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Preparation method for anhydrous lithium iodide

A technology of lithium iodide and lithium hydroxide is applied in the field of preparation of anhydrous lithium iodide, which can solve the problems of low yield and the like, and achieve the effects of cheap raw materials, simple process and low cost.

Inactive Publication Date: 2013-06-05
潘群生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong decomposition ability of lithium iodide at high temperature, the yield of this method is low, and there will be trace moisture

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of preparation method of anhydrous lithium iodide, it comprises the steps:

[0017] 1) Add 500g of water, 1.1mol of reduced iron powder and 1mol of elemental iodine particles into the reactor, mix well and stir for 8 hours at 25±2°C to generate ferrous iodide solution, then add 1.2mol of hydroxide Lithium was stirred for 6 hours to precipitate ferrous ions, centrifuged, and the solid precipitate was discarded, and the obtained centrifugal supernatant was lithium iodide solution;

[0018] 2) Concentrate the lithium iodide solution at 80 degrees, send the concentrated solution to a vacuum drying oven, and place it at a constant temperature for 18 hours at a temperature of 160°C and a vacuum of -0.1MPa to obtain a lithium iodide solid material containing crystal water;

[0019] 3) Dissolve the lithium iodide solid material containing crystal water in propylene carbonate (keep the concentration of lithium iodide in PC at 1mol / l), and carry out constant voltage under ...

Embodiment 2

[0021] The organic solvent propylene carbonate in step 3) was replaced with ethylene glycol dimethyl ether, and other conditions were the same as in Example 1.

Embodiment 3

[0023] The organic solvent propylene carbonate in step 3) was replaced with diethyl carbonate, and other conditions were the same as in Example 1.

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Abstract

The invention relates to a preparation method for anhydrous lithium iodide. The preparation method comprises the following steps: (1) mixing water, elemental iodine particles and excessive iron powder and enabling the mixture to react for 5-8 hours under 20 DEG C to 50 DEG C, adding and stirring excessive lithium hydroxide to react for 4-7 hours, carrying out solid-liquid separation to obtain liquid phase, concentrating and drying the obtained liquid phase to a crystal water containing lithium iodide solid material; and (2) dissolving the crystal water containing lithium iodide solid material in organic solvent, carrying out electrochemical electrolysis under the action of a catalytic reduction electrode and a metal lithium electrode, filtering electrolyte after the electrolysis and removing the organic solvent from the filtrate to obtain the anhydrous lithium iodide. The preparation method disclosed by the invention is simple in process and lower in cost (the materials are cheap and high-temperature synthesis condition is not needed). Moreover, the prepared anhydrous lithium iodide is prepared into the electrolyte of a lithium-iron battery; according to the test results, the lithium-iron battery has good performances.

Description

technical field [0001] The invention belongs to the technical field of new battery energy, and in particular relates to a method for preparing anhydrous lithium iodide. The lithium iodide prepared by the method can be used as an organic electrolyte in a novel high-energy lithium iron disulfide primary battery. Background technique [0002] Although the performance-price ratio of lithium-iron batteries currently on the market is much higher than other battery products, for example, the discharge time of lithium-iron batteries is generally 7 times that of ordinary alkaline batteries, and its price is 3-4 times that of ordinary alkaline batteries. . However, the relatively high price of a single battery and the familiarity of users with this product have inhibited the promotion of high-performance lithium-iron batteries in the market. Reducing the cost of lithium-iron batteries is an important factor for the large-scale successful promotion of high-performance lithium-iron bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M6/16
CPCY02E60/12
Inventor 潘群生
Owner 潘群生
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