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A kind of crystallization method prepares the method for lithium carbonate nanoparticle

A nanoparticle, lithium carbonate technology, applied in nanotechnology, lithium carbonate;/acid carbonate, etc., can solve the problems of complex system, low purity, high cost, and achieve good repeatability and stability, and the reaction small size and mild operating conditions

Active Publication Date: 2011-12-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this type of method is that lithium hydroxide itself needs to be electrolytically produced with lithium carbonate as a raw material, the cost is relatively high, and the purity is lower than that of lithium carbonate; the addition of additives leads to a complicated system, which not only increases the cost, but also affects the purity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A microstructured reactor using a microporous membrane with a pore size of 5 microns as the dispersion medium. Prepare 1 L of an ethanol aqueous solution with an ethanol mass fraction of 0.1, add 5 g of lithium carbonate and fully dissolve it to obtain raw material A, and put it into a storage container. Raw material B is absolute ethanol. Feed the raw material A into the microstructure reactor at a flow rate of 25mL / min from the storage container, and feed the raw material B into the microstructure reactor at a flow rate of 25mL / min. The raw materials A and B are mixed in the microstructure reactor, and the reactor outlet materials After solid-liquid separation, the obtained solid phase is washed with pure water, dried and ground to obtain final lithium carbonate particles with an average particle size of 80 nm. All the above operations were completed at 40°C.

Embodiment 2

[0020] A micro-structured reactor using a micro-sieve plate with a pore size of 1000 microns as the dispersion medium. Prepare 100L of ethanol aqueous solution with ethanol mass fraction of 0.04, add excess lithium carbonate to it to fully dissolve it, and then solid-liquid separation to obtain a saturated lithium carbonate solution as raw material A. Raw material B is an ethanol aqueous solution with an ethanol mass fraction of 0.7. Feed material A into the microstructure reactor at a flow rate of 500mL / min from the storage container, feed material B into the microstructure reactor at a flow rate of 4500L / min, mix raw material A and material B in the microstructure reactor, and the reactor outlet material After solid-liquid separation, the obtained solid phase is washed with pure water, dried and ground to obtain final lithium carbonate particles with an average particle size of 60 nm. All the above operations were completed at 20°C.

Embodiment 3

[0022] A microstructured reactor using a 200 micrometer pore size as a dispersion medium. Fully dissolve 1000 g of lithium carbonate into 100 L of water to obtain raw material A. Raw material B is an ethanol aqueous solution with an ethanol mass fraction of 0.9. Under the condition of sufficient stirring, feed material A into the microstructure reactor at a flow rate of 500mL / min from the storage container, feed material B into the microstructure reactor at a flow rate of 1500mL / min, and feed material A and material B in the microstructure reactor After mixing, the material at the outlet of the reactor is separated into solid and liquid, and the obtained solid phase is washed with pure water, dried and ground to obtain final lithium carbonate particles with an average particle size of 40 nm. All the above operations were completed at 60°C.

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PUM

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Abstract

The invention discloses a method for preparing lithium carbonate nano-particles by a crystallization method, which belongs to the technical field of chemistry and chemical engineering. The method comprises the following steps: dissolving lithium carbonate in water or an ethanol aqueous solution to obtain a raw material A, wherein ethanol of an ethanol aqueous solution is used as a raw material B,introducing the raw material A and the raw material B into a microstructure reactor, rapidly mixing the raw material A and the raw material B in the microstructure reactor at 20 DEG C to 60 DEG C, precipitating lithium carbonate, performing solid-liquid separation, drying and grinding of the materials at an outlet of the reactor so as to obtain the nanometer lithium carbonate particles. The lithium carbonate nano-particles prepared by the invention is obtained by using cheap and easily available lithium carbonate raw materials; the operation condition is mild without the addition of auxiliaryagents; the volume of the reactor required is small; the product obtained has good repeatability and stability; the particle size is below 100 nm, and the distribution is narrow.

Description

Technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and particularly relates to a method for preparing lithium carbonate nanoparticles by a crystallization method. Background technique [0002] Lithium carbonate is one of the most widespread forms of lithium resources in nature, and it is also the main intermediate product of the brine extraction process. Lithium carbonate powder is the basic raw material for manufacturing lithium ion batteries. Adding lithium carbonate as an electrolyte additive to the battery can improve the film-forming performance of the battery, thereby improving the battery's cycle performance and low-temperature discharge performance. Using lithium carbonate powder as one of the raw materials, a solid phase synthesis method can be used to obtain lithium iron phosphate as a positive electrode material for lithium ion batteries. As a powder material, the application performance of lithium carbonate has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08B82Y40/00
Inventor 吕阳成骆广生刘洋
Owner TSINGHUA UNIV