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Nitrogen and phosphorus co-doped biomass carbon/lithium iron phosphate composite material and preparation method thereof

A lithium iron phosphate, biomass carbon technology, applied in nanotechnology, electrochemical generators, nanotechnology and other directions for materials and surface science, can solve problems such as poor cycle performance and low conductivity

Inactive Publication Date: 2021-05-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of low electrical conductivity and poor cycle performance of lithium iron phosphate materials in the prior art, the present invention provides a nitrogen and phosphorus co-doped biomass carbon / lithium iron phosphate composite material and its preparation method

Method used

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  • Nitrogen and phosphorus co-doped biomass carbon/lithium iron phosphate composite material and preparation method thereof
  • Nitrogen and phosphorus co-doped biomass carbon/lithium iron phosphate composite material and preparation method thereof
  • Nitrogen and phosphorus co-doped biomass carbon/lithium iron phosphate composite material and preparation method thereof

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preparation example Construction

[0019] 1. A preparation method of nitrogen and phosphorus co-doped biomass carbon / lithium iron phosphate composite material, characterized in that the specific steps are as follows:

[0020] Step (1), take a fresh egg yolk and stir mechanically to obtain egg yolk liquid, and the speed is controlled at 50r / min;

[0021] In step (2), the egg yolk liquid obtained in step (1) and deionized water are mixed evenly according to the volume ratio of 0.5~2:1, and then the lithium iron phosphate precursor is added to the mixed solution with electromagnetic stirring until it is completely mixed evenly to obtain a viscous slurry;

[0022] Step (3), drying the slurry obtained in step (2) in a vacuum oven at a temperature of 60-80°C for 6-12 hours;

[0023] Step (4), put the dried sample obtained in step (3) into a crucible after grinding, and calcinate in a vacuum tube furnace at 600~750°C for 4~16h under the protection of argon to obtain nitrogen and phosphorus co-doped biomass carbon / ...

Embodiment 1

[0026] Step 1. Take a fresh egg yolk and mechanically stir it to obtain egg yolk liquid (the speed is controlled at 50r / min);

[0027] Step 2. Take 0.5mL egg yolk liquid and deionized water and mix evenly according to the volume ratio of 2:1, then add lithium iron phosphate precursor to the mixed solution and electromagnetically stir until completely mixed evenly to obtain a viscous slurry;

[0028] Step 3, drying the slurry obtained in step 2 in a vacuum oven at a temperature of 80° C. for 12 hours;

[0029] Step 4. Put the dried sample obtained in step 3 into a crucible after being ground, and in a vacuum tube furnace under the protection of an argon atmosphere, the heating rate is 5°C / min, and the calcination temperature is 650°C for 6h to obtain nitrogen-phosphorus co- Doped biomass carbon / lithium iron phosphate composite.

Embodiment 2

[0031] Step 1. Take a fresh egg yolk and mechanically stir it to obtain egg yolk liquid (the speed is controlled at 50r / min);

[0032] Step 2. Take 1mL of egg yolk liquid and deionized water and mix evenly according to the volume ratio of 1:1, then add the lithium iron phosphate precursor to the mixed solution and stir it until it is completely mixed evenly to obtain a viscous slurry;

[0033] Step 3, drying the slurry obtained in step 2 in a vacuum oven at a temperature of 80° C. for 12 hours;

[0034] Step 4. Put the dried sample obtained in step 3 into a crucible after being ground, and in a vacuum tube furnace under the protection of an argon atmosphere, the heating rate is 5°C / min, and the calcination temperature is 650°C for 6h to obtain nitrogen-phosphorus co- Doped biomass carbon / lithium iron phosphate composite.

[0035] The X-ray diffraction pattern of nitrogen and phosphorus co-doped biomass carbon / lithium iron phosphate composite material prepared in this example ...

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Abstract

The invention discloses a nitrogen and phosphorus co-doped biomass carbon / lithium iron phosphate composite material and a preparation method thereof. The method comprises the following steps: taking a fresh egg yolk, and mechanically stirring to obtain a yolk liquid, wherein the rotating speed is controlled at 50r / min; uniformly mixing the obtained yolk liquid and deionized water according to the volume ratio of (0.5-2): 1, then adding a lithium iron phosphate precursor into the mixed liquid, and electromagnetically stirring until the mixture is completely and uniformly mixed to obtain viscous slurry; drying the obtained slurry in a vacuum drying oven at the temperature of 60-80 DEG C for 6-12 hours; and grinding the obtained dried sample, putting the ground dried sample into a crucible, and calcining in a vacuum tube furnace at 600-750 DEG C for 4-16 hours under the protection of argon to obtain the nitrogen and phosphorus co-doped biomass carbon / lithium iron phosphate composite material. The material can be used as a high-performance lithium ion battery positive electrode material. The raw material for preparing the composite material is biomass egg yolk, and has the advantages of being environmentally friendly, easy to obtain, low in cost and the like.

Description

technical field [0001] The invention relates to a nitrogen-phosphorus co-doped biomass carbon / lithium iron phosphate composite material and a preparation method thereof, belonging to the technical field of cathode materials for lithium-ion batteries. Background technique [0002] With the rapid development of human society and economy, the demand for energy is increasing day by day, which leads to the depletion of traditional fossil energy and the serious deterioration of the ecological environment. In order to deal with the increasingly urgent and severe global energy and environmental problems, it has become the consensus of the whole world to develop clean and renewable new energy and develop its key technologies. As a simple, fast, efficient and sustainable power storage system, lithium-ion batteries have excellent comprehensive performance (light weight, high voltage, high energy density, high output power, small self-discharge, long cycle life, no memory effect, enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/366H01M4/5825H01M4/62H01M4/625H01M10/0525B82Y30/00B82Y40/00Y02E60/10
Inventor 姚耀春李银张克宇米如中王丽杨斌马文会戴永年梁风杨桂玲
Owner KUNMING UNIV OF SCI & TECH
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