Solvothermal preparation method of 3D flower-shaped lithium iron phosphate positive electrode material assembled by two dimensional nanosheets

A two-dimensional nano, lithium iron phosphate technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as low ion diffusion rate, poor rate discharge capability, and low electronic conductivity , to achieve the effect of simple preparation process, improved rate performance and good dispersibility

Active Publication Date: 2018-01-26
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium iron phosphate also has the problems of low ion diffusion rate and low electronic conductivity, which leads to poor rate discharge capability and low power density.

Method used

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  • Solvothermal preparation method of 3D flower-shaped lithium iron phosphate positive electrode material assembled by two dimensional nanosheets
  • Solvothermal preparation method of 3D flower-shaped lithium iron phosphate positive electrode material assembled by two dimensional nanosheets
  • Solvothermal preparation method of 3D flower-shaped lithium iron phosphate positive electrode material assembled by two dimensional nanosheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Grind 5.56g of ferrous sulfate heptahydrate and 2.30g of ammonium dihydrogen phosphate, mix and dissolve in 50ml of ethylene glycol solvent, place in a 100mL beaker, put in a stirring magnet, heat up to 60°C and heat for 0.5 hours. Then add 0.630g of lithium carbonate and 10.5g of citric acid monohydrate into the container, and keep stirring at a constant temperature for 3h; As a surfactant, keep warm at 180°C. After 12 hours, the reaction was completed and cooled to room temperature. After repeated centrifugation and washing, the product was transferred to a vacuum drying oven at 120° C. for 6 hours to obtain a lithium iron phosphate cathode material with uniform particle size.

[0033] figure 1 It is a scanning electron microscope photo of the obtained lithium iron phosphate, and the synthetic material is a 3D flower-like morphology with holes assembled by two-dimensional nanosheets.

[0034] The electrochemical properties of the obtained samples were tested accord...

Embodiment 2

[0036] Grind 5.56g of ferrous sulfate heptahydrate and 2.30g of ammonium dihydrogen phosphate, mix and dissolve in 50ml of ethylene glycol solvent, place in a 100mL beaker, put in a stirring magnet, heat up to 60°C and heat for 0.5 hours. Then add 0.630g of lithium carbonate and 10.5g of citric acid monohydrate into the container, and keep stirring at a constant temperature for 3h; As a surfactant, keep warm at 180°C. After 12 hours, the reaction was completed and cooled to room temperature. After repeated centrifugation and washing, the product was transferred to a vacuum drying oven at 120° C. for 6 hours to obtain a lithium iron phosphate cathode material with uniform particle size.

[0037] The electrochemical performance was tested according to the method of Example 1, and the first-cycle reversible capacity of the obtained positive electrode material was 138mAh / g.

Embodiment 3

[0039]Grind 5.56g of ferrous sulfate heptahydrate and 2.30g of ammonium dihydrogen phosphate, mix and dissolve in 50ml of ethylene glycol solvent, place in a 100mL beaker, put in a stirring magnet, heat up to 60°C and heat for 0.5 hours. Then add 0.630g of lithium carbonate and 10.5g of citric acid monohydrate into the container, and keep stirring at a constant temperature for 3h; As a surfactant, keep warm at 180°C; continue for 12 hours, and cool to room temperature after the reaction. After repeated centrifugation and washing, the product was transferred to a vacuum drying oven at 120° C. for 6 hours to obtain a lithium iron phosphate cathode material with uniform particle size.

[0040] The electrochemical performance was tested according to the method of Example 1, and the first-cycle reversible capacity of the obtained positive electrode material was 136mAh / g.

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Abstract

The invention relates to a solvothermal preparation method of a 3D flower-shaped lithium iron phosphate positive electrode material assembled by two dimensional nanosheets, and belongs to the preparation method of the positive electrode material lithium iron phosphate for a power lithium ion battery. The method comprises the steps: firstly, adding an iron source and a phosphorus source to a reactor, carrying out magnetic heating and stirring to obtain a deep green suspension, then adding a lithium source and a complexing agent, continuously stirring for several hours, then transferring the reactant to a hydrothermal kettle, at the same time, adding a solvent having a certain volume proportion and having surfactant properties, carrying out a heat preservation reaction, after the reaction isfinished, cooling to room temperature, carrying out centrifugal washing, and carrying out vacuum drying. Two mixed solvents are adopted in the preparation, and one is the solvent having the surfactant properties; according to the 3D flower-shaped lithium iron phosphate assembled by the nanosheets and having a porous structure, on one hand, complete wetting of an electrolyte and a positive electrode material is facilitated, on the other hand, the lithium ion migration diffusion path is shortened, the ion migration rate under battery multiplying power discharge is improved, the experiment process is simple, and the positive electrode material LiFePO4 with good performance can be prepared.

Description

technical field [0001] The invention belongs to the technical field, and in particular relates to a solvothermal preparation method for assembling a 3D flower-shaped lithium iron phosphate cathode material into two-dimensional nanosheets. Background technique [0002] Since the 1990s, the research and application of lithium-ion batteries have developed rapidly. This is because lithium-ion batteries have the advantages of high working voltage, high capacity, good cycle performance, and good safety. Therefore, the application fields are more and more extensive, such as in the field of communication equipment, electric vehicles, and industrial robotic equipment. At present, lithium iron phosphate, as a new generation of lithium-ion battery cathode material, has been more extensively studied. [0003] Common cathode materials mainly include lithium cobaltate, lithium manganate, ternary materials, lithium iron phosphate, etc. The price of lithium cobaltate is relatively high du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 王娟杨玉兵牛瑶杜振强
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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