Method of manufacturing electrolyte solution for lithium ion battery and lithium ion battery using it

一种电解质溶液、锂离子电池的技术，应用在锂离子电池领域，能够解决费用降低等问题

Active Publication Date: 2008-11-19
CENT GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are still many problems such as difficulty in making the cost significantly lower in the preparation of the electrolytic solution

Method used

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Examples

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preparation example Construction

[0015] In the preparation method of the present invention, at first phosphorus trichloride and lithium chloride as raw materials are added in the non-aqueous organic solvent, and chlorine gas is blown into the solvent so as to react in the non-aqueous organic solvent, and then Hydrogen fluoride is introduced into the solvent containing the reaction product, thereby causing it to react with the reaction product.

[0016] In the present invention, the molar ratios of lithium chloride, chlorine and phosphorus trichloride are 1-1.1:1:1-2, respectively. Phosphorus trichloride must be added in the same or greater amount than chlorine gas. This is because if the amount of chlorine gas is greater than that of phosphorus trichloride, the excess chlorine gas reacts with the solvent to generate impurities. Therefore, it is necessary to add phosphorus trichloride in an amount 1 to 2 times the amount of chlorine gas. In consideration of raw material costs, the amount of lithium chloride ...

Embodiment 1

500 g of dimethyl carbonate, 72 g of phosphorus trichloride, and 21 g of lithium chloride were added to the polytetrafluoroethylene reactor, followed by stirring and dispersion. For this, the reactor is a polytetrafluoroethylene reactor with a light-shielding treatment. While maintaining the dispersed solution at 10°C, 35.5 g of chlorine gas was introduced. In this introduced solution, solid matter was dissolved, and it became a light yellow solution, and lithium hexachlorophosphate was formed by the progress of this reaction. Into the obtained solution was introduced 66 g of anhydrous hydrogen fluoride while maintaining it at 10°C. The solution after introduction turned from light yellow to colorless, and lithium hexafluorophosphate was formed.

[0033] Then, excess hydrogen fluoride in the resulting solution was converted to hydrogen chloride and lithium fluoride by adding lithium chloride again, and they were removed by vacuum treatment together with hydrogen chloride and ...

Embodiment 2

500 g of diethyl carbonate, 72 g of phosphorus trichloride, and 21 g of lithium chloride were charged into the polytetrafluoroethylene reactor, followed by stirring and dispersion. For this, the reactor is a polytetrafluoroethylene reactor with a light-shielding treatment. While maintaining the dispersed solution at 10°C, 35.5 g of chlorine gas was introduced. In this introduced solution, solid matter was dissolved, and it became a light yellow solution, and lithium hexachlorophosphate was formed by the progress of this reaction. Into the obtained solution was introduced 66 g of anhydrous hydrogen fluoride while maintaining it at 10°C. The solution after introduction turned from light yellow to colorless, and lithium hexafluorophosphate was formed.

[0036] Then, excess hydrogen fluoride in the resulting solution was converted to hydrogen chloride and lithium fluoride by adding lithium chloride again, and they were removed by vacuum treatment together with hydrogen chloride a...

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Abstract

Disclosed is a method for producing an electrolyte solution for lithium ion batteries which uses lithium hexafluorophosphate as the electrolyte. This method does not use an anhydrous hydrogen fluoride solvent which is hard to handle, or require expensive equipment or complicated operations. In addition, this method enables to produce an electrolyte solution using lithium hexafluorophosphate as the electrolyte at low cost without performing a crystallization process. Also disclosed is a lithium ion battery using an electrolyte solution obtained by such a method. Specifically disclosed is a method for producing an electrolyte solution for lithium ion batteries using lithium hexafluorophosphate as the electrolyte, which comprises a step wherein phosphorus trichloride, chlorine and lithium chloride are reacted in a nonaqueous organic solvent, and another step wherein the reaction product produced in the solvent is reacted with hydrogen fluoride.

Description

technical field [0001] The present invention relates to a method for producing an electrolyte solution for a lithium ion battery using lithium hexafluorophosphate as an electrolyte, and to a lithium ion battery using the electrolyte solution. Background of the invention [0002] Various methods have been proposed for producing lithium hexafluorophosphate, which is an electrolyte for lithium ion batteries and the like. As a general electrolyte solution preparation, lithium hexafluorophosphate is firstly prepared in the implemented method, and dissolved in a predetermined lithium battery solvent to prepare an electrolyte solution. Regarding the method of producing lithium hexafluorophosphate, for example, there is a method (Patent Document 1) in which solid lithium fluoride and gaseous phosphorus pentafluoride are reacted without a solvent. In this method, there is a risk that a film of a reaction product is formed on the surface of lithium fluoride, so that the reaction does...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40C01B25/455H01M10/0568
CPCH01M10/0568C01D15/005Y02E60/10H01M10/05C01B25/455
Inventor 佐藤敬二大江周
Owner CENT GLASS CO LTD
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