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, granulation in static tanks/troughs, and the method of granulating raw materials. It can solve problems such as difficult to meet application requirements and achieve excellent curing effects. , high mechanical strength and strong toughness

Active Publication Date: 2022-02-22
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 oxidative solidification process of secondary particles, which transfers the hot material of the secondary particles which has just completed the granulation process from a high-temperature kettle into a cooling kettle under the protection of an inert atmosphere, and uses circulating heat conduction oil to heat the secondary particles. Cool the material, and when the temperature drops to 320~270°C, turn off the circulating heat conduction oil to let the secondary particle heat material cool down naturally; when the temperature of the secondary particle heat material cools down to 250°C, change the inert atmosphere to an oxygen atmosphere. The secondary particle hot material is oxidized and cured, and the material can be unloaded when the temperature drops to room temperature. The invention has the advantages of simple process, low energy consumption, environmental protection, strong toughness and high mechanical strength after the secondary particles are cured.

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 Patents(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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