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Preparation method of anhydrous lithium iodide

A technology of lithium iodide and lithium hydroxide, applied in lithium halide and other directions, can solve the problems of shortened reaction time, easy deliquescence of lithium iodide, difficult packaging, etc., and achieves the effects of high product purity, short time consumption, and long time-consuming solution.

Active Publication Date: 2015-01-07
HUBEI BAIJIERUI ADVANCED MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the deficiencies in the prior art, the technical problem to be solved in the present invention is to overcome the time-consuming and high cost of existing anhydrous lithium iodide preparation methods, technical defects such as difficulty in large-scale production and packaging difficulties. Basically, the technological process is simplified, the reaction time is greatly shortened, the difficult problem that lithium iodide is easily deliquescent in the air is solved, and a method for preparing battery-grade anhydrous lithium iodide is provided

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  • Preparation method of anhydrous lithium iodide

Examples

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Embodiment 1

[0027] A preparation method for anhydrous lithium iodide, the steps are as follows:

[0028] (1) Add 8L of pure water into the reactor, then add 7.0Kg of iodine element, stir for 15 minutes to dissolve completely, then add 2.25Kg of recrystallized lithium hydroxide, stir for 5 minutes, slowly add 80wt% hydrazine hydrate into the reactor , until the solution just turns white (the amount of 80wt% hydrazine hydrate is about 0.8Kg), stabilize for 10 minutes, then add a small amount of iodine, until the solution just turns red, then add a small amount of 8wt% hydrazine hydrate to turn the color of the solution back to white , and then use recrystallized lithium hydroxide solid to adjust the pH value to 7.5, heat, evaporate and concentrate to 124 ° C, and the volume is concentrated to 1 / 2 of the original volume, then cooled to room temperature with cold water, and filtered to obtain the filtrate.

[0029] (2) Put the obtained filtrate into a reaction kettle, and evaporate and concen...

Embodiment 2

[0033] A preparation method for anhydrous lithium iodide, the steps are as follows:

[0034] (1) Add 9L of pure water into the reactor, then add 7.8Kg of iodine element, stir for 10 minutes to dissolve completely, then add 2.5Kg of recrystallized lithium hydroxide, stir for 5 minutes, slowly add 80wt% hydrazine hydrate into the reactor Just turn into white (the consumption of 80wt% hydrazine hydrate is about 0.89Kg) until solution, stabilize 10 minutes, then add a small amount of iodine, just all turn red to solution, add a small amount of 5wt% hydrazine hydrate to just adjust the solution color back to white, Then use recrystallized lithium hydroxide solid to adjust the pH value to 8.0, heat, evaporate and concentrate to 125°C, and concentrate the volume to 1 / 2 of the original volume, then cool to room temperature with cold water, and filter to obtain the filtrate.

[0035] (2) Put the obtained filtrate into a reaction kettle, and evaporate and concentrate under stirring to o...

Embodiment 3

[0039] A preparation method for anhydrous lithium iodide, the steps are as follows:

[0040] (1) Add 12L of pure water into the reactor, then add 8.75Kg of iodine element, stir for 15 minutes to dissolve completely, then add 2.8Kg of recrystallized lithium hydroxide, stir for 5 minutes, slowly add 80wt% hydrazine hydrate into the reactor Just turn into white (the consumption of 80wt% hydrazine hydrate is about 0.10Kg) until solution, stabilize for 10 minutes, then add a small amount of iodine, just all turn red to solution, add a small amount of 10wt% hydrazine hydrate to just adjust the solution color back to white, Then use recrystallized lithium hydroxide solid to adjust the pH value to 8.0, heat, evaporate and concentrate to 127°C, and concentrate the volume to 3 / 5 of the original volume, then cool to room temperature with cold water, and filter to obtain the filtrate.

[0041] (2) Put the obtained filtrate into a reaction kettle, and evaporate and concentrate under stirri...

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Abstract

The invention belongs to the technical field of electrolyte preparation of lithium battery electrolytic liquids, and particularly relates to a preparation method of anhydrous lithium iodide. The preparation method of anhydrous lithium iodide comprises the following steps of reacting iodine, hydrazine hydrate and lithium hydroxide by using an aqueous liquid method, sequentially carrying out evaporation and concentration, filtration, and heated concentration on the obtained product, feeding inert gas into the obtained product to dehydrate, and packaging the obtained product under the protection of the inert gas. No organic solvent is added in the whole process; and the method is simple in technological process and short in time consumption, and solves the problems that traditional production methods are long in time consumption, iodide lithium packages are deliquescent, and the like.

Description

technical field [0001] The invention relates to the technical field of electrolyte preparation for lithium battery electrolyte, in particular to a method for preparing anhydrous lithium iodide. Background technique [0002] Lithium iodide is commonly used in the photographic industry and the pharmaceutical industry and in the synthesis of related artificial crystals, as well as the catalytic dehydrogenation of hydrocarbons, and is also used as an electrolyte for high-temperature resistant and long-life batteries. In the process of preparing anhydrous lithium iodide, since anhydrous lithium iodide is easy to deliquesce, and it is easy to precipitate iodine simple substance and turn yellow when it is exposed to light or exposed to air, and it is easy to be oxidized when heated in air, so the preparation of anhydrous iodine The lithium iodide raw material is relatively difficult, and the packaging for anhydrous lithium iodide is also a problem. [0003] At present, the methods...

Claims

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Application Information

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IPC IPC(8): C01D15/04
Inventor 吴满梅徐涛纪东海
Owner HUBEI BAIJIERUI ADVANCED MATERIALS
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