Preparation method of LiPF2 and lithium ion battery non-aqueous electrolyte containing LiPF2

A lithium difluorophosphate and lithium-ion battery technology, applied in the field of electronic chemicals, can solve the problems of easy formation of by-products, low yield, complicated operation, etc., and achieve the effect of excellent low temperature, high product purity, and simple purification

Active Publication Date: 2017-06-13
SHANDONG HIRONG POWER SUPPLY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has low yield, complicated operation and easy formation of by-products

Method used

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  • Preparation method of LiPF2 and lithium ion battery non-aqueous electrolyte containing LiPF2
  • Preparation method of LiPF2 and lithium ion battery non-aqueous electrolyte containing LiPF2
  • Preparation method of LiPF2 and lithium ion battery non-aqueous electrolyte containing LiPF2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Place the anhydrous selenic acid in a 2000mL hard glass or quartz flask with a mechanical stirring device, and add fluorosulfonic acid HSO 3 F, anhydrous selenic acid and HSO 3 The molar ratio of F is 1:10. Then install a reflux condenser tube (preferably a quartz condenser tube) on the flask. The tube is cooled by passing water. The upper outlet of the tube is connected with two cold traps frozen to -78℃ with a Teflon tube. Under vigorous stirring, it is slowly heated until it starts to reflux. The gas produced in the reaction condenses in the first cold trap, and the second cold trap serves to isolate the moisture in the air. After the gas evolution ceases (about 2h), the first cold trap is removed for fractional distillation, and it is distilled from the cold trap at -78°C to the cold trap at -196°C. After two distillations, the purity can be obtained. SeO 2 F 2 The product is collected for use, among which, anhydrous selenic acid and fluorosulfonic acid HSO 3 The rea...

Embodiment 2

[0039] Place the anhydrous selenic acid in a 2000mL hard glass or quartz flask with a mechanical stirring device, and add fluorosulfonic acid HSO 3 F, anhydrous selenic acid and HSO 3 The molar ratio of F is 1:8. Then install a reflux condenser tube (preferably a quartz condenser tube) on the flask. The tube is cooled by passing water. The upper outlet of the tube is connected with two cold traps frozen to -78℃ with a Teflon tube. Under vigorous stirring, it is slowly heated until it starts to reflux. The gas produced in the reaction condenses in the first cold trap, and the second cold trap serves to isolate the moisture in the air. When the gas evolution is stopped (about 2h), the first cold trap is removed for fractional distillation, and it is distilled from the cold trap at -78°C to the cold trap at -180°C. After two distillations, the purity can be obtained. SeO 2 F 2 Product collection for use, anhydrous selenic acid and fluorosulfonic acid HSO 3 The reaction temperature...

Embodiment 3

[0041] Place the anhydrous selenic acid in a 2000mL hard glass or quartz flask with a mechanical stirring device, and add fluorosulfonic acid HSO 3 F, anhydrous selenic acid and HSO 3 The molar ratio of F is 1:5. Then install a reflux condenser tube (preferably a quartz condenser tube) on the flask. The tube is cooled by passing water. The upper outlet of the tube is connected with two cold traps frozen to -78℃ with a Teflon tube. Under vigorous stirring, it is slowly heated until it starts to reflux. The gas produced in the reaction condenses in the first cold trap, and the second cold trap serves to isolate the moisture in the air. After the gas evolution ceases (about 2h), the first cold trap is removed for fractional distillation, and it is distilled from the cold trap at -78°C to the cold trap at -196°C. After two distillations, the purity can be obtained. SeO 2 F 2 The product is collected for use, among which, anhydrous selenic acid and fluorosulfonic acid HSO 3 The reac...

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Abstract

The invention relates to a preparation method of LiPF2 and a lithium ion battery non-aqueous electrolyte containing the LiPF2. The preparation of the LiPF2 comprises the following steps: introducing a SeOF2 gas in an organic solvent containing LiPF6 for reacting, and crystallizing, filtering and drying a product after completing the reaction, thus obtaining a LiPF2 product. The LiPF2 product prepared by the invention is high in purity, pollution of other metal ions does not exist, the product purity is 99.0 percent or more, the content of free acid (HF) is 70 ppm or less, and the content of an insoluble matter is 130 ppm or less. According to the preparation method disclosed by the invention, product purification is simple, and the high-purity LiPF2 product can be obtained through conventional steps of crystallizing, filtering and drying in the field; a lithium ion battery containing the lithium ion battery non-aqueous electrolyte has good low-temperature performance and good rate performance.

Description

[0001] (1) Technical field [0002] The field of electronic chemicals of the present invention specifically relates to a method for preparing lithium difluorophosphate and a lithium ion battery non-aqueous electrolyte containing lithium difluorophosphate. [0003] (2) Background technology [0004] With the technological development and commercialization of lithium-ion batteries, lithium-ion batteries are widely used in consumer electronics, power products, and energy storage products. In the next few years, lithium-ion batteries will become an expanding global industry. At the same time, with the expansion of its applicable fields, the requirements for further improvement of battery characteristics are getting higher and higher. [0005] Current studies have shown that adding lithium difluorophosphate to the electrolyte can improve the low-temperature characteristics, cycle characteristics, and storage characteristics of lithium-ion secondary batteries. As a method for preparing dif...

Claims

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Application Information

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IPC IPC(8): C01B25/455H01M10/0563
CPCC01B25/455C01P2006/40C01P2006/80H01M10/0563Y02E60/10
Inventor 刘子磊李立飞王吉峰刘永赵志华
Owner SHANDONG HIRONG POWER SUPPLY MATERIAL
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