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Low-chloride electrolyte

A technology for chloride ions and chloride ion content, applied in non-aqueous electrolytes, non-aqueous electrolyte batteries, circuits, etc., can solve problems such as inability to meet purity requirements

Inactive Publication Date: 2015-12-09
LANXESS DEUTDCHLAND GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The prior art shows that achieving high purity of lithium hexafluorophosphate and especially keeping the chloride ion content low is technically very complex
The hitherto known methods for preparing lithium hexafluorophosphate are therefore not able to meet every purity requirement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example

[0173] In the following, the symbols "%" and "ppm" are always understood to mean % by weight and "ppm by weight", respectively.

[0174] "Inert gas conditions" or inert gas means that the water and oxygen content of the atmosphere is below 1 ppm.

[0175] Determination of chloride ion and hexafluorophosphate content:

[0176]For the ion chromatography method used in the context of this work, reference publication, L. Terborg, S. Nowak, S. Passerini, M. Winter, U. Karst, P. R. Haddad, P. N. Nesterenko, Hydrolysates of hexafluorophosphate Ion chromatographic determination of hydrolysis products of hexafluorophosphate salts in a queous solution, Analytica Chimica Acta 714 (2012) 121 - 126 and references cited therein.

[0177] Analysis of the chloride and hexafluorophosphate ions present was performed by ion chromatography. For this purpose, the following instruments and settings were used:

[0178] Instrument type: DionexICS2100

[0179] column: AS202*250-mm "Analytical co...

example 1

[0211] Example 1: Preparation of lithium hexafluorophosphate (saturated) in acetonitrile

[0212] 250 ml of acetonitrile and 25.61 g of lithium fluoride were charged at room temperature into a 500 ml Teflon apparatus filled with argon. Into the resulting suspension were introduced first 180 g of hydrogen chloride gas and then 186.58 g of gaseous phosphorus pentafluoride. The obtained reaction mixture was stirred for one hour. The reaction mixture was filtered and the solid obtained was blown dry under a flow of argon. This yielded 153 g of solid (44% yield).

[0213] Characterization of solids:

example 2

[0214] Example 2: Preparation of lithium hexafluorophosphate in acetonitrile and subsequent precipitation with toluene

[0215] 250 ml of acetonitrile and 6.49 g of lithium fluoride were charged at room temperature into a 500 ml Teflon apparatus filled with argon. Into the resulting suspension were introduced first 27.35 g of hydrogen chloride gas (chloride ion content of the suspension after introduction: 12.1% by weight) and then 47.24 g of gaseous phosphorus pentafluoride. The obtained reaction mixture was stirred for one hour. The reaction mixture is metered into 500 ml of toluene. The precipitated solid was filtered off and blown dry under a stream of argon. This yielded 34.7 g of solid (91% yield).

[0216] Characterization of solids:

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Abstract

The present invention relates to a method for producing low-chloride lithium hexafluorophosphate starting from lithium fluoride and phosphorus pentafluoride and the use thereof in an electrolyte.

Description

technical field [0001] The present invention relates to a process for the preparation of low-chloridelithium hexafluorophosphate starting from lithium fluoride and phosphorus pentafluoride and its use in electrolytes. Background technique [0002] The global spread of portable electronic devices, such as laptop and palmtop computers, mobile phones or video cameras, and thus also the demand for lightweight and high-performance batteries and accumulators, has increased considerably over the past few years. This will increase in the future by equipping electric vehicles with accumulators and batteries of this type. [0003] Lithium hexafluorophosphate (LiPF 6 ) has acquired high industrial significance especially as a conductive salt in the production of high-performance accumulators. In order to guarantee the functional capacity and lifetime of such accumulators and thus their quality, it is particularly important that the lithium compounds used contain a minimum proportion ...

Claims

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Application Information

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IPC IPC(8): C01D15/00H01M10/0561
CPCC01D15/005C01P2006/80H01M10/0568Y02E60/10C01P2006/40H01M10/052H01M2300/0017
Inventor 托马斯·林德马蒂亚斯·博尔埃伯哈德·库克特
Owner LANXESS DEUTDCHLAND GMBH
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