Method for preparing high-purity anhydrous lithium perchlorate from battery-grade lithium hydroxide monohydrate

A technology of lithium hydroxide monohydrate and lithium perchlorate, which is applied in the direction of perchloric acid and perchlorate, can solve the problems of difficult dehydration, high water content, and low main content of lithium perchlorate, and it is easy to achieve industrialization , low production cost, and little environmental pollution

Active Publication Date: 2020-02-25
GANFENG LITHIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] is deficient for existing technology, the invention provides a kind of method utilizing battery grade lithium hydroxide monohydrate to prepare high-purity anhydrous lithium perchlorate, Overcome the deficiencies of the above-men...

Method used

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Experimental program
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Effect test

Embodiment 1

[0037] A. Dissolution of battery-grade lithium hydroxide monohydrate: Under normal temperature conditions, take 200g of battery-grade lithium hydroxide monohydrate and pour it into a reaction vessel filled with pure water. The mass of pure water and lithium hydroxide monohydrate is liquid-solid Pure water with a ratio of 3:1 was stirred for 10 minutes to obtain a lithium hydroxide solution.

[0038] B, neutralization reaction: at normal temperature, slowly pour molar ratio Li:ClO to the lithium hydroxide solution that step A obtains under stirring condition 4 - It is a 1:1 perchloric acid solution, the concentration of perchloric acid is 70%, and the addition rate is 30ml / min. After the reaction, the pH is adjusted to 7 with lithium hydroxide, and then the reaction is stirred for 10 minutes.

[0039] C, filter impurity removal: at normal temperature, filter while hot the solution of pH 7 obtained by the above step B to remove alkaline insoluble matter and other impurities, an...

Embodiment 2

[0046] A. Dissolution of battery-grade lithium hydroxide monohydrate: Under normal temperature conditions, take 400g of battery-grade lithium hydroxide monohydrate and pour it into a reaction vessel filled with pure water. The mass of pure water and lithium hydroxide monohydrate is liquid-solid Pure water with a ratio of 2:1 was stirred for 20 minutes to obtain a lithium hydroxide solution.

[0047] B, neutralization reaction: at normal temperature, slowly pour molar ratio Li:ClO to the lithium hydroxide solution that A step obtains under stirring condition 4 - It is a 1:1 perchloric acid solution, the concentration of perchloric acid is 72%, and the addition rate is 50ml / min. After the reaction, the pH is adjusted to 8 with lithium hydroxide, and then the reaction is stirred for 30 minutes.

[0048] C. Filtration to remove impurities: At normal temperature, the solution obtained above with a pH of 8 was filtered while hot to remove alkaline insolubles and other impurities to...

Embodiment 3

[0055] A. Dissolution of battery-grade lithium hydroxide monohydrate: Under normal temperature conditions, take 300g of battery-grade lithium hydroxide monohydrate and pour it into a reaction vessel filled with pure water. The mass of pure water and lithium hydroxide monohydrate is liquid-solid Pure water with a ratio of 2.5:1 was stirred for 15 minutes to obtain a lithium hydroxide solution.

[0056] B, neutralization reaction: at normal temperature, slowly pour molar ratio Li:ClO to the lithium hydroxide solution that A step obtains under stirring condition 4 - It is a 1:1 perchloric acid solution, the concentration of perchloric acid is 70%, and the rate of addition is 35ml / min. After the reaction, the pH is adjusted to 7.5 with lithium hydroxide, and then the reaction is stirred for 20 minutes.

[0057] C. Filtration to remove impurities: At normal temperature, the solution obtained above with a pH of 7.5 was filtered while hot to remove alkaline insolubles and other impu...

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Abstract

The invention discloses a method for preparing high-purity anhydrous lithium perchlorate from battery-grade lithium hydroxide monohydrate, and belongs to the technical field of electrolyte preparationfor lithium battery electrolyte solutions. The method comprises the following process steps: A, dissolving of the lithium hydroxide monohydrate; B, a neutralization reaction; C, filtration for removing impurities; D, concentration and dehydration; E, ethanol dehydration; F, cooling crystallization; G, vacuum primary drying and crushing; and H, vacuum secondary drying, crushing and packaging. Themethod for preparing the high-purity anhydrous lithium perchlorate from the battery-grade lithium hydroxide monohydrate has the advantages of simple process, high yield, high economic values and smallenvironmental pollution.

Description

technical field [0001] The invention relates to the technical field of electrolyte preparation for lithium batteries, in particular to a method for preparing anhydrous lithium perchlorate, in particular to a method for preparing high-purity anhydrous lithium perchlorate by utilizing battery-grade lithium hydroxide monohydrate . Background technique [0002] my country began to conduct research on lithium batteries in the 1960s, and lithium batteries began to rise in the 1990s, including lithium primary batteries and lithium secondary batteries. Lithium perchlorate is mainly used in the electrolyte of lithium batteries, and as the electrolyte in the electrolyte of lithium batteries, there are extremely strict requirements on its water content, and the water content is the key to the quality assurance of lithium batteries. At present, the preparation of anhydrous lithium perchlorate mainly includes neutralization method and double decomposition method. Wherein, the neutraliz...

Claims

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Application Information

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IPC IPC(8): C01B11/18
CPCC01B11/18C01P2006/80Y02E60/10
Inventor 李良彬叶明廖萃谢军胡志华胡玉潘志芳张阳阳胡斌刘明彭爱平
Owner GANFENG LITHIUM CO LTD
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