A solvothermal preparation method of lithium iron phosphate cathode material assembled into 3D flower-like two-dimensional nanosheets

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

Active Publication Date: 2020-01-07
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
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  • 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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  • A solvothermal preparation method of lithium iron phosphate cathode material assembled into 3D flower-like two-dimensional nanosheets
  • A solvothermal preparation method of lithium iron phosphate cathode material assembled into 3D flower-like two-dimensional nanosheets
  • A solvothermal preparation method of lithium iron phosphate cathode material assembled into 3D flower-like 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 performance test of the obtained samples was carried ...

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 lithium iron phosphate positive electrode material in which two-dimensional nano sheets are assembled into a 3D flower shape, and belongs to a preparation method of lithium iron phosphate positive electrode material for power lithium ion batteries. First, add iron source and phosphorus source into the reactor, magnetically heat and stir until a dark green suspension, then add lithium source and complexing agent, continue stirring for several hours, then transfer the reactant to a hydrothermal kettle, and add A certain volume ratio of a solvent with surfactant properties is incubated for the reaction, cooled to room temperature after the reaction, centrifugal washing, and vacuum drying. The present invention adopts two kinds of mixed solvents in preparation, one is a solvent with surfactant properties; the obtained nanosheets are assembled into 3D flower-shaped lithium iron phosphate with a hole-like structure, which is beneficial to the complete infiltration of the electrolyte and the positive electrode material on the one hand, On the other hand, the migration and diffusion paths of lithium ions are shortened, and the ion migration rate under the rate discharge of the battery is improved. The experimental process is simple, and the cathode material LiFePO with good performance can be prepared. 4 .

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 Patents(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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