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A kind of preparation method of copper ferrite superfine powder of high-performance lithium-ion battery anode material

A technology for lithium ion batteries and negative electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of difficult control of reaction temperature, complicated operation steps, poor cycle performance, etc., and achieves flexible control of particle size and cheap and easy raw materials. high specific capacity

Inactive Publication Date: 2014-10-29
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN200710044111.2 provides a method for preparing nano-copper ferrite by self-propagating combustion method, but its actual reaction temperature is difficult to control, and the grain size distribution is wide, which limits its application to a certain extent; CN200810116825.4 discloses A method that combines sol-gel and vacuum freeze-drying (VFD) to prepare nano-catalyst copper ferrite, the method is relatively cumbersome to operate and some conditions are difficult to control, and the prepared copper ferrite has a small particle size , has a good application in the field of catalysis, but because the particle size is too small, its surface energy is high, and it is easy to agglomerate, and it is easy to have side reactions with the electrolyte when used in the field of lithium-ion batteries, so its cycle performance is poor

Method used

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  • A kind of preparation method of copper ferrite superfine powder of high-performance lithium-ion battery anode material
  • A kind of preparation method of copper ferrite superfine powder of high-performance lithium-ion battery anode material
  • A kind of preparation method of copper ferrite superfine powder of high-performance lithium-ion battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. Cubic phase CuFe 2 o 4 (c-CuFe 2 o 4 ) Preparation of ultrafine powder

[0041] Take 1.8g ferrous oxalate hydrate (FeC 2 o 4 2H 2 O) and 1.0 g copper acetate hydrate (Cu(CH 3 COO) 2 ·H 2 O) Put it into a container and add 3ml of ethanol, mix and stir evenly; take out the mixed material and transfer it to a corundum crucible, put it into a tube furnace after the ethanol volatilizes, and sinter at 400°C for 6 hours under an argon atmosphere Cubic phase CuFe 2 o 4 Ultrafine powder.

[0042] 2. Cubic phase CuFe 2 o 4 Phase Analysis of Ultrafine Powder

[0043] Cu Kα rays (wavelength Scanning step rate is 0.08° / sec) for cubic phase CuFe 2 o 4 Ultrafine powder crop phase analysis, the results are as follows figure 1 shown by figure 1 It can be seen that the main component in the X-ray diffraction spectrum is the face-centered cubic phase CuFe 2 o 4 , which matches the JCPDS card standard value (JCPDS, No.25-0283), and no other impurity peaks appear; t...

Embodiment 2

[0051] 1. Tetragonal phase CuFe 2 o 4 (t-CuFe 2 o 4 ) Preparation of ultrafine powder

[0052] Take 1.8g ferrous oxalate hydrate (FeC 2 o 4 2H 2 O) and 1.0 g copper acetate hydrate (Cu(CH 3 COO) 2 ·H 2 O) Put it into a container and add 3ml of ethanol, mix and stir evenly, take out the mixed material and transfer it to a corundum crucible, put it into a tube furnace after the ethanol volatilizes, and sinter at 800°C for 6 hours in an air atmosphere to obtain Tetragonal CuFe 2 o 4 Ultrafine powder.

[0053] 2. Tetragonal phase CuFe 2 o 4 Phase Analysis of Ultrafine Powder

[0054] Using Bruker D8ADVANCE X-ray powder diffractometer to Cu Kα rays (wavelength The scanning step is 0.08° / sec) for tetragonal CuFe 2 o 4 Ultrafine powder crop phase analysis, the results are as follows Image 6 shown by Image 6 It can be seen that the main component in the X-ray diffraction spectrum is tetragonal phase CuFe 2 o 4 (t-CuFe 2 o 4 ), which matches the JCPDS card sta...

Embodiment 3

[0060] Example 3: Cubic Phase CuFe 2 o 4 (c-CuFe 2 o 4 ) Preparation of ultrafine powder

[0061] Get 2.78g ferrous sulfate hydrate (Fe 2 SO 4 ·7H 2 O) and 1.0 g copper acetate hydrate (Cu(CH 3 COO) 2 ·H 2 O) Put it into a container and add 3ml of ethanol, mix and stir evenly; take out the mixed material and transfer it to a corundum crucible, put it into a tube furnace after the ethanol volatilizes, and sinter at 400°C for 6 hours under an argon atmosphere Cubic phase CuFe 2 o 4 Ultrafine powder.

[0062] The obtained ultrafine powder is pure cubic phase CuFe 2 o 4 , good crystallinity; composed of nanoparticles with an average particle size of 100-300nm.

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Abstract

The invention discloses a preparation method of high-performance copper ferrite ultrafine powder for lithium ion battery cathode materials and belongs to the technical field of electrochemistry and new energy materials. The preparation method includes: placing an iron source and a copper source into a container according to the molar ratio of (1.5-3):1, and adding cosolvents with uniform stirring and mixing; and drying and sintering for 4-8 hours at the temperature of 300-850 DEG C in a specific atmosphere, so that the high-performance copper ferrite ultrafine powder is obtained. The CuFe2O4 ultrafine powder prepared by the preparation method is monocrystal powder, has the electrochemical advantages of narrow particle size distribution, high specific capacity, good cycle performance, excellent rate capability and the like and is wide in application prospect. The preparation method is cheap and available in raw material, capable of obtaining pure-phase products by one-step sintering, free of subsequent processing and easy for industrial production.

Description

Technical field: [0001] The invention relates to a preparation method of copper ferrite single crystal ultrafine powder, which is a negative electrode material of a lithium ion battery, and belongs to the technical field of electrochemistry and new energy materials. Background technique: [0002] Lithium-ion battery, as the most studied portable chemical energy source, has been widely used in people's daily life; it has the advantages of high output voltage, stable discharge voltage and long working life. However, with the increasing development of science and technology, especially the rapid development of the miniaturization and miniaturization of today's electronic equipment, people have put forward higher requirements for the power density and energy density of lithium-ion batteries. The anode material of current commercial lithium-ion battery is mainly graphitized carbon material, and its theoretical specific capacity is only 372mAh / g; is of great significance. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/52
CPCY02E60/10
Inventor 钱逸泰邢政鞠治成杨剑马小健
Owner SHANDONG UNIV