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In-situ preparation method of lithium carbonate

A technology of in-situ preparation and lithium carbonate, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems such as the decrease of the purity of lithium carbonate and the complicated process

Inactive Publication Date: 2020-07-03
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current preparation process, dispersant is used to realize the rapid dispersion of lithium carbonate, and the dispersant needs to be removed under conditions such as high temperature, the process is complicated, and the purity of lithium carbonate is easily reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] A kind of in-situ preparation method of lithium carbonate, comprises the steps:

[0016] Step 1, dissolving lithium chloride in absolute ethanol for constant temperature ultrasonic dispersion to form lithium alcohol liquid, the concentration of lithium chloride in absolute ethanol is 20-40g / L, and the ultrasonic frequency for ultrasonic dispersion is 40-80kHz , the temperature is 10-30°C; low-temperature ultrasound forms high-frequency vibrations, quickly dissolves lithium chloride in absolute ethanol, and disperses lithium chloride evenly. At the same time, ultrasound will bring heat energy, causing the temperature of the entire solvent to rise. Carrying out within a certain range can prevent absolute ethanol from evaporating due to heat; this step can obtain a uniformly dispersed lithium chloride ethanol solution;

[0017] Step 2, coating the surface of the aluminum oxide porous foam body by immersion and pulling in lithium alcohol solution, and drying at a constant t...

Embodiment 1

[0021] A kind of in-situ preparation method of lithium carbonate, comprises the steps:

[0022] Step 1, dissolving lithium chloride in 1L of absolute ethanol for constant temperature ultrasonic dispersion to form a lithium alcohol solution, the concentration of lithium chloride in absolute ethanol is 20g / L, the ultrasonic frequency of ultrasonic dispersion is 40kHz, and the temperature is 10°C;

[0023] Step 2, coating the surface of the porous alumina foam body by immersion and pulling in lithium alcohol solution, and drying at a constant temperature to obtain the coated foam body; the immersion speed of the dipping and pulling is 200mm / min, and the residence time is 3s. The pulling speed is 100mm / min, the temperature is 10°C, and the constant temperature drying temperature is 80°C; the porosity of the alumina porous foam is 60ppi; the pretreatment method of alumina includes the following steps: In step a, the alumina is soaked in distilled water and absolute ethanol for mic...

Embodiment 2

[0028] A kind of in-situ preparation method of lithium carbonate, comprises the steps:

[0029] Step 1, dissolving lithium chloride in 1L of absolute ethanol for constant temperature ultrasonic dispersion to form lithium alcohol liquid, the concentration of lithium chloride in absolute ethanol is 40g / L, the ultrasonic frequency of ultrasonic dispersion is 80kHz, and the temperature is 30°C;

[0030] Step 2, coating the surface of the alumina porous foam body by immersion and pulling in lithium alcohol solution, and drying at a constant temperature to obtain the coated foam body; the immersion speed of the dipping and pulling is 400mm / min, and the residence time is 6s. The pulling speed is 300mm / min, the temperature is 20°C, and the constant temperature drying temperature is 90°C; the porosity of the alumina porous foam is 100ppi; the pretreatment method of alumina includes the following steps: In step a, the aluminum oxide is soaked in distilled water and absolute ethanol in tu...

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Abstract

The invention discloses an in-situ preparation method of lithium carbonate. The in-situ preparation method comprises the following steps: dissolving lithium chloride in anhydrous ethanol, carrying outconstant-temperature ultrasonic dispersion to form a lithium alcohol solution; coating the surface of an aluminum oxide porous foaming body with the lithium alcohol solution in a leaching and pullingmanner, drying at a constant temperature to obtain a coated foaming body; putting the coated foaming body into a reaction kettle, introducing low-humidity carbon dioxide gas into the reaction kettle,carrying out reactions for 2-4 hours at a constant temperature under a constant pressure to obtain a foaming body with a lithium carbonate film; soaking the foaming body with a lithium carbonate filmin an anhydrous ethanol solution, carrying out ultrasonic stripping for 2-4 hours, removing the foaming body, filtering, soaking the filtered material in a sodium hydroxide solution for 30-40 minutes, filtering again, washing the filtered material by anhydrous ethanol, and drying to obtain lithium carbonate. The problem that a conventional preparation method depends on a dispersing agent is solved; lithium carbonate particles are uniformly distributed on the surface of a foaming body by utilizing an in-situ reaction system with a solid-gas structure, and the uniformly dispersed lithium carbonate particles are obtained in a stripping manner.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to an in-situ preparation method of 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. Nanoscale electrode materials for lithium-ion batteries have the characteristics of small grain size, large specific surface area, and high ion diffusion coefficient, which is conducive to the insertion and extraction of lithium ions in the active material in the inner layer of the particle, improving the utilization rate of the active material, and improving the charge of th...

Claims

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Application Information

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IPC IPC(8): C01D15/08
CPCC01D15/08C01P2004/61C01P2006/80
Inventor 黄俊杰
Owner SHAOXING UNIVERSITY
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