Method for synthesizing lithium ion cell positive cell polar material rotary furnace

Abstract

The method includes steps: (1) loading hydrate, oxide of lithium or mixed salt with hydrate, oxide or salt of transition metal into revolving furnace; (2) controlling temperature inside revolving furnace at 600 - 950 deg.C and rotation speed at 2 - 5 turns / minute, calcining admixture in revolving furnace for 20 - 40 hours, and then cooling it; (3) anode material of lithium battery is obtained through steps of crushing and sieving cooled materiel. Since calcined materiel is heated evenly inside revolving furnace, thus, physical and chemical characters of obtained materiel are even features are: shortened time for processing in high temperature, and lowered energy consumption.

Description

technical field [0001] The invention belongs to battery technology, in particular to a method for synthesizing positive electrode materials of lithium-ion batteries by calcining in a rotary furnace. Background technique [0002] At present, the synthesis process of lithium-ion battery cathode materials such as lithium cobaltate, lithium manganate, lithium nickelate, lithium ferrous phosphate, lithium vanadate, etc. needs to go through a high-temperature calcination step. Usually, the equipment used in this step is a traditional high-temperature furnace. , such as muffle furnace, tunnel kiln. The specific operation is to mix the lithium salt and other metal salts evenly in a certain proportion, put them into a high-temperature-resistant container (such as a crucible), and place them in a high-temperature furnace for calcination for a period of time. Commonly used lithium salts include lithium carbonate, lithium hydroxide, lithium nitrate, lithium acetate, etc., and others ar...

AI Technical Summary

Problems solved by technology

The heating source is generally fixed inside the furnace body. For containers containing different materials, the heating conditions of each container containing materials at different positions in the same temperature zone in the high-temperature furnace are limited by the manufacturing accuracy and temperature control accuracy of the high-temperature furnace itself. Can not be consistent; for the same container, because the material in the container is in a static state, it is difficult to be consistent with the heating of the material at the peripheral position and the central position, the surface layer position and the internal position, which will cause the physical and chemical properties of the positive electrode material after calcination uneven

[0005] (2) Low thermal efficiency and large energy waste

[0006] In order to ensure that the materials in different containers and materials in different positions in the same container are heated evenly and fully, it is necessary to prolong the high temperature treatment time, so the energy consumption is large

[0007] In addition, traditional high-temperature furnaces such as muffle furnaces and tunnel kilns are poorly sealed, and the heat loss caused by heat dissipation is relatively large, so the thermal efficiency is low and energy waste is large

[0008] (3) The consumption of consumables is large and the production cost is high

[0009] Containers (such as crucibles) containing materials are easily broken or even completely damaged after repeated high-temperature calcinations, and need to be replaced continuously, resulting in increased production costs

[0010] (4) There is a lot of material waste and pollution

[0011] In large-scale production, before and after high-temperature treatment, it is necessary to continuously move materials into and out of a large number of high-temperature-resistant containers (such as crucibles), and this transfer process causes a lot of material waste and dust pollution.

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