Unlock instant, AI-driven research and patent intelligence for your innovation.

Hydroxyl lithium iron phosphate/graphene composite anode material and preparation method thereof

A lithium iron hydroxyphosphate and graphene composite technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of limited wide application, poor lithium ion diffusion coefficient, low conductivity of lithium iron phosphate, etc.

Active Publication Date: 2019-03-19
HENAN INST OF SCI & TECH
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium iron phosphate has low electrical conductivity and poor lithium-ion diffusion coefficient, especially at low temperature, which limits its wide application in the field of lithium-ion batteries for electric vehicles and hybrid vehicles

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
  • Hydroxyl lithium iron phosphate/graphene composite anode material and preparation method thereof
  • Hydroxyl lithium iron phosphate/graphene composite anode material and preparation method thereof
  • Hydroxyl lithium iron phosphate/graphene composite anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of lithium iron phosphate / graphene composite cathode material, comprising the following steps:

[0032] (1) Weigh 0.2142 g LiOH·H 2 O joins 12ml concentration and is in the graphene oxide dispersion liquid of 1.66 mg / ml, then drops the analytical pure H of 0.1962 g 3 PO 4 (H 3 PO 4 content of 85%) using a magnetic stirrer to stir evenly to obtain liquid A;

[0033] (2) Weigh 0.4728 g of FeSO 4 ·7H 2 O was added to 12ml of graphene oxide dispersion with a concentration of 1.66 mg / ml, and stirred evenly with a magnetic stirrer to obtain liquid B;

[0034] (3) Slowly add liquid B to liquid A, stir for 0.5 h, add 8 ml of absolute ethanol, stir for 0.5 h, transfer the obtained mixed solution to a hydrothermal reactor, and react at 180 °C for 5 h to obtain The product is centrifugally washed and freeze-dried to obtain lithium iron phosphate / graphene composite cathode material.

Embodiment 2

[0050] A preparation method of lithium iron phosphate / graphene composite cathode material, comprising the following steps:

[0051] (1) Weigh 0.2142 g LiOH·H 2 O joins 18ml concentration and is in the graphene oxide dispersion liquid of 0.5 mg / ml, then drops the analytical pure H of 0.1962 g 3 PO 4 (H 3 PO 4 content of 85%) using a magnetic stirrer to stir evenly to obtain liquid A;

[0052] (2) Weigh 0.4728 g of FeSO 4 ·7H 2 O was added to 18ml concentration of 0.5 mg / ml graphene oxide dispersion, and stirred evenly with a magnetic stirrer to obtain liquid B;

[0053] (3) Slowly add liquid B to liquid A, stir for 0.2 h, add 8 ml of absolute ethanol, stir for 1 h, transfer the obtained mixed solution to a hydrothermal reaction kettle, and react at 150 °C for 6 h to obtain The product is centrifugally washed and freeze-dried to obtain lithium iron phosphate / graphene composite cathode material.

Embodiment 3

[0055] A preparation method of lithium iron phosphate / graphene composite cathode material, comprising the following steps:

[0056] (1) Weigh 0.2142 g LiOH·H 2 O joins 8ml concentration and is in the graphene oxide dispersion liquid of 3.5mg / ml, then drops the analytical pure H of 0.1962g 3 PO 4 (H 3 PO 4 content of 85%) using a magnetic stirrer to stir evenly to obtain liquid A;

[0057] (2) Weigh 0.4728 g of FeSO 4 ·7H 2 O was added to 8ml concentration of 3.5 mg / ml graphene oxide dispersion liquid, and stirred evenly with a magnetic stirrer to obtain liquid B;

[0058] (3) Slowly add liquid B to liquid A, stir for 1 h, add 8 ml of absolute ethanol, stir for 0.2 h, transfer the obtained mixed solution to a hydrothermal reaction kettle, and react at 200 °C for 3 h to obtain The product is centrifugally washed and freeze-dried to obtain the lithium iron phosphate / graphene composite cathode material.

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

No PUM Login to View More

Abstract

The invention discloses a preparation method of a hydroxyl lithium iron phosphate / graphene composite anode material. The hydroxyl lithium iron phosphate / graphene composite anode material is prepared through a solvothermal method by taking lithium hydroxide, phosphoric acid, ferrous sulfate and graphene oxide as raw materials and water and ethanol as a solvent. The phase composition of the materialis analyzed by using XRD testing and SEM, and the material is taken as an anode to assemble a lithium ion battery to research the electrochemical properties. The result verifies that the specific capacity of 129mAh / g can be obtained at 0.1 C and the hydroxyl lithium iron phosphate / graphene composite anode material still has 98% coulombic efficiency if being cycled for 50 times at 0.5 C.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy materials, in particular to a lithium iron phosphate / graphene composite positive electrode material and a preparation method thereof. Background technique [0002] In recent years, due to the excessive use of fossil energy, which has caused great harm to the environment, economic development cannot be at the cost of damaging the environment on which we live. Therefore, the development of environmentally friendly and sustainable new energy materials is a hot spot in energy development. At present, new energy sources such as solar energy, wind energy, and tidal energy have great potential. They reduce environmental problems caused by energy use, but they also face the key issue of energy storage. Energy storage technology is extremely critical in the process of energy utilization. One step, among them, the secondary battery is the most important way of energy storage. Among them, lit...

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
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 马晶晶李元超李学伟
Owner HENAN INST OF SCI & TECH