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Preparation method of nano lithium carbonate

A lithium carbonate and nanotechnology, applied in the direction of nanotechnology, lithium carbonate;/acid carbonate, etc., can solve the problems of low membrane filtration efficiency and achieve high reactivity, simple steps and high purity

Pending Publication Date: 2021-03-30
HENGYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, methods such as ball milling, pulverization, and membrane filtration are mainly used to prepare nano-lithium carbonate, but other impurities are often brought in during pulverization, ball milling, etc., and the efficiency of membrane filtration is low.

Method used

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  • Preparation method of nano lithium carbonate
  • Preparation method of nano lithium carbonate
  • Preparation method of nano lithium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] At room temperature, dissolve high-purity lithium carbonate in 25ml of water until saturated, filter the undissolved lithium carbonate, and reserve the undissolved lithium carbonate for the next process to prepare lithium carbonate solution, and place the filtrate at -50~-40°C Pre-freeze in a cold trap to prepare small-particle ice cubes, and vacuum-dry for 12 hours under the condition of maintaining freezing to obtain highly active, ultrafine white lithium carbonate powder. The XRD pattern of nano-lithium carbonate product is as follows figure 1 As shown in 1, the shape is as figure 2 shown. From figure 1 In 1, it can be seen that there is only one pure phase of lithium carbonate, figure 2 It can be seen that the particle size is about 100 nanometers, and it is in a dispersed state, not dense.

Embodiment 2

[0025] At room temperature, dissolve high-purity lithium carbonate in 25ml of water until saturation is reached, filter the undissolved lithium carbonate, and reserve the undissolved lithium carbonate for the next process to prepare a lithium carbonate solution. Take 5ml of the saturated solution and add 20mL of water. Pre-freeze in a cold trap at -50 to -40°C to prepare small-particle ice cubes, and then vacuum-dry them for 12 hours while maintaining freezing conditions to obtain highly active, ultrafine white lithium carbonate powder. looks like image 3 As shown, it can be seen that the particles are about ~30 nanometers, and are in a dispersed state, not dense.

Embodiment 3

[0027] At room temperature, dissolve high-purity lithium carbonate in 25ml of water until it reaches saturation, filter the undissolved lithium carbonate, save the undissolved lithium carbonate for the next process to prepare lithium carbonate solution, add 2 to 5ml of ethanol to the filtrate, and instantly A large amount of white emulsion is produced, and the white emulsion is placed in a cold trap at -50 to -40°C, and the prepared small-particle ice cubes are evacuated for 12 hours under freezing conditions to obtain highly active, ultrafine white lithium carbonate powder. The XRD pattern of nano-lithium carbonate product is as follows figure 1 As shown in 2, from figure 1 In 2, it can be seen that there is only one pure phase of lithium carbonate, and the morphology is as follows Figure 4 As shown, it can be seen that most of the particles are smaller than 100 nanometers, and are in a dispersed state, not dense.

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Abstract

The invention discloses a preparation method of nano lithium carbonate. The method comprises the following steps: freezing a lithium carbonate solution into ice cubes, and freeze-drying to obtain thenanoscale lithium carbonate. The method is easy to operate and low in cost, and the prepared lithium carbonate is nanoscale, uniform in particle size, controllable in particle size and higher in reaction activity, and has obvious advantages compared with lithium carbonate prepared by crushing, ball milling and other methods.

Description

technical field [0001] The invention relates to a method for preparing lithium carbonate, in particular to a method for preparing nanometer lithium carbonate by freezing and freeze-drying techniques, and belongs to the technical field of lithium carbonate preparation. Background technique [0002] Lithium carbonate is a very important lithium compound, widely used in enamel, glass manufacturing, semiconductor, synthetic rubber, medicine, defense industry, etc. [0003] In the ceramic industry, lithium carbonate is used as an additive in the preparation of low-melting point ceramics and glass, which can significantly improve the thermal shock resistance of ceramics. [0004] Lithium carbonate is also an important raw material for the preparation of lithium-ion batteries, such as lithium cobaltate, lithium manganate, and ternary cathode materials. Lithium carbonate is required, and the size of lithium carbonate particles directly affects the activity of the reaction. [0005]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08B82Y40/00
CPCC01D15/08B82Y40/00C01P2002/72C01P2004/03Y02E60/10
Inventor 卢伟红孙俊彬陈满生
Owner HENGYANG NORMAL UNIV
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