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Low-temperature oxidation curing process of secondary particles

A technology of secondary granulation and curing process, which is applied in the granulation of special adhesives, the method of granulating raw materials, and the granulation in static tanks/tanks, etc. It can solve problems such as difficulty in meeting application requirements and achieve excellent curing effect. , the effect of low energy consumption and short reaction period

Active Publication Date: 2020-08-04
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, for the secondary particles that still need to be mechanically processed or high-temperature heat treated in the later stage of composite granulation, the traditional heating and curing technology is difficult to meet the application requirements

Method used

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  • Low-temperature oxidation curing process of secondary particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Feed the secondary particles ① into the cooling kettle. The cooling kettle maintains a nitrogen atmosphere, the stirring speed is 50rpm, the cooling method is cooling by circulating heat transfer oil, and the cooling speed is 120°C / min.

[0033] When the indicated temperature of the material drops to 320°C, close the feed valve and discharge valve of the circulating oil in turn; keep the cooling rate at 30°C / min, and when the temperature drops to 250°C, close the nitrogen inlet valve and open the oxygen inlet valve ; After the material is cooled to room temperature, the 1# sample can be obtained.

Embodiment 2

[0035] Feed the secondary particles ① into the cooling kettle. The cooling kettle maintains an argon atmosphere, the stirring speed is 60rpm, the cooling method is cooling by circulating heat transfer oil, and the cooling speed is 250°C / min.

[0036] When the indicated temperature of the material drops to 320°C, close the feed valve and discharge valve of the circulating oil in turn; keep the cooling rate at 30°C / min, and when the temperature drops to 250°C, close the nitrogen inlet valve and open the oxygen inlet valve ; When the material is cooled to room temperature, the 2# sample can be obtained.

Embodiment 3

[0038] Feed the secondary particles ② into the cooling kettle. The cooling kettle maintains a nitrogen atmosphere, the stirring speed is 70rpm, the cooling method is cooling by circulating heat transfer oil, and the cooling speed is 140°C / min.

[0039] When the indicated temperature of the material drops to 320°C, close the feed valve and discharge valve of the circulating oil in turn; keep the cooling rate at 30°C / min, and when the temperature drops to 250°C, close the nitrogen inlet valve and open the oxygen inlet valve ; When the material is cooled to room temperature, the 3# sample can be obtained.

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Abstract

The invention discloses a low-temperature oxidation curing process for secondary particles. The process is as follows: transferring a secondary particle hot material which is just granulated into a cooling kettle under the protection of inert atmosphere from a high-temperature kettle, cooling the secondary particle hot material by adopting circulating heat-conducting oil, and closing the circulating heat-conducting oil when the temperature is reduced to 320-270 DEG C so as to naturally cool the secondary particle hot material; when the secondary particle hot material is cooled to 250 DEG C, changing the inert atmosphere into the oxygen atmosphere, performing oxidation curing treatment on the secondary particle hot material, and when the temperature is reduced to the room temperature, performing discharging. The process has the advantages of simple process, low energy consumption, environmental protection, strong toughness of cured secondary particles and high mechanical strength.

Description

technical field [0001] The invention relates to a granulation technology for negative electrode materials of lithium ion batteries, in particular to a low-temperature solidification technology for secondary particles used for negative electrode materials of lithium ion batteries. Background technique [0002] Granulation technology is a type of powder processing technology that has developed rapidly in recent years. It refers to a process of compounding single particles into secondary particles under the action of binders. It has been widely used in many fields. [0003] The granulation process can be roughly divided into three steps: mixing, granulation, and solidification. Among them, mixing is to mix the single particle with the adhesive evenly; granulation is to melt the adhesive into a liquid state at high temperature and bond the single particle into secondary particles; curing refers to curing the adhesive to ensure It no longer plastically deforms or liquefies at hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J2/00B01J2/10B01J2/28
CPCB01J2/00B01J2/10B01J2/28
Inventor 石磊皮涛徐燕宁舒平邵浩明
Owner HUNAN SHINZOOM TECH
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