Method for preparing metal lithium by electrolyzing molten salt

A molten salt electrolysis and metal lithium technology, applied in the field of metallurgy, can solve the problems of products being easily polluted by air, unable to meet the requirements of high-energy batteries, and many impurities entrained by metal lithium, so as to improve the production environment, improve product quality and yield, reduce The effect of production costs

Active Publication Date: 2010-06-30
合肥山河锂盐新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of scooping out lithium metal, the product is easily polluted by the air, which reduces the purity of lithium metal and cannot meet the requirements of high-energy batteries, lithium alloys and co...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 A method for preparing lithium metal by molten salt electrolysis, comprising the following steps:

[0022] (1) Lithium chloride was put into a constant temperature drying oven, and dried at 300° C. for 1 hour; potassium chloride was put into a constant temperature drying oven, and dried at 400° C. for 1 hour.

[0023] (2) After the dried lithium chloride and potassium chloride are uniformly mixed in a weight ratio of 0.8:1, the temperature is raised in an electrolytic cell (developed by the Qinghai Institute of Salt Lake, Chinese Academy of Sciences) until they are completely melted.

[0024] (3) When the electrolyte temperature is stabilized at 415°C, pass cooling water at a temperature of 25°C to the electrolytic cell to form a stable crust layer on the cell wall.

[0025] (4) energizing is that the direct current of 1600A carries out electrolysis, and this moment direct current voltage is 7.80V; Start magnetic force pump, blower fan simultaneously, make ...

Embodiment 2

[0028] Embodiment 2 A method for preparing metallic lithium by molten salt electrolysis, comprising the following steps:

[0029] (1) Lithium chloride was put into a constant temperature drying oven, and dried at 200° C. for 2 hours; potassium chloride was put into a constant temperature drying oven, and dried at 500° C. for 1 hour.

[0030] (2) After the dried lithium chloride and potassium chloride are uniformly mixed in a weight ratio of 1.3:1, the temperature is raised in an electrolytic cell (developed by Qinghai Salt Lake Research Institute, Chinese Academy of Sciences) until they are completely melted.

[0031] (3) When the electrolyte temperature is stabilized at 420°C, pass cooling water with a temperature of 20°C to the electrolytic cell to form a stable crust layer on the cell wall.

[0032] (4) energizing is that the direct current of 1700A carries out electrolysis, and this moment direct current voltage is 6.39V; Start magnetic force pump, blower fan simultaneousl...

Embodiment 3

[0035] Embodiment 3 A method for preparing metallic lithium by molten salt electrolysis, comprising the following steps:

[0036] (1) Lithium chloride was put into a constant temperature drying oven, and dried at 400° C. for 1 hour; potassium chloride was put into a constant temperature drying oven, and dried at 600° C. for 1 hour.

[0037] (2) After the dried lithium chloride and potassium chloride are uniformly mixed in a weight ratio of 1:1, the temperature is raised in an electrolytic cell (developed by the Qinghai Salt Lake Research Institute of the Chinese Academy of Sciences) until they are completely melted.

[0038] (3) When the electrolyte temperature is stabilized at 430°C, pass cooling water with a temperature of 15°C to the electrolytic cell to form a stable crust layer on the cell wall.

[0039] (4) energizing is that the direct current of 2200A carries out electrolysis, and this moment direct current voltage is 6.87V; Start magnetic force pump, blower fan simult...

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Abstract

The invention relates to a method for preparing metal lithium by electrolyzing molten salt. The steps of the method are as follows: (1) lithium chloride and potassium chloride are respectively dried; (2) the dried lithium chloride and the dried potassium chloride are heated in an electrolytic tank until to be completely melted after being uniformly mixed according to the weight ratio of 0.8 to 1.3:1; (3) when the temperature of an electrolyte is stabilized within 415 to 450 DEG C, cooling water is added to the electrolytic tank to form a stable crusting layer on the tank wall; (4) DC electricity is supplied for electrolyzing, and a magnetic pump and a blower are started at the same time to circulate alkaline solution in a tail gas recycling system reactor; (5) after the electrolyzing is carried out for 0.5 to 2h, the liquid metal lithium generated by a cathode is guided out after being collected and is then ingot-cast under the protection of inert gases; meanwhile, chlorine generated by an anode is discharged, is absorbed by the alkaline solution after being cooled to the room temperature, so as to obtain sodium hypochlorite solution. By utilizing the buoyancy of the electrolyte to the metal lithium, the method in the invention can automatically guide lithium out of the electrolytic tank, so as to solve the problem of manual lithium discharging, thereby improving the purity of the metal lithium to higher than 99.0%.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for preparing metallic lithium by molten salt electrolysis. Background technique [0002] Lithium metal has the advantages of light weight, high negative potential, and large specific energy. Lithium batteries are widely used in household appliances, computer communication equipment, electric vehicles and other fields, and have become new battery energy materials. [0003] The production methods of metallic lithium mainly include molten salt electrolysis and vacuum thermal reduction. The production of metal lithium by vacuum thermal reduction method is still in the laboratory research stage. It has disadvantages such as high temperature, high process requirements, high slag production rate and low product quality. It cannot be applied to industrial production on a large scale at this stage. The traditional molten salt electrolysis process is mature. It puts anhydrous lithium c...

Claims

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Application Information

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IPC IPC(8): C25C3/02
Inventor 李权庞全世高洁狄晓亮李昱昀
Owner 合肥山河锂盐新能源科技有限公司
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