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Lithium ion anode and cathode materials atmosphere immersive sintering process and related sintering device

A technology of sintering equipment, positive and negative electrodes, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of reducing the protective effect of the atmosphere or the reactivity, poor material quality and stability, and large differences between the upper and lower surfaces. Changes in temperature gradient, which are beneficial to anti-suck back and increase the effect of air tightness

Active Publication Date: 2016-04-20
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This design can maintain a stable temperature within a certain range, but it cannot meet the requirements of another important factor for sintering - the atmosphere
When gas is used as a reaction raw material to synthesize various lithium ion positive and negative electrode materials, it is often only possible to "fly around" on the surface of the material, and cannot fully contact the particles of the material, which makes the difference between the upper and lower surfaces of the current conventional lithium ion positive and negative electrode materials after sintering , The material quality and stability are poor; for example: the nitrogen atmosphere in the sintering process of lithium iron phosphate material affects the content of ferric iron impurities in the product, and the oxygen atmosphere in the sintering synthesis of nickel cobalt lithium manganese oxide material determines the valence state stability of the finished material and many more
In addition, during the sintering process, powder materials are mostly loaded in crucibles, porcelain boats and other vessels. Regardless of the size of such vessels, there are usually walls of a certain height, which hinders the contact area between the atmosphere and the powder materials and reduces the The protective effect or reactivity of the atmosphere is reduced; it seriously restricts the stability of material quality and the improvement of output, so it is particularly important to explore a process technology that can realize the synthesis of lithium-ion positive and negative electrode materials with the atmosphere "soaked" contact sintering

Method used

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  • Lithium ion anode and cathode materials atmosphere immersive sintering process and related sintering device
  • Lithium ion anode and cathode materials atmosphere immersive sintering process and related sintering device
  • Lithium ion anode and cathode materials atmosphere immersive sintering process and related sintering device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Immersion sintering of nickel cobalt lithium manganese oxide material under oxygen atmosphere:

[0032] Add the precursor mixture of nickel hydroxide, cobalt manganese and lithium carbonate materials into the spheroidizer, granulate into balls, and then screen with a screen of 100-200 to obtain the particle precursor material with good consistency. Finally, the product precursor mixture will be obtained. Open the immersion sintering furnace, the upper part of the sintering furnace is a spherical cavity with a radius of 18cm, and the lower part is a spherical cavity with a radius of 21cm; The mixture of nickel hydroxide, cobalt, manganese and lithium carbonate, which is a lithium manganate material, is spread on the expansion plate with alternating concave and convex, so that the thickness of the material is controlled uniformly, and the surface of the material is equal to the upper surface of the ventilation tower;

[0033] The upper and lower symmetrical expansion pane...

Embodiment 2

[0037] Immersion sintering of lithium iron phosphate material under nitrogen atmosphere:

[0038] Add the precursor mixture of iron phosphate and lithium carbonate materials into the spheroidizer, granulate into balls, and then use the sieve 100-200 to screen to obtain the particle precursor material with good consistency, and finally obtain the product precursor mixture, soak the gas powder Open the type sintering furnace, the upper part of the sintering furnace is a spherical cavity with a radius of 18cm, and the lower part is a spherical cavity with a radius of 21cm; take out the upper and lower symmetrical expansion panels, remove the upper expansion panel, and place the lithium iron phosphate The material is a mixture of iron phosphate, glucose and lithium carbonate, which is laid flat on the expanding plate with alternating concave and convex, so that the thickness of the material is controlled uniformly, and the surface of the material is equal to the upper surface of th...

Embodiment 3

[0043] Immersion sintering of carbon-coated lithium titanate anode material under nitrogen atmosphere:

[0044] Add the precursor mixture of titanium dioxide and lithium carbonate materials into the spheroidizer, granulate into balls, and then use a screen of 100-200 to screen to obtain the particle precursor material with good consistency. Finally, the product precursor mixture will be obtained, and the gas powder soaked The sintering furnace is opened, the upper part of the sintering furnace is a spherical cavity with a radius of 18cm, and the lower part is a spherical cavity with a radius of 21cm; take out the upper and lower symmetrical expansion panels, remove the upper expansion panel, and put the raw material of the negative electrode material The mixture of lithium carbonate and titanium dioxide is laid flat on the expanding plate with alternating concave and convex, so that the thickness of the material is controlled to be uniform, and the surface of the material is eq...

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Abstract

The invention discloses a technique process and an operation method for realizing immersive sintering of lithium ion anode and cathode materials with reaction atmosphere or reaction gas. The sintering process is suitable for a synthetic reaction under specific atmosphere, an oxidizing reaction requiring an oxygen atmosphere, a carbon cladding reaction under organic gas, and a quenching reaction requiring fast cooling of cooling gas; the defect that conventional sintering gas floats at the surface of the material is solved by whole course gas immersive sintering manner, thus greatly improving the reaction activity when the gas serves as a reaction raw material and inertia protection when the gas serves as a protection atmosphere, being favorable for meeting the preparing of lithium battery anode and cathode materials requiring the gas to participate the reaction or provide the protection atmosphere, and realizing the immersive sintering process under the gas atmosphere by particle size screening after precursor pelleting, oppositely buckling upper and lower symmetric expanded panels of an immersive sintering furnace and a smart design of the expanded panel and a venting tower.

Description

technical field [0001] The invention relates to an atmosphere soaking sintering process for lithium ion positive and negative electrode materials and related sintering equipment. Background technique [0002] With the popularization of new energy vehicles and various vehicles, new energy lithium batteries are widely used, and the synthesis and quality assurance of lithium ion battery positive and negative materials are particularly important; lithium ion positive and negative materials belong to powder materials. High-temperature sintering is a common process for material synthesis. High-temperature sintering is beneficial to the formation of crystal states of various materials and the growth and control of grains. Therefore, sintering furnaces are widely used in various fields of new energy material processing and synthesis. [0003] The sintering process is mostly to heat the mixed powder or solid material in an appropriate environment or atmosphere, through a series of ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 关成善宗继月孟博杜显振
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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