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

A technology of phosphorus pentafluoride and phosphorus pentachloride is applied in chemical instruments and methods, phosphorus halide/oxyhalide, inorganic chemistry and other directions, can solve the problem of low yield of lithium hexafluorophosphate, etc., and achieves low production cost, low purity, high purity effect

Active Publication Date: 2010-10-06
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 the method of the prior art is not high, and to provide a method for preparing lithium hexafluorophosphate that can obtain a higher yield

Method used

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Examples

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Effect test

preparation example Construction

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

[0027] The specific preparation method of the lithium hexafluorophosphate includes: at minus 50- minus 10 ℃, mixing solid lithium fluoride with a solvent 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 (relative density of acetonitrile (water = 1 g / cm) 3 ) is 0.79 g / cm 3 ) and 0.8 kg of solid lithium fluoride were added to a 100-liter cylindrical reaction device B (made of carbon steel material; can withstand a pressure of 0.5 MPa and a low temperature of minus 50 ° C; 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 were added to a 100 liter cylindrical reaction device A (made of carbon steel material; 0.5 MPa pressure and minus 50 liters) lined with PTFE ℃ of low temperature; the aspect ratio is 1.2), and stir to completely dissolve the phosphorus pentachloride to form a phosphorus pentachloride solut...

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 kg of solid lithium fluoride were added to a 100-liter cylindrical reaction device B (made of carbon steel material; it can withstand a pressure of 0.5 MPa and minus 50 ℃ of low temperature; the aspect ratio is 1.2), and fully stirred to form a suspension for use (the mass ratio of lithium fluoride and acetonitrile is 0.075:1).

[0042] (2) 59.0 liters of acetonitrile solvent and 26.0 kg of phosphorus pentachloride were added to a 100-liter cylindrical reaction device A (made of carbon steel material; it can withstand a pressure of 0.5 MPa and minus 50 ℃ of low temperature; the aspect ratio is 1.2), and stir to completely dissolve the phosphorus pentachloride to form a phosphorus pentachloride solution (the mass ratio of phosphorus pentachloride and acetonitrile is 0.55:1)...

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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 preparation method of phosphorus pentafluoride gas and a method for preparing lithium hexafluorophosphate by using the gas, in particular to a preparation method of phosphorus pentafluoride gas and using the gas to prepare a lithium hexafluorophosphate used as an electrolyte 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 ), carbon material cathode (such as graphite) and 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 battery must meet the following properties, namely high electrical conductivity, good chemical and electrochem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/10C01B25/455
Inventor 罗朝辉金建泽冉云聪
Owner BYD CO LTD
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