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Ferric oxide/manganic oxide hollow porous sphere material, preparation and application thereof

A hollow porous and hollow sphere technology, applied in the field of nanomaterials and electrochemistry, can solve the problems of fast capacity decay and improved cycle life of lithium-ion batteries, and achieve the effects of easy amplification, abundant reserves, and favorable market promotion

Inactive Publication Date: 2017-07-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these materials often face the disadvantages of rapid capacity fading caused by agglomeration caused by volume changes during the battery cycle, which limits the improvement of the cycle life of lithium-ion batteries.

Method used

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  • Ferric oxide/manganic oxide hollow porous sphere material, preparation and application thereof
  • Ferric oxide/manganic oxide hollow porous sphere material, preparation and application thereof
  • Ferric oxide/manganic oxide hollow porous sphere material, preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Fe 2 o 3 / Mn 2 o 3 The production method of hollow porous ball electrode material, it comprises the steps:

[0028] 1) Add 1mmol Fe(NO 3 ) 3 9H 2 O, 1mmol Mn(CH3 COO) 2 4H 2 O, 3 mmol H 2 C 2 o 4 2H 2 O was dissolved in 35mL DMF, stirred in a water bath at 70°C for 30min to obtain a wine red solution;

[0029] 2) Transfer the solution obtained above to a polytetrafluoroethylene liner and put it into a reaction kettle and take it out after hydrothermal heating at 200°C for 24 hours;

[0030] 3) After it is cooled to room temperature, the obtained yellow-brown precipitate is washed several times with alcohol and deionized water, and then dried in an oven at 70°C in an air atmosphere to obtain a precursor powder;

[0031] 4) Finally, the precursor was heated in an air atmosphere at 5°C min -1 The heating rate was raised to 450°C for 5 hours and then continued at 5°C min -1 Raise the temperature to 750°C for 10 hours to obtain Fe 2 o 3 / Mn 2 o 3 Hollow po...

Embodiment 2

[0041] 1) Add 1mmol Fe(NO 3 ) 3 9H 2 O, 1mmol Mn(CH 3 COO) 2 4H 2 O, 2.8 mmol H 2 C 2 o 4 2H 2 O was dissolved in 35mL DMF, stirred in a water bath at 70°C for 30min to obtain a wine red solution;

[0042] 2) Transfer the solution obtained above to a polytetrafluoroethylene liner and put it into a reaction kettle and take it out after hydrothermal heating at 200°C for 24 hours;

[0043] 3) After it is cooled to room temperature, the obtained yellow-brown precipitate is washed several times with alcohol and deionized water, and then dried in an oven at 70°C in an air atmosphere to obtain a precursor powder;

[0044] 4) Finally, the precursor was heated in an air atmosphere at 5°C min -1 The heating rate was raised to 500°C for 5 hours and then continued at 5°C min -1 Raise the temperature to 750°C for 10 hours to obtain Fe 2 o 3 / Mn 2 o 3 Hollow porous spherical electrode material.

[0045] With the Fe obtained in this example 2 o 3 / Mn 2 o 3 Hollow porous sph...

Embodiment 3

[0047] 1) Add 1mmol Fe(NO 3 ) 3 9H 2 O,1mmol Mn(CH 3 COO) 2 4H 2 O, 2.5 mmol H 2 C 2 o 4 2H 2 O was dissolved in 35mL DMF, stirred in a water bath at 70°C for 30min to obtain a wine red solution;

[0048] 2) Transfer the solution obtained above to a polytetrafluoroethylene lining and put it into a reaction kettle, heat it under water at 200°C for 8 hours, and then take it out;

[0049] 3) After it is cooled to room temperature, the obtained yellow-brown precipitate is washed several times with alcohol and deionized water, and then dried in an oven at 70°C in an air atmosphere to obtain a precursor powder;

[0050] 4) Finally, the precursor was heated in an air atmosphere at 5°C min -1 The heating rate was raised to 450°C for 5 hours and then continued at 5°C min -1 Raise the temperature to 750°C for 10 hours to obtain Fe 2 o 3 / Mn 2 o 3 Hollow porous spherical electrode material.

[0051] With the Fe obtained in this example 2 o 3 / Mn 2 o 3 Hollow porous sp...

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Abstract

The invention relates to an Fe2O3 / Mn2O3 hollow porous sphere electrode material, preparation and application thereof. The preparation method includes the steps of: 1) dissolving ferric nitrate, manganese acetate and oxalic acid in DMF, and stirring the substances evenly to obtain a mixed solution; 2) subjecting the mixed solution to hydrothermal reaction and then taking it out; 3) performing cooling to room temperature, washing the obtained precipitate several times, and then conducting drying to obtain precursor powder; and 4) finally sintering the precursor powder in air atmosphere, thus obtaining the hollow porous sphere electrode material. According to the invention, one-step hydrothermal method is employed to produce the electrode material with 20-100nm holes, the contact area of the electrode material and an electrolyte solution is increased, the diffusion distance of ions and electrons is shortened, the material can have enough free space to adapt to the volume change of electrode material, thus improving the cyclic stability of the material. As a lithium ion battery negative active material, the hollow porous sphere electrode material provided by the invention shows the characteristics of high capacity, good rate capability and good cycle stability.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, in particular to Fe 2 o 3 / Mn 2 o 3 Hollow porous spherical electrode material and its preparation and application. Background technique [0002] Lithium-ion batteries are widely used in portable energy storage devices due to their high efficiency, greenness, and low cost. However, graphite, the anode material for commercial applications, limits the energy density and power of lithium-ion batteries due to its low theoretical capacity. The increase in density makes it difficult to meet the growing demand. Therefore, the development of new anode materials with high theoretical capacity has become an urgent problem to be solved. Metal oxides such as Mn 2 o 3 , Fe 2 o 3 、Co 3 o 4 With its advantages of high theoretical capacity and abundant resources, it has become an alternative choice. However, these materials often face the disadvantages of rapid capacity fad...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 韩春华麦立强刘东娜任文皓
Owner WUHAN UNIV OF TECH
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