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Lithium perchlorate electrolyte solution and preparation method thereof

An electrolyte solution and lithium perchlorate technology, applied in the field of lithium ion batteries, can solve the problems of low solubility of lithium carbonate, difficult filtration, large equipment investment, etc., and achieve the effect of reducing the solid drying process, the preparation method is simple, and the degree of danger is reduced

Active Publication Date: 2019-08-02
江苏蓝固新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the neutralization method has the disadvantages of high impurity content and high water content. At the same time, the lithium carbonate neutralization method is used, because of the low solubility of lithium carbonate, there are also disadvantages such as long neutralization reaction time with perchloric acid, slow speed, and difficult filtration.
The sodium content of the double decomposition method is high, the product purity is low, and the low-temperature selective crystallization method is used to remove sodium chloride as a by-product, and it is difficult to completely remove sodium chloride
The electrolysis method consumes a lot of energy, equipment investment and cost are high

Method used

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  • Lithium perchlorate electrolyte solution and preparation method thereof

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Embodiment 1

[0029] A preparation method of lithium perchlorate electrolyte solution, comprising the steps of: adding 50g of lithium chloride and 80g of sodium perchlorate into a reaction kettle, then adding 182mL of ethylene glycol dimethyl ether solution, the reaction temperature is 100°C, and stirring 3h, feed the inert gas argon to remove excess water, filter to remove the sodium chloride by-product insoluble in ethylene glycol dimethyl ether, evaporate the ethylene glycol dimethyl ether solvent, and return to the reaction kettle through reflux condensation, and the filtrate is again Return to the reaction kettle for secondary reaction until no precipitation occurs, heat the obtained filtrate to 80°C, then cool to 0°C and filter to remove unreacted sodium perchlorate, then filter the filtrate through 4A molecular sieves to remove the solvent Impurities and moisture in the solution, the lithium perchlorate finally obtained accounts for 30% of the mass percent content of the ethylene glyc...

Embodiment 2

[0032] A preparation method of lithium perchlorate electrolyte solution, comprising the steps of: adding 50g of lithium chloride and 80g of sodium perchlorate into a reaction kettle, then adding 182mL of diethyl carbonate solution, the reaction temperature is 140°C, stirring for 3h, Pass in the inert gas argon to remove excess water, filter to remove the sodium chloride by-product insoluble in diethyl carbonate, evaporate the diethyl carbonate solvent, return to the reaction kettle through reflux condensation, and return the filtrate to the reaction kettle again for secondary Reaction until no precipitation occurs, heat the obtained filtrate to 80°C, then cool to 0°C and filter to remove unreacted sodium perchlorate, then filter the filtrate through 4A molecular sieves to remove impurities and water in the solvent , the finally obtained lithium perchlorate accounts for 35% of the mass percentage of dimethyl carbonate solution, and the contents such as moisture and impurities in...

Embodiment 3

[0035] A preparation method of lithium perchlorate electrolyte solution, comprising the steps of: adding 60g of lithium bromide and 96g of sodium perchlorate into a reaction kettle, then adding 218mL of ethylene glycol dimethyl ether solution, the reaction temperature is 100°C, stirring for 3h, Pass in inert gas argon to remove excess water, lower the temperature to 51°C, filter out the precipitated sodium bromide by-product, evaporate the ethylene glycol dimethyl ether solvent, return to the reaction kettle after reflux condensation, and return the filtrate to the reaction vessel again Carry out a secondary reaction in the kettle until no precipitation occurs, heat the obtained filtrate to 80°C, then cool to 0°C and filter to remove unreacted sodium perchlorate, then filter the filtrate through 4A molecular sieves to remove Impurities and moisture, finally obtained lithium perchlorate accounts for 10% of the mass percent content of ethylene glycol dimethyl ether solution, and ...

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Abstract

The invention provides a preparation method for a lithium perchlorate electrolyte solution. The method comprises the following steps: a lithium source and perchlorate are added to an organic solvent,heating to react is then carried out, an inert gas is supplied to remove water in the solvent, filtering to remove solvent-insoluble salt by-products, the filtrate passes through a molecular sieve toremove impurities and water, and thus, the lithium perchlorate electrolyte solution is obtained. In the lithium perchlorate electrolyte solution preparation method, a common aqueous solution is replaced by an electrolyte common ester or ether solvent, a solid drying process is reduced, the generated by-products are insoluble in the used ester or ether and are filtered and removed, no water is generated during the reaction process, and with water removal and various drying processes, the water content of the final product is very low, and the product after filtering, drying and impurity removalcan be directly used for subsequent electrolyte configuration.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a lithium perchlorate electrolyte solution and a preparation method thereof. Background technique [0002] With the continuous development of the national economy, the required energy consumption has increased sharply, and the development of clean energy is urgent. The clean energy represented by solar energy and tidal energy is greatly affected by environmental factors. The use of energy storage equipment can make more efficient use of these New energy, so the research and development of energy storage equipment is extremely valuable. Lithium-ion batteries stand out from secondary batteries due to their high output power, high energy density, high operating voltage, and long cycle life. They are currently the most ideal energy storage equipment. [0003] As an important part of lithium-ion batteries, electrolyte lithium salt not only provides ions for free shuttle transmissi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0525
CPCH01M10/0525H01M10/0568H01M2300/0025Y02E60/10
Inventor 李立飞周玉梅黄建
Owner 江苏蓝固新能源科技有限公司
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