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Low-temperature granulation method of lithium ion battery negative electrode material

A lithium-ion battery and negative electrode material technology, applied in the direction of granulating raw materials, battery electrodes, secondary batteries, etc., can solve problems such as consuming large heat energy, affecting material granulation effect, environmental protection pressure, etc., to reduce heat energy consumption , good curing effect, the effect of reducing pollution

Inactive Publication Date: 2020-09-04
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to ensure that the materials obtained by composite granulation maintain good mechanical properties during the graphitization process (at 3000°C) or during mechanical processing (classification, screening, etc.), enterprises generally use pitch with high carbon residue as the binder at present. However, , Asphalt can only be solidified when it is heat-treated at 500°C and above. Therefore, the traditional negative electrode material granulation technology must be carried out at a higher temperature, which will consume a lot of heat energy on the one hand. On the other hand, during the composite granulation process, A large amount of asphalt volatiles will overflow, which not only brings pressure on the environmental protection of the enterprise, but more seriously, a part of the volatiles will stick to the inner wall of the reactor, affecting the granulation effect of the next batch of materials

Method used

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  • Low-temperature granulation method of lithium ion battery negative electrode material

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Experimental program
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Effect test

Embodiment 1

[0022] Process low-temperature plastic asphalt with a softening point below 150°C and an ash content below 0.1% into a low-temperature asphalt powder of 3-5 μm, and then mix the low-temperature asphalt powder and graphite single particles at a ratio of 1:9, and the stirring speed is 200rpm , mixed for 30min. Then put the mixed material into the reactor, under the nitrogen atmosphere, the temperature of the reactor is 200°C, the rotation speed is 30rpm, after the heat preservation for 1h, the air is replaced, and after keeping for 30min, the material is transferred to the cooling tank, and the material is discharged after reaching room temperature. The obtained material is marked as 1#.

Embodiment 2

[0024] Mix the modified pitch and graphite at a ratio of 15:85, and mix for 30 minutes at a stirring speed of 200 rpm. Then put the mixed material into the reaction kettle, under the argon atmosphere, the temperature of the reaction kettle is 200°C, the rotation speed is 30rpm, after the heat preservation for 1h, the air is replaced, and after keeping for 30min, the material is transferred to the cooling kettle, and the material is discharged after reaching room temperature, and the obtained material is marked It is 2#.

Embodiment 3

[0026] Mix the modified pitch and graphite at a ratio of 1:4, and mix for 30 minutes at a stirring speed of 200 rpm. Then put the mixed material into the reactor, under the nitrogen atmosphere, the temperature of the reactor is 200°C, the rotation speed is 30rpm, after the heat preservation for 1h, the air is replaced, and after keeping for 30min, the material is transferred to the cooling tank, and the material is discharged after reaching room temperature. The obtained material is marked as 3#.

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Abstract

The invention provides a low-temperature granulation method of a lithium ion battery negative electrode material. The low-temperature granulation method comprises the following steps: processing low-temperature plastic asphalt into low-temperature asphalt powder, and mixing the low-temperature asphalt powder with graphite single particles VC for 30-60 minutes at a mixing speed of 200-300 rpm to form a mixture; and putting the mixture into a reaction kettle, controlling the temperature of the reaction kettle to be 200-300 DEG C in an inert atmosphere, carrying out heat preservation for 1-3 hours, then changing the inert atmosphere in the reaction kettle into an air atmosphere, and continuously carrying out heat preservation for 30-60 minutes to obtain the lithium ion battery negative electrode material subjected to low-temperature secondary granulation. The method disclosed by the invention has the characteristics of low pollution and low energy consumption, and the obtained secondary particles are good in toughness and high in mechanical strength.

Description

technical field [0001] The invention relates to a powder composite granulation process for lithium-ion battery negative electrode materials, in particular to a low-temperature composite granulation process for lithium-ion battery negative electrode materials. Background technique [0002] Composite granulation process is one of the commonly used preparation processes for negative electrode materials of lithium-ion batteries at present. It is to make single particles of various coke powders or graphite powders into secondary particles with a specific degree of compounding through the action of binders. Technology. Through the application of composite granulation technology, the electrochemical performance of negative electrode materials can be comprehensively improved. [0003] In order to ensure that the materials obtained by composite granulation maintain good mechanical properties during the graphitization process (at 3000°C) or during mechanical processing (classificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/62H01M10/0525C01B32/205B01J2/00
CPCB01J2/00C01B32/205H01M4/587H01M4/621H01M10/0525Y02E60/10
Inventor 石磊皮涛徐燕宁舒平邵浩明
Owner HUNAN SHINZOOM TECH