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Preparation method of cobalt-manganese composite oxide nanoparticles and cobalt-manganese composite oxide nanoparticles prepared by adopting same

A composite oxide and nanoparticle technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc. Complex problems, to achieve the effect of large-scale promotion and application, easy shape and structure, and low equipment requirements

Inactive Publication Date: 2012-05-02
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0003] The invention provides a method for preparing cobalt-manganese composite oxide nanoparticles and the cobalt-manganese composite oxide nanoparticles prepared by the method, which are used to solve the existing high demand for cobalt-manganese composite oxide preparation methods. Temperature and long reaction time, the shape and structure of particles are not easy to control, the preparation process is complicated, and it is difficult to apply on a large scale

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  • Preparation method of cobalt-manganese composite oxide nanoparticles and cobalt-manganese composite oxide nanoparticles prepared by adopting same
  • Preparation method of cobalt-manganese composite oxide nanoparticles and cobalt-manganese composite oxide nanoparticles prepared by adopting same
  • Preparation method of cobalt-manganese composite oxide nanoparticles and cobalt-manganese composite oxide nanoparticles prepared by adopting same

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preparation example Construction

[0019] This specific embodiment provides a method for preparing cobalt-manganese composite oxide nanoparticles and the cobalt-manganese composite oxide nanoparticles prepared by the method, such as figure 1 Shown, corresponding preparation method comprises:

[0020] Step 1, dissolving a predetermined amount of manganese acetate and polyvinylpyrrolidone in water and ethanol solution to obtain manganese acetate and polyvinylpyrrolidone solution;

[0021] Step 2: Add the potassium cobaltcyanate solution dropwise into the cobalt acetate and polyvinylpyrrolidone solution under predetermined temperature conditions, and let it stand for a predetermined time after magnetic stirring, and obtain cobalt cyanate complex nanoparticles by centrifugation ;

[0022] Step 3, calcining the dried cobalt cyanate complex nanoparticles in the air for a predetermined time at a temperature of 400° C. to obtain cobalt-manganese composite oxide nanoparticles.

[0023] The principle and function of th...

Embodiment 1

[0024] Embodiment 1. prepares uniform manganese cobalt cyanate (Mn 3 [Co(CN) 6 ] 2 )Nanoparticles

[0025] At room temperature, 10mL containing 17mg (0.05mmol) K 3 [Co(CN) 6 ] was added dropwise to 20mL containing 18mg (0.075mmol) cobalt acetate (Co(CH 3 COO) 2 ) and 0.3g of PVP (5mL water, 15mL ethanol), after magnetic stirring, stand still for 24 hours, and centrifuge to obtain manganese cobalt cyanate nanoparticles.

[0026] The composition of the particles can be determined by X-ray diffraction. Such as figure 2 Shown, the X-ray diffraction of the product prepared in this embodiment Figure, all diffraction peak positions correspond respectively to (200), (220), (400), (420), (422), (440), (600), (620), (640) of cobalt cyanate cobalt cyanate respectively The (642) crystal plane shows that the product is manganese cobalt cyanate with good crystallinity. image 3 It is a scanning electron microscope (SEM) photo of the product. It can be seen from the figure that m...

Embodiment 2

[0027] Embodiment 2. prepare cobalt-manganese composite oxide (Co x mn 3-x o 4 )Nanoparticles

[0028] Put 30 mg of manganese cobalt cyanate nanoparticles in a crucible and calcinate at 400° C. for 1 hour to obtain cobalt-manganese composite oxide nanoparticles.

[0029] The chemical composition of the particles can be determined by X-ray diffraction. Such as Figure 5 Shown, the X-ray diffraction of the product obtained in the present embodiment Figure, the positions of all diffraction peaks are the same as those of CoMn 2 o 4 The standard X-ray diffraction patterns correspond to (101), (112), (103), (211), (220), (321), (224), (400) crystal planes respectively, showing that the sample is cobalt manganese composite oxides. No diffraction peaks of manganese cobalt cyanate were found, indicating that all manganese cobalt cyanate was converted into cobalt-manganese composite oxides. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) photograp...

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Abstract

The invention provides a preparation method of cobalt-manganese composite oxide nanoparticles and the application of the cobalt-manganese composite oxide nanoparticles prepared by adopting the method in a lithium ion battery. The corresponding method comprises the steps that a predetermined amount of manganese acetate and polyvinylpyrrolidone are dissolved in water and an ethanol solution, and a manganese acetate and polyvinylpyrrolidone solution is obtained; under a predetermined temperature condition, a cobalt potassium cyanate solution is dropwise added into the manganese acetate and polyvinylpyrrolidone solution, is magnetically stirred and then stands still for predetermined time, and cobalt cyanic acid radical complex nanoparticles are obtained through centrifugal separation; and the dried cobalt cyanic acid radical complex nanoparticles are calcined in air for predetermined time at a calcination temperature of 400 DEG C, and the cobalt-manganese composite oxide nanoparticles are obtained after the calcination. According to the preparation method, higher temperature and longer reaction time are not needed, the shapes and the structures of the particles are easy to control, the manufacturing process is relatively simple, the requirement for equipment is not high, and large-scale popularization and application can be realized.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a method for preparing cobalt-manganese composite oxide nanoparticles and the cobalt-manganese composite oxide nanoparticles prepared by the method. Background technique [0002] Cobalt-manganese composite oxide is a new type of material with a wide range of uses. Because it contains two different metal ions and has a special spinel crystal structure, it is widely used in magnetism, electronics, catalysis, energy conversion and storage, etc. have great application prospects. In the prior art, MnCo has been prepared by heating at 800 °C for 24 hours using the sol-gel method 2 o 4 material, and the material still has 450mAh g after 50 cycles when it is used as a lithium-ion battery anode -1 The capacity shows better performance; in the prior art, CoMn with good electrocatalytic performance can also be synthesized at room temperature by using the liquid phase syn...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525B82Y30/00B82Y40/00
CPCY02E60/122Y02E60/10
Inventor 陈乾旺闫楠胡林
Owner UNIV OF SCI & TECH OF CHINA
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