A kind of preparation method of modified lithium iron phosphate cathode material for lithium battery

A lithium iron phosphate and cathode material technology, which is applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problems of reducing the packing density of lithium iron phosphate materials, and achieve good lithium ion conduction characteristics. , good ionic conductivity, the effect of improving electronic conductivity

Active Publication Date: 2021-02-05
信丰永冠塑电科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbon added in the general process is loose in texture and loosely distributed among the lithium iron phosphate particles, which seriously reduces the packing density of the lithium iron phosphate material.

Method used

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  • A kind of preparation method of modified lithium iron phosphate cathode material for lithium battery

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Embodiment 1

[0024]A preparation method of a modified lithium iron phosphate cathode material for lithium batteries includes the following steps:

[0025](1) Put the graphene and carbon nanotubes with a mass ratio of 1:1 into the solvent, and after the preliminary ultrasonic pulverization treatment, mix and stir at room temperature for 4-6 minutes, and then use 2 to 4 The temperature is increased to 40~60℃ at a rate of ℃ / min, and then kept for 4~6h, and then cooled to room temperature naturally to obtain a mixed solution;

[0026](2) Crush the lithium iron phosphate to a particle size of 3-6um, and put the lithium iron phosphate into the stirred tank. Slowly add distilled water according to the mass ratio of lithium iron phosphate and distilled water=1:2~7, and add even After the coupling agent and the conductive agent are quickly stirred for 10-16 minutes, the mixed solution in step (1) is added to the stirring tank and stirred evenly to obtain the modified intermediate;

[0027](3) Add the modified int...

Embodiment 2

[0032]The content of this embodiment is basically the same as that of embodiment 1, and the similarities will not be repeated. The difference is that the step (1) puts graphene and carbon nanotubes in a solvent with a mass ratio of 2:1 and passes After the initial ultrasonic pulverization treatment, mix and stir at room temperature for 4-6 minutes, then heat up to 40-60℃ at a rate of 2-4℃ / min under the protection of inert gas, keep it for 4-6h, and then cool to At room temperature, a mixed solution is obtained;

Embodiment 3

[0034]The content of this embodiment is basically the same as that of embodiment 1, and the similarities will not be repeated. The difference is that the step (1) puts graphene and carbon nanotubes with a mass ratio of 1.5:1 into the solvent and passes After the initial ultrasonic pulverization treatment, mix and stir at room temperature for 4-6 minutes, then heat up to 40-60℃ at a rate of 2-4℃ / min under the protection of inert gas, keep it for 4-6h, and then cool to At room temperature, a mixed solution is obtained.

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Abstract

The invention relates to the technical field of lithium ion battery electrode materials, in particular to a method for preparing a modified lithium iron phosphate positive electrode material for lithium batteries, which comprises adding graphene and carbon nanotubes into a solvent in a mass ratio of (1-2):1 , and preliminarily crushed by ultrasonic, mixed and stirred at room temperature for 4 to 6 minutes, and then heated to 40 to 60 °C at a rate of 2 to 4 °C / min under the protection of inert gas, and then kept for 4 to 6 hours. Naturally cooled to room temperature to obtain a mixed solution. In this way, in the present application, by using carbon nanotubes and graphene as modification additives, a structure in which the lithium iron phosphate positive electrode material is inside and the amorphous carbon is covered outside is formed. Lithium iron phosphate will form lithium-rich compounds during the discharge process, which have good ionic conductivity. At the same time, these lithium-rich compounds can modify the surface structure of lithium phosphate, thereby improving the electronic conductivity of the surface of lithium phosphate.

Description

Technical field:[0001]The invention relates to the technical field of lithium ion battery electrode materials, in particular to a method for preparing a modified lithium iron phosphate cathode material for lithium batteries.Background technique:[0002]A lithium battery is a primary battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. It is different from a rechargeable battery, a lithium ion battery, and a lithium ion polymer battery. The inventor of the lithium battery is Edison. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of microelectronics technology at the end of the twentieth century, more and more miniaturized devices have placed high demands on power supplies. Lithium batteries have subsequently entered a larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 丘焕山
Owner 信丰永冠塑电科技有限公司
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