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Lithium ion battery anode material and preparation method

A lithium-ion battery and cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor particle fluidity of battery cathode materials, reduce the stability of battery cathode materials, affect processing performance, etc., to improve cycle performance and The effect of high temperature performance, low cost and low production cost

Active Publication Date: 2015-04-08
山东天骄新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the secondary particles of spinel lithium manganese oxide are made spherical, but the primary particles are sharp-edged. These corners increase the specific surface area, increase the contact area between the positive electrode material of the battery and the electrolyte, and accelerate the process of the positive electrode of the battery. The reaction between the material and the electrolyte, thus reducing the stability of the battery positive electrode material; and these corners make the fluidity of the battery positive electrode material particles poorer, affecting the processing performance

Method used

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  • Lithium ion battery anode material and preparation method
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  • Lithium ion battery anode material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) 200kg of manganese tetraoxide, 51.46kg of battery-grade lithium carbonate, and 0.88kg of niobium pentoxide were ball milled in a ball mill for 3 hours, and the ball milling medium was zirconium balls until the average particle size of the ball mill was 5 μm;

[0036] (2) Put the obtained ball abrasive in a sagger, sinter it in a roller kiln, heat it in an air atmosphere at a heating rate of 2°C / min, keep it at 700°C for 10 hours, continue to heat it up to 900°C and keep it for 10 hours, then Furnace cooling to obtain agglomerated sintered material;

[0037] (3) After the sintered material is cooled, it is pulverized in a pulverizer until the median particle size is 12-15 μm. After mixing the sintered material, it is kept at 750°C for 8 hours to obtain the single-particle spherical lithium manganate target product.

Embodiment 2

[0039] (1), 200kg manganese tetraoxide, 55.49kg battery grade lithium carbonate (Li 2 CO 3 ), 1.81kg niobium pentoxide (Nb 2 o 5 ) in a ball mill for 4 hours, using zirconium balls as the ball milling medium, until the average particle size of the ball mill is 3 μm;

[0040] (2) Put the obtained ball abrasive in a sagger, sinter in a roller kiln, heat at a heating rate of 8°C / min in an air atmosphere, keep at 650°C for 8 hours, continue to heat up to 850°C for 12 hours, and then Furnace cooling to obtain agglomerated sintered material;

[0041] (3) After the sintered material is cooled, it is pulverized in a pulverizer until the median particle size is 4-6 μm. After mixing the sintered material, it is kept at 650°C for 10 hours to obtain the single-particle spherical lithium manganate target product.

Embodiment 3

[0043] (1), 200kg manganese tetraoxide, 56.26kg battery grade lithium carbonate (Li 2 CO 3 ), 1.87kg niobium pentoxide (Nb 2 o 5 ) and 8.79kg aluminum hydroxide (Al(OH) 3 ) in a ball mill for 2 hours, using zirconium balls as the ball milling medium, until the average particle size of the ball mill is 10 μm;

[0044] (2) Put the obtained ball abrasive in a sagger, sinter in a roller kiln, heat at a heating rate of 15°C / min in an air atmosphere, keep at 750°C for 7 hours, continue to heat up to 950°C for 7 hours, and then Furnace cooling to obtain agglomerated sintered material;

[0045] (3) After the sintered material is cooled, it is pulverized in a pulverizer until the median particle size is 6-8 μm. After mixing the sintered material, it is kept at 750°C for 8 hours to obtain the single-particle spherical lithium manganate target product.

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Abstract

The invention discloses a lithium ion battery anode material and a preparation method, and belongs to the technical field of energy materials. The lithium ion battery anode material is mainly composed of a lithium ion battery anode material precursor and a lithium source. The lithium ion battery anode material is characterized by further comprising a flux which is niobium pentoxide or niobium hydroxide. The flux can effectively reduce the melting point of spinel lithium manganese oxide, melt surfaces of particles at a proper temperature, and remove corner angles of particles, so that the particles are made into a spherical-like shape; the surfaces of the particles have no corner angles and approximate a sphere shape, the specific surface area is large, and processability and structural stability of materials are greatly improved.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method, belonging to the technical field of energy materials. Background technique [0002] Lithium-ion batteries have the characteristics of high voltage, no memory effect, high energy density and good cycle performance, and have been widely used in portable appliances. Lithium manganese oxide is one of the more promising lithium ion cathode materials. Compared with traditional cathode materials such as lithium cobalt oxide, lithium manganate has the advantages of abundant resources, low cost, no pollution, good safety, and good rate performance. It is an ideal However, its poor cycle performance and electrochemical stability greatly limit its industrialization. Lithium manganate mainly includes spinel-type lithium manganate and layered structure lithium manganate, among which spinel-type lithium manganate has a stable structure and is easy to realize industrial product...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505C01G45/12
CPCY02E60/122Y02E60/10
Inventor 郝伟石迪辉
Owner 山东天骄新能源有限公司