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Joint production method of lithium difluoro-bis (oxalate) phosphate and lithium difluorophosphate

A technology of lithium difluorodioxalate phosphate and lithium difluorophosphate, which is applied in chemical instruments and methods, phosphorus compounds, phosphorus organic compounds, etc., can solve the problems that it is difficult to use as an additive for non-aqueous electrolyte batteries, and achieve the removal of chloride ions Effect

Pending Publication Date: 2022-04-12
王怀英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the chlorine concentration exceeds 5ppm or the acid concentration exceeds 250ppm, it is difficult to use as an additive for non-aqueous electrolyte batteries

Method used

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  • Joint production method of lithium difluoro-bis (oxalate) phosphate and lithium difluorophosphate
  • Joint production method of lithium difluoro-bis (oxalate) phosphate and lithium difluorophosphate
  • Joint production method of lithium difluoro-bis (oxalate) phosphate and lithium difluorophosphate

Examples

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Effect test

Embodiment 1

[0039] The method for the preparation of lithium difluorodioxalate phosphate and lithium difluorophosphate and the joint production device of this embodiment comprises the following steps:

[0040] 1) Prepare the following equipment and make devices that meet the requirements: lithium hexafluorophosphate preparation kettle, filter, reaction kettle, centrifuge, double cone drying equipment, etc.;

[0041] 2) dissolving lithium hexafluorophosphate in a carbonate solvent to obtain a lithium hexafluorophosphate solution, adjusting the temperature of the solution to 20° C., after the dissolution is completed, filter through a filter and transfer to a reaction kettle;

[0042] 3) Add oxalic acid to the above-mentioned lithium hexafluorophosphate solution to adjust the temperature of the solution to 20°C, add 10 kg of lithium hexafluorophosphate, the amount of oxalic acid added is based on the molar ratio of oxalic acid and lithium hexafluorophosphate of 1.9:1, gradually add additives...

Embodiment 2

[0072] The method for the preparation of lithium difluorodioxalate phosphate and lithium difluorophosphate and the joint production device of this embodiment comprises the following steps:

[0073] 1) Prepare the following equipment and make devices that meet the requirements: lithium hexafluorophosphate preparation kettle, filter, reaction kettle, centrifuge, double cone drying equipment, etc.;

[0074] 2) Dissolving lithium hexafluorophosphate in a carbonate solvent to obtain a lithium hexafluorophosphate solution, adjusting the temperature of the solution to 15° C., after the dissolution is completed, filter through a filter and transfer to a reaction kettle;

[0075] 3) Add oxalic acid to the above-mentioned lithium hexafluorophosphate solution to adjust the temperature of the solution to 15°C, add 10kg of lithium hexafluorophosphate, the amount of oxalic acid added is based on the molar ratio of oxalic acid and lithium hexafluorophosphate of 1.93:1, gradually add additives...

Embodiment 3

[0106] The method for the preparation of lithium difluorodioxalate phosphate and lithium difluorophosphate and the joint production device of this embodiment comprises the following steps:

[0107] 1) Prepare the following equipment and make devices that meet the requirements: lithium hexafluorophosphate preparation kettle, filter, reaction kettle, centrifuge, double cone drying equipment, etc.;

[0108] 2) dissolving lithium hexafluorophosphate in a carbonate solvent to obtain a lithium hexafluorophosphate solution, adjusting the temperature of the solution to 25° C., after the dissolution is completed, filter through a filter and transfer to a reaction kettle;

[0109] 3) Add oxalic acid to the above lithium hexafluorophosphate solution to adjust the temperature of the solution to 25°C, add 10kg of lithium hexafluorophosphate, the amount of oxalic acid added is based on the molar ratio of oxalic acid and lithium hexafluorophosphate of 1.96:1, gradually add additives for react...

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Abstract

The invention provides a joint production method of lithium difluorobisoxalato phosphate and lithium difluorophosphate. The joint production method comprises preparation of lithium difluorobisoxalato phosphate, preparation of lithium difluorophosphate and joint production equipment of the two substances, wherein main equipment comprises a lithium hexafluorophosphate preparation kettle, a filter, a reaction kettle, centrifugal separation equipment, drying equipment and the like; the device is provided with matched electrical instrument equipment.

Description

technical field [0001] The invention belongs to the field of new energy lithium ion battery material preparation technology and production equipment, and in particular relates to a joint production method of lithium difluorodioxalate phosphate and lithium difluorophosphate. Background technique [0002] Lithium difluorodioxalate phosphate, also known as lithium difluorobisoxalate phosphate, abbreviation: LiDODFP, CAS No.: 678966-16-0, chemical formula: LiPC 4 o 8 f 2 , used in lithium-ion battery additives, as a conductive substance. [0003] Lithium difluorophosphate, abbreviation: LiDFP, CAS No.: 24389-25-1, chemical formula: LiPO 2 f 2 , for lithium-ion battery additives to improve the performance of lithium-ion batteries. [0004] Both products are lithium-ion electrolyte additives. According to the application needs of lithium-ion batteries, the additives of the present invention are added to varying degrees. Both additives have conductive functions and can improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/09C01B25/455
Inventor 王笃涛
Owner 王怀英
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