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A kind of mixture crystal containing lithium hexafluorophosphate and its application

A lithium hexafluorophosphate and mixture technology, which is applied in the field of mixture crystals containing lithium hexafluorophosphate, can solve the problems of no LiPF6 particle size crystal structure research, no related properties of hexafluorophosphate crystals, and insufficient utilization of raw materials, etc., to achieve dissolving heat and uniformity, Satisfies the requirements of high rate charge and discharge, and is conducive to the effect of dissolution

Active Publication Date: 2020-05-22
SINOCHEM LANTIAN +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] CN106745096A discloses a preparation method for preparing alkali metal hexafluorophosphate, including passing phosphorus pentafluoride gas and lithium fluoride solution into a microchannel reactor for reaction, crystallizing and drying the obtained reaction solution, and preparing lithium hexafluorophosphate, but The raw materials of this preparation method are not fully utilized, and there is no research on the properties of hexafluorophosphoric acid crystals
[0010] WO199062821A1 discloses a method for high-purity lithium hexafluorophosphate, a method for preparing high-purity, easy-flowing LiPF6 by crystallization from an organic solvent, wherein LiPF6 is crystallized from a solution in an aprotic organic solvent 1, and a second inert non- protic solvent, and essentially distilling off the first solvent, the obtained LiPF6 is characterized by a high crystal yield of over 80-90% and has good fluidity, but there is no influence on LiPF6 particle size, particle size distribution, crystal structure etc. for research, and the impurity content is high

Method used

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  • A kind of mixture crystal containing lithium hexafluorophosphate and its application
  • A kind of mixture crystal containing lithium hexafluorophosphate and its application
  • A kind of mixture crystal containing lithium hexafluorophosphate and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0046] The phosphorus pentachloride is transported to the phosphorus pentafluoride generator with a cooling jacket containing hydrogen fluoride through the solid conveyor with a metering device, and the temperature is controlled at about 0°C, and the phosphorus pentachloride reacts with hydrogen fluoride Production of 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 to form the first feed stream. Add 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, control the dissolution temperature to be about 0°C, and the mass fraction of lithium fluoride to be 2wt% . The hydrogen fluoride solution dissolved in lithium fluoride is pumped into the first microchannel reactor to form the second feed stream. The reaction temperature...

Embodiment 2

[0050] Prepare the mixture crystal containing lithium hexafluorophosphate according to the steps and conditions of Example 1, the difference is: the molar ratio of phosphorus pentafluoride to lithium fluoride in the first microchannel reactor is 2.5:1, and the molar ratio of phosphorus pentafluoride in the second microchannel reactor is 2.5:1. The molar ratio of phosphorus fluoride to lithium fluoride is 1:1.1.

[0051] The specific performance parameters of the prepared crystals are shown in Table 1.

Embodiment 3

[0053] The mixture crystals containing lithium hexafluorophosphate were prepared according to the steps and conditions of Example 1, except that the reaction temperature of the first microchannel reactor was 4° C., the residence time was 10 seconds, and the reaction temperature of the second microchannel reactor was 6° C. , with a dwell time of 12 seconds.

[0054] The specific performance parameters of the prepared crystals are shown in Table 1.

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Abstract

The invention relates to a lithium hexafluorophosphate-containing mixture crystal and applications thereof, wherein the lithium hexafluorophosphate-containing mixture crystal has an aspect ratio of 1-1.5 and an average particle size of 0.15-0.4 mm, the crystal plane group {110} accounts for 20-80% and the crystal plane group {111} accounts for 20-80% in more than 90% of the crystal, and the mixture crystal further comprises insoluble substances and free acids. According to the invention, the lithium hexafluorophosphate-containing mixture crystal is prepared by using a continuous hydrofluoric acid solvent method based on a micro-channel reactor; and the prepared crystal is high in lithium hexafluorophosphate content and low in impurity content, meets the industrial standard requirements, issmall in particle size, uniform in particle size distribution, uniform in crystal form structure and good in fluidity, is easily dissolved in an electrolytic solution, and further has low and uniformdissolution heat release.

Description

technical field [0001] The invention relates to lithium hexafluorophosphate, in particular to a mixture crystal containing lithium hexafluorophosphate and its application. Background technique [0002] Lithium hexafluorophosphate (LiPF6) is a white crystal or powder with a relative molecular mass of 151.91, a relative density of 1.50, and a melting point of 200°C. It is easily soluble in organic solvents such as water, ether, low-concentration methanol, and carbonates. One of the electrolytes with good performance for ion batteries. It is mainly used for lithium-ion power batteries, lithium-ion energy storage batteries, and other daily-use batteries such as lighting. It can also be used as a catalyst for organic synthesis reactions or as a semiconductor dopant. [0003] The electrolyte of lithium-ion batteries plays the role of conducting ions between the positive and negative electrodes. The capacity, internal resistance, rate, charge and discharge performance, operating te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/00H01M10/0563
CPCC01D15/005C01P2004/54C01P2004/60C01P2006/80C01P2006/82C01P2006/90H01M10/0563H01M2300/002Y02E60/10
Inventor 任建纲刘海岛马小红张海兵杨青陈慧闯章琪
Owner SINOCHEM LANTIAN