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Alkaline earth metal ferrite electrode material and preparation method and application thereof

A technology of alkaline earth metals and ferrites, applied in the field of nanomaterials and electrochemistry, to achieve good cycle stability, high tap density, and excellent electrochemical performance

Inactive Publication Date: 2018-01-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Alkaline earth metal ferrites, which are used as negative electrode active materials for lithium-ion batteries, and their preparation methods and related research work are still rarely reported

Method used

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  • Alkaline earth metal ferrite electrode material and preparation method and application thereof
  • Alkaline earth metal ferrite electrode material and preparation method and application thereof
  • Alkaline earth metal ferrite electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of alkaline earth metal ferrite electrode material includes the following steps:

[0032] 1) Weigh 2.0g PVP and add it to 25ml DMF, and stir with a magnetic stirrer for 60 minutes;

[0033] 2) Weigh 4.0mmol Ca(NO 3 ) 2 (or Mg(NO 3 ) 2 ) and 8.0mmol Fe(NO 3 ) 3 ;

[0034] 3) Add the medicine obtained in step 2) to the solution obtained in step 1), and stir with a magnetic stirrer for 3 hours;

[0035] 4) Transfer the solution obtained in step 3) to an oven at 80 degrees centigrade to dry for 24 hours, and after naturally cooling to room temperature, take out a red glassy product;

[0036] 5) heat-treat the dried product obtained in step 4) at 250°C for 1 hour in an air atmosphere with a heating rate of 2°C / min, then heat-treat at 800°C for 5 hours in an air atmosphere at a heating rate of 5°C / min, and let it The sample is cooled naturally, and the calcium ferrite (or magnesium ferrite) sample is obtained immediately after taking it out.

[0037] ...

Embodiment 2

[0046] The preparation of alkaline earth metal ferrite electrode material includes the following steps:

[0047] 1) Weigh 4.0g PVP and add it to 50ml DMF, stir with a magnetic stirrer for 60 minutes;

[0048] 2) Weigh 8.0mmol Ca(NO 3 ) 2 (or Mg(NO 3 ) 2 ) and 16.0mmol Fe(NO 3 ) 3 ;

[0049] 3) Add the medicine obtained in step 2) to the solution obtained in step 1), and stir with a magnetic stirrer for 3 hours;

[0050] 4) Transfer the solution obtained in step 3) to an oven at 80 degrees centigrade to dry for 24 hours, and after naturally cooling to room temperature, take out a red glassy product;

[0051] 5) heat-treat the dried product obtained in step 4) at 250°C for 1 hour in an air atmosphere with a heating rate of 2°C / min, then heat-treat at 800°C for 5 hours in an air atmosphere at a heating rate of 5°C / min, and let it The sample is cooled naturally, and the calcium ferrite (or magnesium ferrite) sample is obtained immediately after taking it out.

[0052] In ...

Embodiment 3

[0054] The preparation of alkaline earth metal ferrite electrode material includes the following steps:

[0055] 1) Weigh 2.0g PVP and add it to 25ml DMF, and stir with a magnetic stirrer for 60 minutes;

[0056] 2) Weigh 4.0mmol Ca(NO 3 ) 2 (or Mg(NO 3 ) 2 ) and 8.0mmol Fe(NO 3 ) 3 ;

[0057] 3) Add the medicine obtained in step 2) to the solution obtained in step 1), and stir with a magnetic stirrer for 3 hours;

[0058] 4) Transfer the solution obtained in step 3) to an oven at 80 degrees centigrade to dry for 24 hours, and after naturally cooling to room temperature, take out a red glassy product;

[0059] 5) heat-treat the dried product obtained in step 4) at 250°C for 1 hour in an air atmosphere at a heating rate of 2°C / min, then heat-treat at 600°C in an air atmosphere for 5 hours at a heating rate of 5°C / min, and let it The sample is cooled naturally, and the calcium ferrite (or magnesium ferrite) sample is obtained immediately after taking it out.

[0060] Fo...

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Abstract

The invention relates to a preparation method and an application of alkaline earth metal ferrite. The preparation method comprises the following steps of 1) weighing polyvinylpyrrolidone and adding toN, N-dimethylformamide, and performing stirring to obtain a clear and transparent solution; 2) weighing an iron source and a calcium source or a magnesium source based on proportion and adding to thesolution obtained in the step 1), and performing continuous stirring; 3) drying the solution obtained in the step 2) to obtain a red glass-shaped product; and 4) performing sintering heat treatment on the dried product obtained in the step 3), firstly performing low-temperature heat treatment and then performing high-temperature heat treatment, and finally performing natural cooling to obtain a CaFe<2>O<4> sample or a MgFe<2>O<4> sample. The preparation method has the beneficial effects as follows: the alkaline earth metal ferrite, used as a novel negative electrode active material of the lithium ion battery, has excellent electrochemical performance, relatively high specific capacity, ultra high cycle stability and excellent rate capability; and meanwhile, the process is simple, the rawmaterials are low in cost, the synthesis process is green and environment friendly, the output is high, and large-scale production can be realized.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, and in particular relates to a preparation method and application of a class of alkaline earth metal ferrites. Background technique [0002] With the increasing awareness of environmental protection and the concern for resource utilization, rechargeable batteries have gradually become the focus of research, and the successful application of lithium primary batteries has greatly promoted the research and development of lithium-ion batteries, making lithium-ion batteries a focus of attention. focus. Lithium-ion batteries have been widely used as mobile power sources in low-power and low-energy-density products such as mobile phones, notebook computers, digital cameras, and music players. In the near future, lithium-ion batteries with high power and high energy density are likely to occupy a major market share in the on-board power supply market for electric vehicles. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/525H01M10/0525
CPCY02E60/10
Inventor 韩春华张枭麦立强徐小明
Owner WUHAN UNIV OF TECH
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