Method for preparing high-purity lithium carbonate

Abstract

The invention belongs to the technical field of preparation of nanoscale lithium salt and particularly discloses a method for preparing high-purity lithium carbonate. The method includes the steps that firstly, pure water is heated to 60-80 DEG C, the pure water and lithium hydroxide monohydrate are mixed with the mass ratio being two to one, then, a small amount of water-soluble dispersant is added into the mixture and is sufficiently stirred, and the mixture serves as a lithium source; secondly, percarbamide and pure water are mixed in equal mass to serve as a carbonic acid source, and the molar ratio of the percarbamide to the lithium hydroxide monohydrate is 1:1.80-1.95; thirdly, the lithium source and the carbonic acid source are added into a hydro-thermal synthesis reaction still and are sufficiently stirred, then, the still is closed and placed in a drying oven, the still is heated to 100 DEG C-120 DEG C at the speed of 3 DEG C / min and is taken out after being contained for 5-10 h, lithium carbonate size in the still is filtered to obtain a filter cake, the hot filter cake is washed for 2-4 times through boiling pure, and then wet materials are obtained; fourthly, the wet materials are dried for 8-15 h at the temperature being 250 DEG C-350 DEG C, the pressure being -0.1 Mpa- -0.08 Mpa, and finally lithium carbonate powder with the particle diameter being 20-90 nm is obtained.

Description

technical field

[0001] The invention relates to the technical field of preparation of nanoscale lithium salts, in particular to a preparation method of nanoscale high-purity lithium carbonate. Background technique

[0002] Lithium-ion batteries have high capacity, high voltage, low energy consumption, no memory effect, no pollution, and small size. It is widely used in electronic products such as mobile phones, PDAs, notebook computers, portable CDs, etc., and is gradually expanding to the fields of electric vehicles, space technology, and national defense industry. It is the most concerned product nowadays. One of the new batteries. Lithium-ion batteries are composed of negative electrode materials, positive electrode materials, and electrolytes. However, the existing electrode and electrolyte materials have reached the limit of performance. The development of a new generation of lithium-ion batteries urgently needs a breakthrough in material technology. Studies have show...

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