A drying method and equipment for lithium hexafluorophosphate

A technology of lithium hexafluorophosphate and drying method, which is applied in the field of lithium-ion batteries, can solve the problems that HF ​​cannot be removed effectively and quickly, the drying time of crystals is long, and the quality of products is affected, so as to facilitate production operations, shorten drying time, and reduce free acid The effect of content

Active Publication Date: 2016-06-22
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned thermal drying method is widely used, it takes a long time to dry the crystals, and there are defects such as incomplete drying. The HF in the product cannot be removed effectively and quickly, thereby affecting the quality of the product.

Method used

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  • A drying method and equipment for lithium hexafluorophosphate
  • A drying method and equipment for lithium hexafluorophosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The drying method of lithium hexafluorophosphate in this embodiment includes the following steps: open the inert gas inlet 13 and the waste gas outlet 14, pass nitrogen gas into the inert gas inlet 13 for protection, place the lithium hexafluorophosphate to be dried in a dispersed state in the box 11 of the lithium hexafluorophosphate drying equipment , the thickness of the lithium hexafluorophosphate material layer is 10mm, turn on the microwave generator 12, adjust the microwave controller 15 to make the microwave frequency 865MHz, use the temperature monitoring and control device 16 to keep the temperature in the box 11 at 30°C, and the microwave radiation process contains HF waste gas Conducted through the exhaust gas outlet 14, the duration of microwave irradiation is 60 minutes.

[0028] The structural representation of lithium hexafluorophosphate drying equipment in this embodiment is as follows figure 1 As shown, it includes a closeable box body 11 and a microwa...

Embodiment 2

[0032] The drying method of lithium hexafluorophosphate in this embodiment comprises the following steps: first open the inert gas inlet 3 and the waste gas outlet 4, pass nitrogen gas into the inert gas inlet 3 for protection, then open the feed port 7, and add lithium hexafluorophosphate to be dried from the feed port 7 , the driving motor drives the conveyor belt 8 to transfer the lithium hexafluorophosphate to be dried to the loading platform 9 rotating along the axis, and the scraper 13 disperses the lithium hexafluorophosphate to be dried evenly on the loading platform 9, so that the thickness of the material layer is 25mm. The microwave generator 2 uses the microwave controller 5 and the temperature monitoring and control device 6 to adjust the microwave frequency to 915MHz, and maintains the temperature in the box 1 at 70°C. During the microwave radiation process, the HF-containing waste gas is exported through the waste gas outlet 4, and the microwave radiation continue...

Embodiment 3

[0037] The drying method of lithium hexafluorophosphate in this embodiment comprises the following steps: first open the inert gas inlet 3 and the waste gas outlet 4, pass nitrogen gas into the inert gas inlet 3 for protection, then open the feed port 7, and add lithium hexafluorophosphate to be dried from the feed port 7 , the driving motor drives the conveyor belt 8 to transfer the lithium hexafluorophosphate to be dried to the loading platform 9 rotating along the axis, and the scraper 13 disperses the lithium hexafluorophosphate to be dried evenly on the loading platform 9, so that the thickness of the material layer is 20mm. The microwave generator 2 uses the microwave controller 5 and the temperature monitoring and control device 6 to adjust the microwave frequency to 965MHz, and maintains the temperature in the box 1 at 50°C. During the microwave radiation process, the HF-containing waste gas is exported through the waste gas outlet 4, and the microwave radiation continue...

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Abstract

The invention discloses a lithium hexafluorophosphate drying method and equipment, belonging to the technical field of lithium ion batteries. The method comprises the following steps: using microwave radiation to dry lithium hexafluorophosphate under the protection of inert gas, the microwave frequency is 915±50 MHz, the time is 10 to 60 minutes, and the temperature is kept at 30 to 70 DEG C during the radiation. The present invention adopts the microwave radiation method to dry lithium hexafluorophosphate, mainly because microwave drying does not require heat conduction, the material itself generates heat, the drying speed is fast, and the temperature of contacting the material is much lower than the conventional method, which will not cause material fission and decomposition. Compared with the traditional thermal drying method, microwave radiation drying can greatly shorten the drying time and reduce the amount of protective gas under the same drying degree, while reducing the content of free acid in the product, effectively removing HF inclusions, improving product quality, and more conducive to production operations .

Description

technical field [0001] The invention specifically relates to a drying method for lithium hexafluorophosphate and drying equipment used for implementing the method, and belongs to the technical field of lithium ion batteries. Background technique [0002] Lithium hexafluorophosphate is an important electrolyte used in lithium-ion secondary batteries at present, and lithium-ion secondary batteries are currently recognized as an ideal green energy source. Its small size and large capacity have been widely used. The performance of the electrolyte prepared by lithium hexafluorophosphate and organic carbonate solvents directly affects the charge and discharge capacity, cycle life and safety of the lithium-ion secondary battery; due to its strong hygroscopicity, it is easily decomposed in the air , the preparation conditions are very strict, and the packaging and storage environment also have strict requirements. [0003] There are three main methods for synthesizing lithium hexaf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/455F26B3/347
Inventor 李云峰侯红军李世江杨华春李凌云薛旭金闫春生于贺华刘海庆
Owner DO FLUORIDE CHEM CO LTD
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