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Method for preparing lithium iron phosphate compound anode material

A composite cathode material, lithium iron phosphate technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problem that the product quality and process level are not enough to meet the power battery, it is difficult to ensure the overall uniformity of carbon coating and material phase, The problems of low conductivity of lithium iron phosphate can shorten the production cycle, improve the diffusion capacity, and shorten the reaction time.

Inactive Publication Date: 2013-08-28
CHANGZHOU HECO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many synthesis methods of lithium iron phosphate, but it is difficult to scale up the production. The main reason is that the electrical conductivity of lithium iron phosphate is low, it is difficult to ensure the overall uniformity of carbon coating and material phase during the synthesis process, the particle size is not easy to control, and the coating process is unstable. etc., resulting in poor product batch
At present, domestic manufacturers of lithium iron phosphate materials basically have such problems. The product quality and process level are not enough to meet the needs of power batteries.

Method used

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  • Method for preparing lithium iron phosphate compound anode material
  • Method for preparing lithium iron phosphate compound anode material
  • Method for preparing lithium iron phosphate compound anode material

Examples

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Embodiment 1

[0032] A method for preparing lithium iron phosphate composite cathode material, using lithium citrate, ferrous chloride, lithium dihydrogen phosphate, sodium carboxymethyl cellulose as raw materials, and the ratio of the above ingredients is: Li:Fe :P:C=1.2:1:1:1; The method described uses polyethylene oxide as a surfactant;

[0033] The method includes the following steps:

[0034] (1) Add polyethylene oxide and sodium carboxymethyl cellulose to the reaction kettle at 80°C under ultrasonic conditions, add tetraethyl glycol solvent and stir for 3 hours, and then fill with argon;

[0035] (2) Prepare tetraethyl glycol solutions of lithium dihydrogen phosphate and lithium citrate, and add these two solutions to the reaction kettle described in step (1) at the same time, ultrasonic and stirring for 4 hours;

[0036] (3) Prepare a tetraethyl glycol solution of ferrous chloride, add antioxidant 1010, keep stirring, add to the reaction kettle of step (2), ultrasonic and stir for 4 hours, t...

Embodiment 2

[0042] A method for preparing lithium iron phosphate composite cathode material, using lithium hydroxide, ferrous nitrate, phosphoric acid, and β-cyclodextrin as raw materials, calculated by mole, and the above-mentioned ingredients ratio is: Li:Fe:P:C= 0.9:1:1:1; the method described uses polyethylene oxide as a surfactant;

[0043] The method includes the following steps:

[0044] (1) Add polyethylene oxide and β-cyclodextrin to the reaction kettle at 90°C under ultrasonic conditions, add acetonitrile solvent and stir for 3 hours, and then fill with argon;

[0045] (2) Prepare acetonitrile solutions of phosphoric acid and lithium hydroxide, add these two solutions to the reaction kettle described in step (1) at the same time, sonicate and stir for 5 hours;

[0046] (3) Prepare the acetonitrile solution of ferrous nitrate, add antioxidant 2246, stir continuously, add to the reaction kettle of step (2), ultrasonic and stir for 3 hours, the antioxidant, in terms of mass percentage, Th...

Embodiment 3

[0052] A method for preparing lithium iron phosphate composite cathode material, using ferrous citrate, lithium dihydrogen phosphate, and polyvinyl alcohol as raw materials, calculated by mole, and the above-mentioned ingredients ratio is: Li:Fe:P:C=1: 1:1:0.3; the method uses polyethylene oxide as a surfactant;

[0053] The method includes the following steps:

[0054] (1) Add polyethylene oxide and polyvinyl alcohol to the reaction kettle at 90°C under ultrasonic conditions, add glycerol solvent and stir for 2 hours, and then fill with argon;

[0055] (2) Prepare a glycerol solution of lithium dihydrogen phosphate, and then add this solution to the reaction kettle described in step (1), ultrasonically and stir for 5 hours;

[0056] (3) Prepare a glycerol solution of ferrous citrate, add antioxidant 1076, keep stirring, add it to the reaction kettle of step (2), ultrasonic and stir for 3 hours, the antioxidant, according to mass percentage Calculated, its dosage is 0.1% of the iron ...

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Abstract

The invention discloses a method for preparing a lithium iron phosphate compound anode material. In the method, a lithium source compound, an iron source compound, a phosphorus source compound and a carbon source compound serve as raw materials according to the mol ratio of Li:Fe:P:C of 0.9-1.2:0.95-1:1:0-1; and polyoxyethylene serves as a surfactant. The method has less process steps, shortens aproduction period, saves cost, improves the electric conductivity of a lithium iron phosphate compound material to the maximum by utilizing least carbon, and simultaneously improves the content of active substances in the material.

Description

Technical field [0001] The invention relates to the field of secondary lithium ion batteries, in particular to a method for preparing lithium iron phosphate composite cathode materials. Background technique [0002] Lithium-ion battery is a commercial battery developed in the last two decades. Because of its high energy density, long cycle life, light weight, small size, and good safety, it has gradually replaced traditional lead-acid batteries, Ni-MH batteries are widely used as power sources for communication equipment such as portable electronic appliances, digital cameras, notebook computers, and mobile phones. Among all commercial rechargeable batteries, the reason why lithium batteries have outstanding energy advantages and high voltage is mainly due to the negative electrode material (LiC 6 / C) The advantages of low potential and high capacity. Therefore, the choice of cathode material has become the key to improving the overall performance of lithium-ion batteries. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 夏圣安李新宏
Owner CHANGZHOU HECO NEW ENERGY TECH CO LTD
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