production, size comparison, and simple preparation process

Inactive Publication Date: 2014-02-26
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the mechanical ball milling method is simple, it has the following defects: the obtained material has low purity and contains other impurities, and the prepared material is generally granular and the particle distribution is uneven
[0005] In the existing methods for synthesizing nanometer iron oxide by hydrothermal reaction, there are generally following defects: the acquisition of raw materials is not easy, for example, ferric chloride hexahydrate is added to nanocellulose in the patent application whose publication number is CN102674472A, the nanometer Cellulose also needs to be prepared using a special method, so the acquisition of raw materials is more complicated; the raw materials contain toxic organic components, pollute the environment, etc.
[0006] The method of preparing nano-iron oxide with FeOOH nanorods as a precursor generally needs to add alkali, which pollutes the environment. In addition, the obtained material must be annealed at about 600 degrees, the process is long, the operation steps are cumbersome, and the efficiency is low. high energy consumption

Method used

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  • Rod-shaped nano iron oxide electrode material, and preparation method and application thereof
  • Rod-shaped nano iron oxide electrode material, and preparation method and application thereof
  • Rod-shaped nano iron oxide electrode material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Preparation of rod-shaped nano-iron oxide powder:

[0044] Weigh ferric chloride hexahydrate (FeCl 3 ·6H 2 O) 0.972g, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 0.01485g (the molar ratio of ferric chloride hexahydrate to ammonium dihydrogen phosphate is 26:1) and 160g of deionized water, all of which are put into the hydrothermal reaction kettle, and the hydrothermal reaction time is 2h under the condition of 220°C , and then cooled naturally to room temperature. The precipitate was then washed three times with deionized water and twice with ethanol. After separation, the rod-shaped nano-iron oxide powder was obtained, and the HPLC detection purity was 99.9%.

[0045] From figure 1 and figure 2 It can be seen from the figure that the obtained nanomaterials are uniform in size and rod-shaped, with an average diameter of about 60-80 nanometers and a length of about 250-300 nanometers. From image 3 and Figure 4 It can be confirmed that the product is α-Fe ...

Embodiment 2

[0051] Preparation of rod-shaped nano-iron oxide powder:

[0052] Weigh ferric chloride hexahydrate (FeCl 3 ·6H 2 O) 0.695g, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 0.01g (the molar ratio of ferric chloride hexahydrate to ammonium dihydrogen phosphate is 30:1) and 120g of deionized water, all of which are put into the hydrothermal reaction kettle, and the hydrothermal reaction time is 2h under the condition of 220°C , and then cooled naturally to room temperature. The precipitate was then washed three times with deionized water and twice with ethanol. After separation, the rod-shaped nano-iron oxide powder was obtained, and the HPLC detection purity was 99.9%.

[0053] According to low-magnification SEM analysis, the obtained nanomaterials are uniform in size and rod-shaped, with a diameter of about 60-80 nanometers and a length of about 250-300 nanometers. The XRD analysis can confirm that the product is α-Fe 2 o 3 Phase, obvious α-Fe can be observed at 33゜, 35...

Embodiment 3

[0058] Preparation of rod-shaped nano-iron oxide powder: Except that the hydrothermal reaction condition is 205° C. and the reaction time is 8 h, the preparation method of the rod-shaped nano-iron oxide powder in Example 1 is the same.

[0059] According to low-magnification SEM analysis, the obtained nanomaterials are uniform in size and rod-shaped, with a diameter of about 60-80 nanometers and a length of about 250-300 nanometers. The XRD analysis can confirm that the product is α-Fe 2 o 3 Phase, obvious α-Fe can be observed at 33.1゜, 35.6゜, 53.8゜ 2 o 3 Characteristic peaks.

[0060] Preparation of battery positive and negative electrode sheets with the above-mentioned electrode active materials: same as in Example 1.

[0061] The negative electrode sheet prepared in this example, the lithium sheet as the positive electrode sheet, PE (polyethylene) as the diaphragm, LiPF 6 1mol / l DMC:EC:EMC=1:1:1 is the electrolyte to assemble the button battery 3-A. Constant current c...

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Abstract

The invention discloses a rod-shaped nano iron oxide electrode material, and a preparation method thereof. The preparation method comprises the steps of carrying out a hydrothermal reaction by using FeCl3.6H2O, ammonium dihydrogen phosphate and water as raw materials; and washing produced precipitate to obtain the rod-shaped nano iron oxide. The nano iron oxide is in a rod shape, with an average diameter being 60-80 nm, length being 250-300 nanometers, purity higher than 99.9% and crystal phase being alpha-Fe2O3. The rod-shaped nano iron oxide electrode material can be used as both a positive electrode active material and a negative electrode active material for a lithium ion battery. Raw materials used in the preparation method are easily available, nontoxic and pollution-free to environment. A preparation process is simple; operation is convenient; and the preparation method is suitable for large-scale production. By using the rod-shaped nano iron oxide electrode material as the positive and negative electrode active materials for the lithium ion battery, cost is low; electrochemical performance is excellent; chemical stability of the electrode material is stable; specific capacity is high; and polarization of a charge and discharge platform is small.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion battery electrode materials, in particular to a rod-shaped nano-iron oxide electrode material and its preparation method and application. The rod-shaped nano-iron oxide has regular appearance, uniform size and high purity, and can be used as positive and negative electrode material. Background technique [0002] As a new type of high-energy storage battery, lithium-ion batteries have the advantages of high energy density, long service life, good cycle performance and no memory effect. They are widely used in mobile electronic products such as mobile phones, notebook computers, digital cameras, etc. In recent years, lithium-ion batteries have been used in electric vehicles, electric tools, smart grids, distributed energy systems, aerospace, national defense and other fields, becoming one of the most valuable energy storage devices in the 21st century. [0003] Iron oxide nanomat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/131B82Y30/00
CPCY02E60/122B82Y30/00C01G49/06H01M4/52C01G49/02C01P2002/72C01P2004/03C01P2004/16C01P2006/40H01M4/131H01M4/1391H01M4/523H01M10/052Y02E60/10
Inventor 曾宏武英戚雯况春江周少雄
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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