Method for preparing lithium iron phosphate positive electrode material using polycyclic aromatic hydrocarbon resin as carbon source

A polycyclic aromatic hydrocarbon resin, lithium iron phosphate technology, used in battery electrodes, structural parts, electrical components, etc., can solve the problems of unstable asphalt structure, poor product stability, complex asphalt components, etc., and achieve a high softening point. , low production cost, good electrical performance consistency

Active Publication Date: 2018-10-23
武汉保华石化新材料开发股份有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] 1) The composition of asphalt is very complex, it is a very complex mixture, the structure of asphalt is unstable, it is easy to be oxidized, its composition will change when it encounters high temperature, and the stability of the product is also very poor;
[0008] 2) Asphalt has a certain degree of adhesion, and it will stick to the equipment during the mixing process, which is not easy to clean up;
[0009] 3) Asphalt also contains N, O, S and other elements, high temperature will produce SO 2 (sulfur dioxide) and other gases pollute the environment and are also harmful to the human body

Method used

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  • Method for preparing lithium iron phosphate positive electrode material using polycyclic aromatic hydrocarbon resin as carbon source
  • Method for preparing lithium iron phosphate positive electrode material using polycyclic aromatic hydrocarbon resin as carbon source
  • Method for preparing lithium iron phosphate positive electrode material using polycyclic aromatic hydrocarbon resin as carbon source

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preparation example Construction

[0040] The preparation method of polycyclic aromatic hydrocarbon resin comprises the following steps:

[0041]1) Using heavy aromatics in heavy residual oil as a raw material, using at least one of a compound having a vinyl structure, phenol, and aldehyde as a cross-linking agent, under the action of an acidic catalyst and an inorganic salt catalyst, conduct a condensation reaction to generate B Order condensation polycyclic polynuclear aromatic hydrocarbon resin;

[0042] 2) curing the B-stage condensed polycyclic polynuclear aromatic hydrocarbon resin to obtain the C-stage heat-resistant condensed polycyclic polynuclear aromatic hydrocarbon resin.

[0043] In the step 2), the volume fraction of the ethanol solution is 50-100%; the pelletizing time is 1-10 hours.

[0044] In the step 3), the temperature of the oven is 60-90°C.

[0045] In the step 4), the rate of temperature rise from room temperature to 370-390°C is 3-8°C / min; the rate of temperature rise from 370-390°C to...

Embodiment 1

[0062] A kind of method that utilizes polycyclic aromatic hydrocarbon resin to prepare lithium iron phosphate cathode material as carbon source, comprises the following steps:

[0063] 1) Weigh iron phosphate and lithium hydroxide in a weight ratio of 1:4; mix iron phosphate, lithium hydroxide and polycyclic aromatic hydrocarbon resins evenly; obtain a mixture; wherein, the weight of polycyclic aromatic hydrocarbon resins accounts for 10% of the total amount of raw materials added 4%;

[0064] 2) Add the mixture to the ethanol solution, and perform wet pelletizing in a planetary ball mill at a rotational speed of 300r / min for 6 hours; obtain a precursor slurry containing ball milling;

[0065] 3) Put the ball-milled precursor slurry obtained in step 2) into an oven at a temperature of 80°C for drying, then grind and sieve to obtain the precursor;

[0066] 4) Place the precursor prepared in step 3) in a high-temperature furnace. Under the protection of nitrogen, the high-tempe...

Embodiment 2

[0068] A method for preparing a lithium iron phosphate positive electrode material using a polycyclic aromatic hydrocarbon resin as a carbon source, comprising the following steps:

[0069] 1) Weigh iron phosphate and lithium hydroxide in a weight ratio of 1:4; mix iron phosphate, lithium hydroxide and polycyclic aromatic hydrocarbon resins evenly; obtain a mixture; wherein, the weight of polycyclic aromatic hydrocarbon resins accounts for 10% of the total amount of raw materials added 10%;

[0070] 2) Add the mixture to the ethanol solution, and perform wet pelletizing in a planetary ball mill at a rotational speed of 300r / min for 6 hours; obtain a precursor slurry containing ball milling;

[0071] 3) Put the ball-milled precursor slurry obtained in step 2) into an oven at a temperature of 80°C for drying, then grind and sieve to obtain the precursor;

[0072] 4) Place the precursor prepared in step 3) in a high-temperature furnace. Under the protection of nitrogen, the high...

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Abstract

The invention discloses a method for preparing a lithium iron phosphate positive electrode material by taking polycyclic aromatic hydrocarbon rein as a carbon source. The method comprises the steps of weighing iron phosphate and lithium hydroxide at the weight ratio of 1:3-5 firstly; uniformly mixing iron phosphate, lithium hydroxide and polycyclic aromatic hydrocarbon rein to obtain a mixture; adding the mixture into an ethanol solution and palletizing by adopting a wet process to obtain slurry containing ball-milled precursor; drying the slurry containing the ball-milled precursor in a drying oven, and pulverizing and screening the slurry to obtain a precursor; and finally putting the precursor into a high temperature furnace and performing thermal insulation to obtain the lithium iron phosphate positive electrode material. The carbon source adopted by the method is the polycyclic aromatic hydrocarbon rein, so that low temperature volatile component residue barely exists; the carbon content is more than 90wt%; the baking technological conditions have relatively less influences on a pyrolysis process, carbon residue rate and the like; and the obtained material is high in electrical property consistency.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and specifically refers to a method for preparing a lithium iron phosphate cathode material by using a polycyclic aromatic hydrocarbon resin as a carbon source. Background technique [0002] In recent years, with the increasingly serious problems of energy shortage and environmental pollution, the country vigorously advocates energy conservation, emission reduction and green environmental protection, and the research and development of electric vehicles (EV) and hybrid vehicles (HEV) is imperative. At present, the bottleneck restricting the development of electric vehicles is whether to develop cheap, safe and environment-friendly secondary batteries. Lithium-ion batteries are recognized as the most promising electric vehicle power batteries due to their high specific energy and high specific power. The safety of lithium-ion batteries largely depends on the cathode material. Among various l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 傅正美伍晓珈贾红涛雷新
Owner 武汉保华石化新材料开发股份有限公司
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