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Composition containing LiPF6 crystals and water

A technology of composition and moisture, which is applied in the direction of lithium hexafluorophosphate, lithium compounds, alkali metal compounds, etc., can solve the problems of high cost and the purity of undisclosed lithium hexafluorophosphate products, and achieve the effects of low cost, high product quality stability and sufficient reaction

Active Publication Date: 2020-02-07
SINOCHEM LANTIAN +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the highest yield of lithium hexafluorophosphate product in this patent is only 98.5%, and pure phosphorus pentafluoride gas is used, the cost is high, and the specific purity of lithium hexafluorophosphate product is not disclosed

Method used

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  • Composition containing LiPF6 crystals and water
  • Composition containing LiPF6 crystals and water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058]The water content in the anhydrous hydrogen fluoride was reduced to 8 ppm by the F2 bubbling method. The foaming time is 2 hours, the temperature is -20°C, and the F2 flow rate is 20g / hr. The phosphorus pentachloride is transported to the phosphorus pentafluoride generator 2 with anhydrous hydrogen fluoride with a cooling jacket through the solid conveyor 1 with a metering device, and the temperature is controlled at about 0°C, and the phosphorus pentachloride That is, react with anhydrous hydrogen fluoride to produce phosphorus pentafluoride and hydrogen chloride. The mixed gas of phosphorus pentafluoride, hydrogen chloride and entrained hydrogen fluoride gas is passed into the first microchannel reactor 3 to form the first feed stream. Add anhydrous hydrogen fluoride into the dissolution tank with cooling jacket and agitator, and add lithium fluoride into the dissolution tank with a solid feeding device while cooling, and control the dissolution temperature to about 0...

Embodiment 2

[0061] The difference between the production process of Example 2 and Example 1 is that heat treatment is performed after drying and deacidification in the drying system, and the dried product is supplied to a heating furnace. The inside of the heating furnace was evacuated and filled with phosphorus pentafluoride gas. The heating time was 2 hours, the temperature was 98° C., the pressure was atmospheric pressure, cooled to room temperature, and the inside of the container was evacuated to obtain the composition. After testing, in the generated composition, the lithium hexafluorophosphate crystal content is 99.9952%, the moisture content is 2ppm, 45% of the crystal particle size is greater than or equal to 0.2mm and less than 0.25mm, and 45% of the crystal particle size is greater than or equal to 0.25mm and less than or equal to 0.3 mm.

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Abstract

The invention relates to a composition which comprises LiPF6 crystals and water, the particle size distribution of the LiPF6 crystals is uniform, the particle size of 35-50% of the crystals is largerthan or equal to 0.2 mm and smaller than 0.25 mm, the particle size of 35-50% of the crystals is larger than or equal to 0.25 mm and smaller than or equal to 0.3 mm, and the water content is lower than 8 ppm. The product disclosed by the invention is high in stability, high in consistency, high in purity and low in moisture content, and a lithium ion battery prepared by using the product as an electrolyte component is excellent in performance.

Description

technical field [0001] The invention relates to the field of lithium ion battery electrolytes, in particular to a composition containing lithium hexafluorophosphate crystals and water. Background technique [0002] LiPF6 is widely used as an electrolyte material for lithium-ion batteries due to its high electrical conductivity. LiPF6 is very easy to hydrolyze and deteriorate. The battery performance with LiPF6 as the electrolyte is also closely related to the water content. Water is a protic compound. During the initial discharge process of the battery, it will destroy the stability of the SEI film and reduce the conductivity of Li+. The reaction will cause the content of hydrofluoric acid to increase and deteriorate the performance of the battery. Therefore, the water content is an important technical indicator in the quality standard of LiPF6 products. [0003] CN102910612A discloses a kind of preparation method of lithium hexafluorophosphate, under normal temperature, ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00H01M10/0563
CPCC01D15/005H01M10/0563C01P2006/82C01P2004/60C01P2004/51C01P2006/80Y02E60/10
Inventor 任建纲刘海岛马小红张海兵杨青章琪陈慧闯
Owner SINOCHEM LANTIAN
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