Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of graphene-based LiFePO4/C composite material

A composite material, graphene-based technology, applied in graphene, graphite, chemical instruments and methods, etc., can solve problems such as poor rate performance and poor conductivity of lithium iron phosphate cathode materials, and achieve high specific capacity, easy control, and technology. Simple process effect

Active Publication Date: 2014-12-17
GUOGUANG ELECTRIC
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a graphene-based LiFePO 4 / C composite materials to solve the deficiencies in the existing lithium iron phosphate preparation technology and the poor conductivity and poor rate performance of lithium iron phosphate cathode materials

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of graphene-based LiFePO4/C composite material
  • Preparation method of graphene-based LiFePO4/C composite material
  • Preparation method of graphene-based LiFePO4/C composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Graphene oxide and ferric sulfate are dissolved in deionized water at a mass ratio of graphene oxide to iron element of 0.1:1 to prepare a mixed solution with an iron ion concentration of 1 mol / L, and then disperse by ultrasonic waves for 3 hours to obtain a dispersed solution. Iron salt solution with graphene oxide;

[0043] Prepare a phosphoric acid solution with a concentration of 1mol / L.

[0044] The iron salt solution and phosphoric acid solution dispersed with graphene oxide obtained above are added to the reactor with stirring according to the ratio of the amount of substances Fe: P = 1: 1.1, and the concentration is 1mol / L at the same time. Adjust the pH of the reaction feed liquid to 2.1, control the temperature to 60°C for 5 hours to react to obtain an emulsion, filter and wash the emulsion obtained above, and dry the filter cake in a blast drying oven at 80°C for 24 hours. Obtain iron phosphate / graphene oxide precursor;

[0045] The above-mentioned iron pho...

Embodiment 2

[0047] Graphene oxide and iron nitrate are dissolved in deionized water at a mass ratio of graphene oxide and iron element of 0.2:1 to prepare a mixed solution with an iron ion concentration of 0.5 mol / L, which is then dispersed by ultrasonic waves for 3 hours to obtain An iron salt solution dispersed with graphene oxide;

[0048] Prepare a solution of ammonium dihydrogen phosphate with a concentration of 0.5 mol / L.

[0049] The above obtained iron salt solution dispersed with graphene oxide and ammonium dihydrogen phosphate solution are added into the reactor with stirring according to the ratio of the amount of substances Fe:P=1:1, and at the same time, the concentration is 0.5mol / L of sodium hydroxide aqueous solution to adjust the pH of the reaction feed liquid to 2.5, control the temperature to 80 ° C for 3 hours to obtain an emulsion, filter and wash the above obtained emulsion, and place the filter cake at 80 ° C for air drying Dry in the oven for 24 hours to obtain t...

Embodiment 3

[0053] Use graphene oxide and ferrous sulfate to dissolve in deionized water at a mass ratio of graphene oxide to iron element of 0.3:1, and then add excess H 2 o 2 After oxidation, prepare a mixed solution with an iron ion concentration of 2mol / L, and then place it in ultrasonic dispersion for 3 hours to obtain an iron salt solution dispersed with graphene oxide;

[0054] Prepare a diammonium hydrogen phosphate solution with a concentration of 2 mol / L.

[0055] The above obtained iron salt solution dispersed with graphene oxide and diammonium hydrogen phosphate solution are added to the reactor with stirring according to the ratio of the amount of substances Fe: P=1: 1, and at the same time, the concentration is 5mol / L of sodium hydroxide aqueous solution to adjust the pH of the reaction feed liquid to 2.5, control the temperature to 80 ° C for 3 hours to obtain an emulsion, filter and wash the above obtained emulsion, and place the filter cake in an 80 ° C blast drying ove...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

Abstract

A method for preparing a graphene-based LiFePO4 / C composite material is disclosed to solve the problem that both the conductivity and the rate capability of the existing lithium iron phosphate positive electrode materials are poor. The keys of the method are: 1) preparing an iron salt solution having graphene oxide dissolved therein; 2) preparing an iron phosphate / graphene oxide precursor; 3) preparing the graphene-based LiFePO4 / C composite materials. The method's beneficial effects lie in: the technological process is simple and easy to control, the obtained graphene-based LiFePO4 / C composite material, having high specific capacity, good cycle performance and excellent rate capability, is especially suitable for power battery application field.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode material preparation, in particular to a graphene-based LiFePO 4 / C composite material preparation method. Background technique [0002] Energy is an important material basis for the survival and development of human society. With the continuous development of economy and society, the world's demand for energy is also increasing. Under the circumstances of global warming and deteriorating ecological environment, lithium-ion batteries, as a kind of green energy, have received more and more attention. [0003] Lithium iron phosphate has a higher voltage platform (3.4~3.5V), higher theoretical capacity (170mAh / g), good cycle performance (LiFePO synthesized under optimized conditions 4 It can be recycled more than 2000 times), good stability, good high temperature performance, good safety performance, simple synthesis process, environmentally friendly, non-toxic, rich raw materi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCC01B31/0446Y02E60/122H01M4/5825C01B25/45H01M4/1397H01M4/364H01M4/136H01M4/04C01B32/23C01B32/184H01B1/06C01B25/375H01M4/625Y02E60/10C01B32/00
Inventor 胡国荣曹雁冰武开鹏彭忠东杜柯
Owner GUOGUANG ELECTRIC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com