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Preparation method of difluoro-lithium phosphate and lithium ion battery non-aqueous electrolyte

A technology of lithium difluorophosphate and non-aqueous electrolyte, which is applied in the field of electronic chemicals, can solve problems such as complex process, many by-products, and affecting batteries, and achieve the effects of high product purity, excellent performance, and cost reduction

Active Publication Date: 2015-03-25
ZHEJIANG KAISN FLUOROCHEM
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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, so it is not suitable for industrial production
Japanese Patent Laid-Open No. 2008-222484 using LiPF 6 Reaction with water to prepare lithium difluorophosphate, the reaction is not easy to control, will produce LiPO 4 F and other impurities that affect battery performance, and are not easy to purify, it is difficult to obtain high-purity products
[0004] It can be seen that there are various defects in the above-mentioned existing preparation methods, or the process is complicated, the cost is high, it is difficult to industrialize production, or the yield is low, there are many by-products, it is not easy to purify, and the prepared difluorophosphate has low purity, which affects product performance.

Method used

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  • Preparation method of difluoro-lithium phosphate and lithium ion battery non-aqueous electrolyte
  • Preparation method of difluoro-lithium phosphate and lithium ion battery non-aqueous electrolyte
  • Preparation method of difluoro-lithium phosphate and lithium ion battery non-aqueous electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0035] The first step reaction: under the protection of nitrogen atmosphere, first add pyrophosphate into the reactor, and then feed fluorine gas (F 2 ) to react, control the reaction temperature and the reaction time at the set value, and collect the generated gas in the gas cylinder for subsequent use. The reaction conditions are shown in Table 1.

[0036] The second step reaction: add lithium fluoride (LiF) to the reactor after nitrogen drying, control the temperature of the reactor at the set value, then pass anhydrous hydrogen fluoride solution into the reactor, start stirring to fully dissolve LiF in After the anhydrous hydrogen fluoride solution, the mixed gas obtained in the first step reaction is passed into the reactor for reaction. After the reaction, the reaction product is cooled and crystallized at -40°C, and then filtered in a nitrogen atmosphere glove box , the resulting crystals were dried at 180°C for 12 hours under the protection of nitrogen to obtain lithi...

Embodiment 6-10

[0038] The formula of the lithium ion battery non-aqueous electrolyte of lithium difluorophosphate is shown in Table 2, and its preparation method is as follows:

[0039] According to the formula, in a dry argon-protected glove box, add the electrolyte salt to the solvent, stir evenly, and then add the lithium difluorophosphate prepared in any one of Examples 1-5 to obtain a non-aqueous lithium ion battery electrolyte.

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Abstract

The invention provides a preparation method of difluoro-lithium phosphate. The preparation method comprises the following steps: reacting pyrophosphate with fluorine to generate a mixed gas; introducing the obtained mixed gas into an anhydrous hydrogen fluoride solution of lithium fluoride for reaction, and crystallizing, filtering and drying after the reaction to obtain a difluoro-lithium phosphate product. The invention also provides a lithium ion battery non-aqueous electrolyte containing the difluoro-lithium phosphate prepared by the method. The preparation method provided by the invention has the advantages of simple process, low cost and high product purity.

Description

technical field [0001] The invention relates to the field of electronic chemicals, in particular to a preparation method of lithium difluorophosphate and a nonaqueous electrolyte solution for lithium ion batteries. Background technique [0002] At present, driven by smart phones, mobile power supplies, tablet computers and other products, the output value of the domestic lithium battery industry continues to grow; at the same time, the application of lithium-ion batteries is no longer limited to consumer electronics products, power and energy storage are two new industries. The application direction brings unlimited market space for lithium batteries. Affected by the domestic lead pollution incident, domestic sales of lithium battery bicycles have grown rapidly, and Tesla electric vehicles have achieved quarterly profit for the first time, which has set off a "Tesla" fever in the global capital market; energy storage is driven by policies and stimulated by operators' network...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/455H01M10/0567
CPCY02E60/10
Inventor 王海张品杰周强
Owner ZHEJIANG KAISN FLUOROCHEM
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