Preparation method of lithium hexafluorophate

A technology of lithium hexafluorophosphate and lithium fluoride, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low product purity, environmental protection phosphorus emission, and high acidity, and achieves guaranteed purity, reduced moisture and metal impurities, The effect of reducing production costs

Active Publication Date: 2012-06-20
JIANGSU XINTAI MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is relatively simple, but there are also many problems such as relatively low product purity (the purity requirement for electrolytes should reach mo...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 3000kg of anhydrous crude hydrogen fluoride solution into a PTFE-lined stainless steel container, heat it to 22°C through a steam jacket for distillation, and return the steam to the fine product tank through the condensation absorption tower. The condensation temperature is controlled below 0°C, and the process time is 4.5h , to produce anhydrous hydrogen fluoride solution, the purity of which is greater than 99.9%.

[0018] Add 100kg of anhydrous hydrogen fluoride solution and 200kg of phosphorus pentachloride into a tetrafluoro-lined stainless steel tank, control the temperature at 160°C, control the pressure at 0.25Mpa, and react for 1 hour under nitrogen protection to prepare a mixed gas of phosphorus pentafluoride and hydrogen chloride.

[0019] Add 25kg of lithium fluoride and 750kg of anhydrous hydrogen fluoride solution into the preparation kettle (lined with PTFE stainless steel container), heat and control the temperature at 15°C for stirring and dissolvin...

Embodiment 2

[0023] The anhydrous hydrogen fluoride solution is refined and absorbed by distillation to obtain high-purity hydrogen fluoride liquid. The temperature of the reaction process is controlled between 19.5--26.5°C, and then a small amount of water and metal impurities in the anhydrous hydrogen fluoride solution are separated through condensation and absorption to obtain a purity greater than 99.9 % anhydrous hydrogen fluoride solution. The distillation condensation absorption process is about 4.5h (3000kg hydrogen fluoride meter). The distillation residue can be mixed with water to make hydrofluoric acid of different concentrations and sold to companies with different needs.

[0024] Add the prepared high-purity anhydrous hydrogen fluoride solution into a phosphorus pentachloride tank, and react under nitrogen protection to produce a mixed gas of phosphorus pentafluoride and hydrogen chloride. The reaction is relatively violent, and the temperature is between 140-180°C , the pres...

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PUM

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Abstract

The invention discloses a preparation method of lithium hexafluorophate. The preparation method includes preparing gas mixture of phosphorus pentafluoride and hydrogen chloride; preparing anhydrous hydrogen fluoride mixed liquor containing lithium fluoride; realizing combination reaction of the gas mixture and the mixed liquor; realizing quick cooling crystallization of lithium hexafluorophate liquor; separating solid from liquid; realizing rotary vacuum drying; and finally obtaining lithium hexafluorophate crystal. The preparation method is a high-efficiency gas, solid and liquid three-phasereaction method, purity of the quality of products is guaranteed, simultaneously, yield further can be increased, the yield of the products can reach 90% at least, moisture and metal impurities in the products are effectively reduced, zero emission of the phosphorus element can be realized in aftertreatment, requirements of current national environmental protection policy are met, byproducts of hydrochloric acid and hydrofluoric acid can be sold to bring certain income, production cost is further lowered, the quality of the products is further improved by means of adopting high-specification equipment and materials, requirements of high-end electrolyte products can be met, and the preparation method has excellent practicality and can produce good economic benefit and social benefit.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a method for preparing lithium hexafluorophosphate. Background technique [0002] Lithium-ion batteries have outstanding advantages such as high working voltage, high energy density, light weight, low self-discharge rate, no memory effect, long cycle life and no pollution, and are widely used in mobile phones, notebook computers, small cameras, electric vehicles, etc. . With the industrialization of electric vehicles, the amount of lithium-ion batteries will also increase. Lithium hexafluorophosphate is an important electrolyte salt of lithium-ion battery electrolyte, and its demand is bound to increase greatly. [0003] There are usually three methods for producing lithium hexafluorophosphate: dry method, wet method and solvent method, and wet method is generally used now. The process is relatively simple, but there are also many problems such as relativ...

Claims

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Application Information

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IPC IPC(8): C01B25/455
Inventor 王正元姚强
Owner JIANGSU XINTAI MATERIALS TECH CO LTD
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