Preparation method of lithium iron phosphate-based modified positive electrode 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 stacking density of lithium iron phosphate materials, and achieve improved electrochemical performance, increased conductivity, and reduced resistance Effect

Active Publication Date: 2018-10-19
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
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  • 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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  • Preparation method of lithium iron phosphate-based modified positive electrode material

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Embodiment 1

[0023] A method for preparing a lithium iron phosphate-based modified cathode material, comprising the following steps:

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

[0025] (2) Graphene and carbon nanotubes with a mass ratio of 2:1 were put into distilled water, and after being preliminarily pulverized by ultrasonic waves, they were mixed and stirred at room temperature for 4 to 6 minutes, and then 2 to 4 Raise the temperature to 40-60°C at a rate of ℃ / min, keep it warm for 4-6 hours, and then naturally cool to room temperature to obtain the 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 For ...

Embodiment 2

[0034] The content of this embodiment is basically the same as that of Example 1, and the similarities will not be repeated. The difference is that in the step (3), the mixed solution A and the mixed solution B are mixed and stirred at a volume ratio of 2:1. , to obtain a zirconium-doped carbon material precursor, and dry the zirconium-doped carbon material precursor through a closed cycle spray dryer, the inlet temperature and outlet temperature of the closed cycle spray dryer are 800-960 °C and 70-60°C, the rotation speed of the atomizer of the closed-cycle spray dryer is 24000-26000r / min, and the zirconium-doped carbon material is formed.

Embodiment 3

[0036] The content of this embodiment is basically the same as that of Example 1, and the similarities will not be repeated. The difference is that in the step (3), the mixed solution A and the mixed solution B are mixed and stirred at a volume ratio of 1.5:1. , to obtain a zirconium-doped carbon material precursor, and dry the zirconium-doped carbon material precursor through a closed cycle spray dryer, the inlet temperature and outlet temperature of the closed cycle spray dryer are 800-960 °C and 70-60°C, the rotation speed of the atomizer of the closed-cycle spray dryer is 24000-26000r / min, and the zirconium-doped carbon material is formed.

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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 preparation method of a lithium iron phosphate-based modified cathode 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. Lithium-ion batteries are different from lithium-ion polymer batteries. 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 20th century, miniaturized equipment is increasing day by day, which puts forward high requirements for power supply. Lithium batte...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCH01M4/366H01M4/5825H01M4/583H01M10/0525Y02E60/10
Inventor 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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