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A kind of preparation method of lithium iron phosphate base modified cathode material

A technology of lithium iron phosphate and positive electrode materials, which is applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of reducing the packing density of lithium iron phosphate materials, and achieve the goals of improving electrochemical performance, reducing resistance, and increasing migration speed Effect

Active Publication Date: 2020-08-25
漳州雷天温斯顿动力电池研发中心有限公司
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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 lithium iron phosphate base modified cathode material

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Embodiment 1

[0023] A preparation method of lithium iron phosphate-based modified cathode material includes the following steps:

[0024] (1) Put the compound of the zirconium source into distilled water and pulverize it to a particle size of 2-12um by a ball mill, then mix and stir at room temperature for 4-6 minutes to obtain a mixed solution A;

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

[0026] (3) Mix and stir the mixed solution A and the mixed solution B at a volume ratio of 1:1 to obtain a zirconium-doped carbon material precursor, and pass the zirconium-doped carbon material precursor through a closed-cycle spray dryer Fo...

Embodiment 2

[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: the step (3) mix and stir the mixed liquid A and the mixed liquid B at a volume ratio of 2:1 , The zirconium-doped carbon material precursor is obtained, and the zirconium-doped carbon material precursor is dried by a closed-loop spray dryer. The inlet temperature and outlet temperature of the closed-loop spray dryer are 800-960℃ and 70~60℃, the rotating speed of the atomizer of the closed-circulation spray dryer is 24000~26000r / min, forming the zirconium-doped carbon material.

Embodiment 3

[0036] The content of this embodiment is basically the same as that of embodiment 1, and the similarities will not be repeated. The difference is: the step (3) mix and stir the mixed liquid A and the mixed liquid B at a volume ratio of 1.5:1 , The zirconium-doped carbon material precursor is obtained, and the zirconium-doped carbon material precursor is dried by a closed-loop spray dryer. The inlet temperature and outlet temperature of the closed-loop spray dryer are 800-960℃ and 70~60℃, the rotating speed of the atomizer of the closed-circulation spray dryer is 24000~26000r / min, forming the zirconium-doped carbon material.

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Abstract

The invention relates to the technical field of a lithium ion battery electrode material, in particular to a preparation method of a lithium iron phosphate-based modified positive electrode material.The method comprises the following steps of putting a zirconium source compound into distilled water; performing crushing treatment through a ball milling machine until the particle diameter is 2 to 12 mu m; therefore firstly performing modification treatment on graphene and carbon nanometer tubes; then, bonding zirconium in the zirconium source compound with the carbon; after the heat treatment,introducing the zirconium onto the surface of the graphene to obtain zirconium doped carbon materials; then, modifying the lithium iron phosphate by the zirconium doped carbon materials to make the partial zirconium dope into the lithium iron phosphate. The conductivity between the lithium iron phosphate particles is enhanced; the compatibility of the material surface and electrolyte is improved;the resistance received during the lithium ion migration is reduced; the electrochemical performance of the battery in low-temperature environment can be further improved.

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 lithium iron phosphate-based modified positive electrode material. 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 entere...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCH01M4/366H01M4/5825H01M4/583H01M10/0525Y02E60/10
Inventor 钟馨稼钟旭航丘焕山
Owner 漳州雷天温斯顿动力电池研发中心有限公司
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