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Preparation method of battery-grade zinc bromide

A zinc bromide and battery-level technology, applied in the direction of zinc halide, etc., can solve the problems of inability to realize large-scale production, consume a lot of energy, and the purity of zinc bromide is not high, and achieve low production costs, easy availability of raw materials, and high purity Effect

Inactive Publication Date: 2012-09-12
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purity of zinc bromide prepared under conventional conditions is not high, about 98%
The main method of purifying it into battery-grade products is vacuum sublimation, which consumes a lot of energy and cannot be mass-produced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Put 1.6 moles of zinc powder in 100 mL of deionized water, add dropwise 1 mole of bromine, stir at room temperature for 24 hours, and filter; dilute the filtrate to 10 liters, mix with 1200 g of cotton, stir at room temperature for 24 hours, filter, and concentrate to obtain battery grade Zinc bromide has a detected melting point of 394°C, a purity of greater than 99.99%, and a total content of impurity heavy metals of less than 10ppm.

Embodiment 2

[0012] Put 1.2 moles of zinc powder in 100 mL of deionized water, add 1 mole of bromine dropwise, stir at room temperature for 24 hours, and filter; dilute the filtrate to 10 liters, mix with 1000 g of bamboo fiber, stir at room temperature for 24 hours, filter, and concentrate to obtain a battery Grade zinc bromide, the detected melting point is 394°C, the purity is greater than 99.99%, and the total content of impurity heavy metals is less than 10ppm.

Embodiment 3

[0014] Put 1.4 moles of zinc powder in 150 mL of deionized water, add dropwise 1 mole of bromine, stir at room temperature for 24 hours, and filter; dilute the filtrate to 10 liters, mix with 1500 g of flax, stir at room temperature for 24 hours, filter, and concentrate to obtain battery grade Zinc bromide has a detected melting point of 394°C, a purity of greater than 99.99%, and a total content of impurity heavy metals of less than 10ppm.

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Abstract

The invention belongs to the field of an electronic material and relates to a preparation method of a battery-grade zinc bromide. The preparation method provided by the invention comprises the following steps of: (1) placing zinc powder in deionized water, dropwise adding a bromine elementary substance, stirring for 24 hours and filtering; diluting filtrate, mixing the filtrate with a natural fiber material, stirring for 24 hours, filtering, concentrating and obtaining the battery-grade zinc bromide. The zinc bromide prepared by the invention has the advantages: (1) the purity is high and is greater than 99.99%; (2) the technology is simple and is suitable for large-scale production; and (3) raw materials are easily obtained, and the production cost is low. The zinc bromide prepared by the invention can be widely applied to industrial fields of high-capacity chargeable batteries and high-efficiency solar batteries.

Description

technical field [0001] The invention belongs to the technical field of electronic materials, and in particular relates to a preparation method of battery-grade zinc bromide. Background technique [0002] Zinc bromide is mainly used as offshore oil drilling and completion fluid, cementing fluid, workover fluid, and is also an important raw material in the pharmaceutical industry. High-tech applications such as rechargeable batteries, optoelectronic devices and other electronic materials have high requirements on the quality of zinc bromide. Industrial-grade zinc bromide must be refined to remove impurities such as inorganic salts in order to achieve the quality indicators of various special products. Require. [0003] The electrolyte of the zinc-bromine flow battery is zinc bromide aqueous solution. During the charging process, zinc is deposited on the surface of the conductive plastic electrode in the form of metal, and bromine forms an oily complex, which is stored at the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/04
Inventor 吕银祥
Owner FUDAN UNIV
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