Drying method and apparatus for lithium hexafluorophosphate

A technology of lithium hexafluorophosphate and drying equipment, which is applied in the field of lithium ion batteries, can solve the problems of HF cannot be effectively and quickly removed, the drying time of crystals is long, and the quality of products is affected. The effect of the content of

Active Publication Date: 2014-11-05
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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  • Drying method and apparatus for lithium hexafluorophosphate
  • Drying method and apparatus for lithium hexafluorophosphate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The drying method of lithium hexafluorophosphate in this embodiment includes the following steps: opening the inert gas inlet 13 and the exhaust gas outlet 14, feeding nitrogen from the inert gas inlet 13 for protection, and placing 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, the microwave generator 12 is turned on, the microwave controller 15 is adjusted to make the microwave frequency 865MHz, and the temperature monitoring and control device 16 is used to keep the temperature in the box 11 at 30 ℃, and the microwave radiation process contains HF waste gas Through the exhaust gas outlet 14, the duration of microwave irradiation was 60 minutes.

[0028] The schematic structural diagram of the lithium hexafluorophosphate drying equipment in this embodiment is as follows figure 1 As shown, it includes a sealable ...

Embodiment 2

[0032] The drying method of lithium hexafluorophosphate in this embodiment includes the following steps: firstly open the inert gas inlet 3 and the waste gas outlet 4, pass nitrogen from the inert gas inlet 3 for protection, then open the feed port 7, and add the lithium hexafluorophosphate to be dried from the feed port 7. , the drive motor drives the conveyor belt 8 to transfer the lithium hexafluorophosphate to be dried to the loading table 9 that rotates along the axis, and the scraper 13 evenly disperses the lithium hexafluorophosphate to be dried on the loading table 9, so that the thickness of the material layer is 25mm, open 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 keeps 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 continues...

Embodiment 3

[0037] The drying method of lithium hexafluorophosphate in this embodiment includes the following steps: firstly open the inert gas inlet 3 and the waste gas outlet 4, pass nitrogen from the inert gas inlet 3 for protection, then open the feed port 7, and add the lithium hexafluorophosphate to be dried from the feed port 7. , the drive motor drives the conveyor belt 8 to transfer the lithium hexafluorophosphate to be dried to the loading table 9 that rotates along the axis, and the scraper 13 evenly disperses the lithium hexafluorophosphate to be dried on the loading table 9, so that the thickness of the material layer is 20mm, open 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 keeps the temperature in the box 1 at 50°C. During the microwave radiation process, the waste gas containing HF is exported through the waste gas outlet 4, and the microwave radiation continues...

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Abstract

The invention discloses a drying method and apparatus for lithium hexafluorophosphate, which belongs to the technical field of lithium ion batteries. The method comprises a step of drying lithium hexafluorophosphate with microwave radiation under the protection of inert gas, wherein microwave frequency is 915 + / - 50 MHz, radiation time lasts for 10 to 60 min, and temperature is maintained to be 30 to 70 DEG C during radiation. According to the invention, lithium hexafluorophosphate is dried by using a microwave radiation method; since microwave drying does not need thermal conduction, lithium hexafluorophosphate generates heat by itself, a drying speed is fast, material contact temperature is substantially lower than that in a conventional method, and the phenomena of fission and decomposition of lithium hexafluorophosphate do not occur. Compared with a traditional heat drying method, microwave radiation drying enables drying time to be substantially shortened under the condition of a same drying degree, reduces the application amount of shielding gas, decreases the content of free acid in a product, effectively removes included HF, improves product quality and is more beneficial for production operation.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(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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