Preparation method of high-purity sodium tetrachloroaluminate for sodium salt battery

A sodium tetrachloroaluminate, high-purity technology, applied in the direction of secondary batteries, chemical instruments and methods, circuits, etc., can solve the problems of high price, complex production process, energy consumption and other problems of sodium tetrachloroaluminate, and achieve process can be achieved control, equipment is simple, and the effect of cost reduction

Inactive Publication Date: 2020-02-21
浙江安力能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the synthesis process that the production process is very complicated, the required equipment and environmental protection measures (chlorine gas + aluminum trichloride steam) need to be very h

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0021] The preparation method of the sodium salt battery high-purity sodium tetrachloroaluminate of the present invention, as following steps,

[0022] (1) Weigh anhydrous aluminum trichloride (purity 90~99.900%) and anhydrous sodium chloride (purity 95~99.900%) according to the molar ratio of anhydrous aluminum trichloride and anhydrous sodium chloride 1:0.950~1.500 %), then weigh metal aluminum according to the mass ratio of the mass sum of anhydrous aluminum trichloride and anhydrous sodium chloride to metal aluminum (aluminum scrap or aluminum powder or aluminum foil or aluminum block) 1000:1~10;

[0023] (2) Mix anhydrous aluminum trichloride, anhydrous sodium chloride and metal aluminum evenly;

[0024] (3) Add uniformly mixed anhydrous aluminum trichloride, anhydrous sodium chloride and metal aluminum into the reaction kettle and insert high-purity nitrogen for heating; after all materials are liquefied, open the top cover of the reaction kettle and continue stirring C...

Embodiment approach 1

[0029] First, weigh anhydrous aluminum trichloride (purity 98.500%) and anhydrous sodium chloride (purity 99.200%) according to the molar ratio of anhydrous aluminum trichloride: anhydrous sodium chloride 1:0.985, and then according to anhydrous three The mass sum of aluminum chloride and anhydrous sodium chloride: the mass ratio of aluminum chips is 1000:1.5 to weigh metal aluminum;

[0030] Then, mix anhydrous aluminum trichloride, anhydrous sodium chloride and metal aluminum evenly;

[0031] One-step reaction method: add uniformly mixed anhydrous aluminum trichloride, anhydrous sodium chloride and metal aluminum into the reactor; Connect to the tail gas absorption device of the lye pool; set the heating temperature of the reactor to 190°C, turn on the heating switch of the reactor, and raise the temperature of the reactor to the set temperature within 1 hour; after all the materials are liquefied, open the top cover of the reactor and continue stirring 2min; then cover the...

Embodiment approach 2

[0036] First, weigh anhydrous aluminum trichloride (purity 98.500%) and anhydrous sodium chloride (purity 99.200%) according to the molar ratio of anhydrous aluminum trichloride: anhydrous sodium chloride 1:1, then according to anhydrous three The mass sum of aluminum chloride and anhydrous sodium chloride: the mass ratio of aluminum chips is 1000:2.2 to weigh metal aluminum;

[0037] Then, mix anhydrous aluminum trichloride, anhydrous sodium chloride and metal aluminum evenly;

[0038] One-step reaction method: add uniformly mixed anhydrous aluminum trichloride, anhydrous sodium chloride and metal aluminum into the reactor; Connect to the tail gas absorption device of the lye pool; set the heating temperature of the reactor to 210°C, turn on the heating switch of the reactor, and raise the temperature of the reactor to the set temperature within 1 hour; after all the materials are liquefied, open the top cover of the reactor and continue stirring 3min; then cover the top cov...

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Abstract

The invention relates to a preparation method of high-purity sodium tetrachloroaluminate as a second electrolyte of a sodium salt battery. The method comprises the following steps: uniformly mixing anhydrous aluminum trichloride, anhydrous sodium chloride and metal aluminum; adding the anhydrous aluminum trichloride, anhydrous sodium chloride and metal aluminum after uniform mixing into a reactorand introducing high-purity nitrogen and performing heating; opening a top lid of the reactor after all the materials are liquefied, performing continuous stirring and then closing the top lid of thereactor, and continuously keeping the temperature; transferring a supernatant in the reactor into a material storage tank heated to 170-250 DEG C in advance after the reaction is completed; connectingthe material storage tank maintained at 170-250 DEG C into a vacuum purification apparatus, and performing purification on a product for 0.5-2 h; and cooling the material storage tank and introducingan inert gas for sealing and storage to obtain the final high-purity sodium tetrachloroaluminate crystal product. The purity of sodium tetrachloroaluminate prepared by the method of the invention canreach 99.5% or more, and can meet requirements for electrolyte purity of the sodium salt battery.

Description

technical field [0001] The invention relates to the field of sodium salt batteries. Background technique [0002] Today, with the rapid development and expansion of lithium-ion batteries, sodium-salt batteries have attracted more and more attention from enterprises and scientific research institutions because of their high safety, long life, and environmental protection. [0003] Sodium-salt battery is a high-temperature battery with an operating temperature of 250-325°C. Under this condition, its second electrolyte, sodium tetrachloroaluminate, exists in liquid form. The role of sodium tetrachloroaluminate is to transport sodium ions to the solid phase interface of the first electrolyte β-alumina ceramic tube during the charging process. After the sodium ions are exchanged with the original sodium ions in the ceramic tube, electrons are obtained at the negative electrode of the battery. Reduction; during the discharge process, the sodium element loses electrons at the nega...

Claims

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Application Information

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IPC IPC(8): C01F7/00H01M10/39
CPCH01M10/39C01P2006/80C01F7/78Y02E60/10
Inventor 李伟伟刘志鹏冯锋杨贞胜张洪涛石再军
Owner 浙江安力能源有限公司
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