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Preparation method of lithium difluorophosphate and byproduct treatment method

A technology of lithium difluorophosphate and processing method, which is applied in phosphorus compounds, alkali metal fluorides, chemical instruments and methods, etc., can solve the problem of high production cost of lithium difluorophosphate, unsuitable for large-scale manufacturing, low utilization rate of raw materials, etc. problem, to achieve the effect of easy separation and purification, fast speed, safe and stable reaction

Inactive Publication Date: 2020-11-27
山东森诺威新能源有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method uses dangerous goods such as fluorine gas and phosphorus pentoxide as reaction raw materials, which has high requirements on equipment, and the utilization rate of raw materials is low, resulting in high production cost of lithium difluorophosphate, so it is not suitable for large-scale production

Method used

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  • Preparation method of lithium difluorophosphate and byproduct treatment method
  • Preparation method of lithium difluorophosphate and byproduct treatment method
  • Preparation method of lithium difluorophosphate and byproduct treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0045] 1. Synthesis of lithium difluorophosphate

[0046] The reaction principle is that lithium hexafluorophosphate and siloxane react in a benign non-aqueous solvent, and the reaction equation is:

[0047]

[0048] Among them, R 1 and R 2 Both are methyl. The benign non-aqueous solvent required for the reaction is dimethyl carbonate.

[0049] The reaction process is as figure 1 As shown, the specific steps are as follows:

[0050] (1) Preparation of solution

[0051] Open the nitrogen valve and vent valve of the solution preparation kettle to maintain a slight nitrogen protection. Open the nitrogen valve on the dimethyl carbonate (DMC) storage tank, open the discharge valve, accurately measure and put an appropriate amount of solvent into the blending kettle, and start stirring, and control the temperature in the kettle to maintain at 5-25°C.

[0052] Connect the pipeline between the mixing kettle and the lithium hexafluorophosphate container. Open the solid feedi...

Embodiment 5-9

[0085] The specific experimental steps are the same as in Examples 1-4, except that the type of reaction solvent is changed. The experimental parameters involved in the experimental process of Examples 5-9 and the yield of the final product are specifically shown in Table 2:

[0086] Experimental parameters involved in the experimental process of table 1 and the yield of final product

[0087]

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Abstract

The invention relates to the technical field of materials for lithium batteries, in particular to a preparation method of lithium difluorophosphate and a byproduct treatment method. The method specifically comprises the following steps of: synthesizing LiPO2F2; crystallizing and purifying; filtering and drying a finished product; and carrying out by-product treatment to obtain high-added-value by-products. Through the reaction process, the inventor adopts a special catalyst and process, the reaction is safe and stable, the speed is high, intermediate materials and solvents are fully recycled and reused in the reaction process, the material consumption is low, and the method is environment-friendly; meanwhile, the product is easy to separate and purify, simple in process preparation and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a preparation method of lithium difluorophosphate and a by-product treatment method. Background technique [0002] At present, lithium batteries have been widely used in portable tools, notebook computers, mobile communications, electric vehicles and many other fields due to their advantages such as high energy density, high working voltage, small self-discharge, long cycle life, no memory effect, and no pollution. Electrolyte is an important part of lithium batteries, and its comprehensive performance is of great significance to the overall performance of lithium batteries. [0003] At present, the basic formula of lithium battery electrolyte is composed of lithium hexafluorophosphate and organic solvents. However, lithium hexafluorophosphate is sensitive to water, easy to hydrolyze, and has poor thermal stability, easy to thermally decompose. Lithium salts co...

Claims

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Application Information

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IPC IPC(8): C01B25/455C01D3/02C07F7/08C07F7/12
CPCC01B25/455C01D3/02C07F7/0836C07F7/126
Inventor 李法强上官雪慧王青磊
Owner 山东森诺威新能源有限公司
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