Methods for preparing phosphorus pentafluoride gas and preparing lithium hexafluorophosphate using the gas

A technology of phosphorus pentafluoride and lithium fluoride, which is applied in the field of preparation of phosphorus pentafluoride gas, can solve the problem of low yield of lithium hexafluorophosphate, and achieve the effects of low production cost, high purity and high production cost

Active Publication Date: 2009-01-28
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcoming that the yield of lithium hexafluorophosphate prepared by th

Method used

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Examples

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preparation example Construction

[0026] According to the present invention, the specific preparation method of phosphorus pentafluoride includes: mixing and stirring phosphorus pentachloride and a solvent at minus 50°C to minus 10°C to obtain a phosphorus pentachloride solution, and then, under the protection of an inert gas , in the contact reaction of anhydrous hydrogen fluoride gas and phosphorus pentachloride solution for 2-6 hours.

[0027] The specific preparation method of lithium hexafluorophosphate includes: mixing solid lithium fluoride with a solvent at minus 50°C to minus 10°C to obtain a lithium fluoride solution, and under the protection of an inert gas, contacting phosphorus pentafluoride gas with the lithium fluoride solution React for 2.5-6 hours.

[0028] Preferably, the above two reactions can be carried out in two reaction devices respectively, and the two reactions can be carried out simultaneously, for example, the reaction for preparing phosphorus pentafluoride is carried out in reactor...

Embodiment 1

[0033] This example is used to illustrate the preparation of phosphorus pentafluoride and lithium hexafluorophosphate provided by the present invention.

[0034] (1) 20 liters of acetonitrile solvent (the relative density of acetonitrile (water=1 g / cm 3 ) is 0.79 g / cm 3 ) and 0.8 kg of solid lithium fluoride are added to a cylindrical reaction device B (made of carbon steel material; it can withstand the pressure of 0.5 MPa and the low temperature of minus 50 ℃; the aspect ratio 1.2), and fully stirred to form a suspension for use (the mass ratio of lithium fluoride to acetonitrile is 0.05:1).

[0035] (2) 21.3 liters of acetonitrile solvent and 9.25 kilograms of phosphorus pentachloride are added to a volume of 100 liters of cylindrical reaction equipment A (prepared by carbon steel materials; can withstand the pressure of 0.5 MPa and minus 50 ℃ low temperature; the aspect ratio is 1.2), and stirred to completely dissolve the phosphorus pentachloride to form a phosphorus pe...

Embodiment 2

[0040] This example is used to illustrate the preparation of phosphorus pentafluoride and lithium hexafluorophosphate provided by the present invention.

[0041] (1) 25 liters of acetonitrile solvent and 1.5 kilograms of solid lithium fluoride are added to a cylindrical reaction device B (made of carbon steel material; it can withstand the pressure of 0.5 MPa and minus 50 ℃ low temperature; the aspect ratio is 1.2), and fully stirred to form a suspension for use (the mass ratio of lithium fluoride to acetonitrile is 0.075:1).

[0042] (2) 59.0 liters of acetonitrile solvent and 26.0 kilograms of phosphorus pentachloride are added to a volume of 100 liters of cylindrical reaction equipment A (prepared by carbon steel materials; can withstand the pressure of 0.5 MPa and minus 50 ℃ low temperature; the aspect ratio is 1.2), and stirred to completely dissolve the phosphorus pentachloride to form a phosphorus pentachloride solution (the mass ratio of phosphorus pentachloride to ace...

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Abstract

A preparation method of phosphorus pentafluoride gas comprises a step of causing phosphorus pentachloride to react with anhydrous hydrogen fluoride, wherein, the reaction occurs in the presence of a solvent. A preparation method of lithium hexaflourophosphate comprises a contact reaction between solid lithium fluoride and phosphorus pentafluoride gas, wherein the phosphorus pentafluoride gas is prepared by the method of the invention. Compared with the preparation method of the lithium hexaflourophosphate with the phosphorus pentafluoride gas as the raw material in the prior art, the phosphorus pentafluoride gas prepared by the preparation method of the invention has higher purity and lower cost. The yield of the lithium hexaflourophosphate prepared by the method of the invention is higher than 93%, and the purity thereof is up to 99.95%.

Description

technical field [0001] The present invention relates to a method for preparing phosphorus pentafluoride gas and a method for preparing lithium hexafluorophosphate using the gas, in particular to a method for preparing phosphorus pentafluoride gas and using the gas for preparing lithium hexafluorophosphate used as an electrolyte solution for lithium-ion batteries method. Background technique [0002] Lithium-ion secondary batteries are mainly composed of lithium oxide anodes (such as LiCoO 2 , LiNiO 2 , LiMn 2 o 4 ), a carbon material cathode (such as graphite) and an electrolyte. Examples of the organic solvent forming the electrolytic solution include a mixed solvent of ethylene carbonate (VC) and dimethyl carbonate (DMC), a mixed solvent of ethylene carbonate (EC) and diethyl carbonate (DEC), and the like. The electrolyte used as the electrolyte solution of lithium-ion batteries must meet the following properties, that is, high electrical conductivity, good chemical a...

Claims

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Application Information

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IPC IPC(8): C01B25/10C01B25/455
Inventor 罗朝辉金建泽冉云聪
Owner BYD CO LTD
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