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Purification method of lithium hexafluorophosphate

A technology of lithium hexafluorophosphate and purification method, which is applied in the field of purification of lithium hexafluorophosphate, can solve the problems of ineffective removal and affect the charging and discharging performance of batteries, and achieves the effect of improving performance

Inactive Publication Date: 2016-04-13
黄铭 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology helps control how well Lithium hexaphospliphosphate (LiP) crystallizes out during synthesis or processing steps without affecting its quality. It also removes unwanted substances like oxygen and water that may be harmful when used with batteries made by other materials.

Problems solved by technology

This patented technical solution discusses various techniques aimed at producing pure or near-zero-valence lithium hexaphosphazene oxide (LIO) from lithiumsulfonates. Lixpanthafluoroantimony trilobalt fluorite (LBO), another type of material commonly found around us today, plays a role similar to other metals like iron but without any harmful effects towards future generations' use. Additionally, there may exist different types of nonvolatile memory elements called solid state memories (SSM). These SSM require highly pure lithia hexafluorozoan cathode plating solutions containing lithiusis salt.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The purification method for purifying lithium hexafluorophosphate in Example 1 includes the following steps: in an environment with a moisture content of 50PPM glove box [nitrogen protection], take 100 g of crude lithium hexafluorophosphate crystals with a content of 30% in a 1L Erlenmeyer flask, and follow the procedure for the crude lithium hexafluorophosphate crystals Add diethyl carbonate [moisture content 50-100ppm, purity 99%, temperature 0-10°C] at a ratio of 1:4 and slowly add diethyl carbonate [control the dissolution temperature at 10-20°C], magnetically stir for 1 hour Afterwards, it was aged for 2 hours and filtered to obtain 400ml of transparent solution. Slowly add petroleum ether [moisture content of 50ppm, purity greater than 98%, boiling range of 60-90°C] into the solution at a ratio of 1:4, stir and react, age for 4 hours, and remove the supernatant after the nucleation and crystallization of lithium hexafluorophosphate , and filtered to obtain crystal...

Embodiment 2

[0022] The purification method for purifying lithium hexafluorophosphate in Example 2 includes the following steps: in a glove box [nitrogen protection] environment with a moisture content of 50PPM, take 100 g of crude lithium hexafluorophosphate crystals with a content of 10% in a 1L Erlenmeyer flask, according to the crude product of lithium hexafluorophosphate and Ethylene glycol monomethyl ether [moisture content 50-100ppm, purity 98%, temperature 0-10°C] = 1:5 ratio slowly add ethylene glycol monomethyl ether [control the dissolution temperature at 10-20°C], After magnetic stirring until completely dissolved, age for 2 hours and filter to obtain 500ml of transparent solution. Slowly add n-hexane [moisture content of 50ppm, purity greater than 98%] into the solution at a ratio of 1:1, stir and react, and age for 3 hours. After lithium hexafluorophosphate nucleates and crystallizes, remove the supernatant and filter to obtain crystals. Repeat the above process 3 times. At ...

Embodiment 3

[0024] The purification method for purifying lithium hexafluorophosphate in Example 3 includes the following steps: in a glove box [nitrogen protection] environment with a moisture content of 50PPM, take 100 g of crude lithium hexafluorophosphate crystals with a content of 30% in a 1L Erlenmeyer flask, and use the crude product of lithium hexafluorophosphate and Diethyl ether [moisture content 50-100ppm, purity 98%, temperature 0-10°C], slowly add ether at a ratio of 1:10 [control the dissolution temperature at 20-25°C], magnetically stir until completely dissolved, and age After 2h, filter to obtain 1000ml of transparent solution. Slowly add hexane [moisture content: 50ppm, purity: 98%] into the solution at a ratio of 1:2, stir and react, and age for 3 hours. After lithium hexafluorophosphate nucleates and crystallizes, remove the supernatant and filter to obtain crystals; repeat the above Process 3 times. Vacuum drying at a low temperature of -10°C to obtain high-purity lit...

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Abstract

The invention discloses a lithium hexafluorophosphate purifying method which comprises the following steps: 1) dissolving a crude product of lithium hexafluorophosphate in a carbonic ester and/or ester solvent at 0-40 DEG C, and filtering the dissolution liquid to obtain transparent liquid; 2) adding alkane and/or ester solvent of which the volume is 0.1-10 times that of the transparent liquid into the transparent liquid, and mixing and stirring so that the lithium hexafluorophosphate is nucleated and crystallized in the mixed solvent; 3) aging for 0.5-24 hours, and filtering the mixed solution to obtain a lithium hexafluorophosphate crystal; 4) at least repeating the steps 1) to 3) once; and 5) vacuumizing and drying at a low temperature of (-40)-90 DEG C to obtain high-purity lithium hexafluorophosphate. The method disclosed by the invention can be used for effectively removing inorganic and organic impurities in the lithium hexafluorophosphate, and greatly improving the property of the lithium hexafluorophosphate as an electrolyte.

Description

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Claims

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Application Information

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Owner 黄铭
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