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Organic electrolysis solution purification process for lithium ionic cell

A technology of organic electrolyte and lithium-ion battery, which is applied in the field of refining the organic electrolyte of lithium-ion batteries, can solve problems such as reduction, and achieve the effect of reducing the concentration of lithium ions

Active Publication Date: 2009-06-10
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the defect that the existing refining method can greatly reduce the concentration of lithium ions in the organic electrolyte of lithium ion batteries, and provide a method for refining the organic electrolyte that has little influence on the concentration of lithium ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This example is used to illustrate the refining method of the lithium ion battery organic electrolyte provided by the present invention.

[0039] (1) Contains -SO 3 Preparation of Lithium-Type Cation Exchange Resin with Li Active Group

[0040] will contain -SO 3 The styrene-based cation exchange resin (Shanghai Resin Factory Co., Ltd. D001 type) of the H active group and the LiCl solution with a concentration of 4% by weight contacted at 40°C for 4 hours at a volume ratio of 1:9 and filtered, and then used 4% by weight Wash the obtained solid with LiCl solution until the pH value of the washing solution is neutral, then wash the obtained solid with water to remove the residual soluble lithium salt in the solid, and then dry at 65°C for 14 hours under 0 Pa absolute pressure to obtain the present invention. containing -SO 3 Lithium-type cation exchange resin with Li active groups.

[0041] By weighing 10 g of lithium containing -SO 3 Lithium type cation exchange res...

Embodiment 2

[0045] This example is used to illustrate the refining method of the lithium ion battery organic electrolyte provided by the present invention.

[0046] (1) Contains -SO 3 Preparation of Lithium-Type Cation Exchange Resin with Li Active Group

[0047] will contain -SO 3 The styrene-based cation-exchange resin (Shanghai Resin Factory Co., Ltd. D001 type) of the H active group and the LiCl solution with a concentration of 2% by weight contacted at 20°C for 7 hours in a volume ratio of 1:13 and filtered, and then used 4% by weight Wash the obtained solid with LiCl solution until the pH value in the washing solution is neutral, then wash the obtained solid with water to remove the residual soluble lithium salt in the solid, and then dry at 70°C for 12 hours under an absolute pressure of 250 Pa to obtain this product. Invention containing -SO 3 Lithium-type cation exchange resin with Li active groups.

[0048] The above used contains -SO 3 -SO in lithium-type cation exchange r...

Embodiment 3

[0052] This example is used to illustrate the refining method of the lithium ion battery organic electrolyte provided by the present invention.

[0053] (1) Contains -SO 3 Preparation of Lithium-Type Cation Exchange Resin with Li Active Group

[0054] will contain -SO 3 The styrene-based cation exchange resin of the H active group (Jiangsu Linhai Chemical Factory Co., Ltd. 001×7 type) and the LiCl solution with a concentration of 10% by weight contacted at 55°C for 5 hours in a volume ratio of 1:4 and filtered, and then used Wash the obtained solid with 4% by weight of LiCl solution until the pH value in the washing liquid is neutral, then wash the obtained solid with water to remove the residual soluble lithium salt in the solid, and then dry it at 80° C. for 10 hours under an absolute pressure of 500 Pa That is, the lithium type cation exchange resin containing -SO3Li active group of the present invention is obtained.

[0055] By weighing 10 g containing -SO 3 The lithiu...

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Abstract

The invention provides a method for refining a lithium ion cell organic electrolytic solution. The method comprises a step of contacting a lithium ion exchange resin with an organic electrolytic solution, wherein the lithium ion exchange resin is the lithium ion exchange resin containing a -SO3Li active radical. Regarding the lithium cell organic electrolytic solution to be refined with the same lithium ion concentration of 1 mol / liter, the content of metal ion impurities in the organic electrolytic solution refined by the method of the invention and the prior method are reduced below 8ppm, but after the electrolytic solution is refined by the method of the invention, a lithium ion in the organic electrolytic solution is between 1.0 and 1.02 mol / liter, the lithium ion concentration is not greatly varied with variance ratio of between 0 and 2 percent; while after the electrolytic solution is refined by the prior method, the lithium ion in the organic electrolytic solution is 0.2 mol / liter, the lithium ion concentration is greatly reduced with reducing ratio as high as 80 percent. Therefore, the method of the invention is superior to the prior method.

Description

technical field [0001] The invention relates to a method for refining an organic electrolyte of a lithium ion battery. Background technique [0002] Organic electrolyte is an important part of lithium-ion batteries. It is responsible for the transmission of charge between the positive and negative electrodes in the battery, and has an important impact on the main performance of the battery, such as operating temperature, specific energy, cycle efficiency, and safety. [0003] The organic electrolyte is generally composed of electrolyte lithium salt and organic solvent. The organic solvent is generally a mixed solvent composed of two or more organic solvents. The electrolyte lithium salt used in commercial lithium-ion batteries is generally lithium hexafluorophosphate. The concentration of lithium ion is generally 0.5-2.0 mol / liter, preferably 0.7-1.6 mol / liter; Organic solvent mainly contains EC (ethylene carbonate), PC (propylene carbonate), DMC (dimethyl carbonate), DEC ( ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M6/16H01M10/0568
CPCY02E60/122Y02E60/10
Inventor 吕哲先雪峰刘会权
Owner BYD CO LTD
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