Low temperature oxidation curing process of secondary particles

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...

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