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Production of lithium hexafluorophosphate

A technology of lithium hexafluorophosphate and perfluorocarbon, which is applied in the directions of lithium hexafluorophosphate, lithium compounds, electrochemical generators, etc., can solve the problems of expensive production time, time-consuming, low yield and the like

Pending Publication Date: 2020-11-24
ЗЕ САУС АФРИКАН НЮКЛИАР ЭНЕРДЖИ КОРПОРЕЙШЕН СОК ЛИМИТЕД
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] Lithium hexafluorophosphate can also use LiF and PCl in water 5 synthesis, however low yields were obtained using this preparation method
The technique is time consuming and the reaction is expected to be complete after 10 hours, which is expensive in terms of production time

Method used

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  • Production of lithium hexafluorophosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Example 1: LiF and PF 5 Reactions of gases in the presence of cyclic or polycyclic perfluorocarbon solvents

[0083] A clean, thick-walled stainless steel reactor capable of handling gas pressures in excess of 10 bar was charged with 2 g of LiF solid powder from Sigma-Aldrich or Alpha-Aesar.

[0084] 60 ml of liquid perfluorodecalin (perfluorodecalin) was added to the reactor, so that the LiF was suspended in the perfluorodecalin.

[0085] The reactor was then sealed in a glove box and connected to a vacuum line, a high pressure indicator and a high pressure PF 5 On a system composed of gas cylinders.

[0086] will PF 5 Gas was introduced into the reactor from its feed bottle, thereby contacting the suspension of LiF in perfluorodecalin.

[0087] Continue to feed PF into the reactor 5 , until equilibrium is reached, maintaining equilibrium (PF 5 The air pressure rise was kept at 7 bar).

[0088] Allow the reaction to digest for at least 1 day.

[0089] Excess ...

Embodiment 2

[0097] Example 2: LiF and PF 5 Reactions of Gases in the Presence of Acyclic or Branched Perfluorocarbon Solvents

[0098] Solid form of LiF dispersed in liquid perfluoroheptane or range C 1 f 4 and C 6 f 14 to C 9 f 20 liquid in any acyclic perfluorocarbon.

[0099] The reaction that occurs is according to Reaction Equation 1:

[0100] The reaction temperature ranged from -94°C to 127°C.

[0101] The reaction pressure ranges from 0 kPa to 3000 kPa, more preferably up to 1000 kPa.

[0102] When will produce LiPF 6 dissolved in LiPF for solid form 6 When in a solvent, up to 99% LiPF can be achieved 6 Recovery rate, the solvent includes ethylene carbonate, propylene carbonate, dimethyl carbonate, dimethyl ether or any combination thereof.

Embodiment 3

[0103] Example 3: LiF and PF 5 Reactions of Gases in the Presence of Perfluorinated Aromatic Solvents

[0104] Dispersion of LiF in solid form in C 6 f 6 to C 10 f 8 In the range of liquid hexafluorobenzene or perfluorinated aromatic liquid compounds.

[0105] The reaction that occurs is according to Reaction Equation 1:

[0106] The reaction temperature ranges from 5°C to 100°C.

[0107] The reaction pressure ranges from 0 kPa to 3000 kPa, more preferably up to 1000 kPa.

[0108] When will produce LiPF 6 dissolved in LiPF for solid form 6 When in a solvent, up to 99% LiPF can be achieved 6 Recovery rate, the solvent includes ethylene carbonate, propylene carbonate, dimethyl carbonate, dimethyl ether or any combination thereof.

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Abstract

A method of producing solid lithium hexafluorophosphate (LiPF6) includes reacting lithium fluoride (LiF) in solid form with gaseous phosphorous pentafluoride (PF5) in a liquid perhalogenated organic compound that is non-reactive with, i.e. is inert to, the PF5, thereby producing LiPF6 in solid form.

Description

technical field [0001] The present invention relates to the production of lithium hexafluorophosphate. The present invention provides a method for producing lithium hexafluorophosphate and extends to lithium hexafluorophosphate produced according to the method. The invention also extends to a method of producing an electrolyte, and to electrolytes produced according to this method. The invention also provides a battery and a method for manufacturing the battery. Background technique [0002] It is known to use lithium hexafluorophosphate (LiPF 6 ) as the electrolyte. [0003] LiPF 6 The conventional preparation methods include wet chemical synthesis under aqueous reaction conditions and dry synthesis under non-aqueous conditions. [0004] Preparation of LiPF using wet chemical preparation method 6 Common methods include the synthesis of water-stable organic complexes, such as pyridinium or lithium tetraacetonitrile hexafluorophosphate, and the conversion of this comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00
CPCC01D15/005Y02E60/10H01M10/0568H01M6/166
Inventor 姆福·迪非戈·斯坦利·莱克高施约翰内斯·彼得鲁西·勒 鲁丹尼·塞洛·穆通
Owner ЗЕ САУС АФРИКАН НЮКЛИАР ЭНЕРДЖИ КОРПОРЕЙШЕН СОК ЛИМИТЕД
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