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Electrolysing solution acid stripping method and apparatus

A deacidification method and electrolyte technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of low deacidification efficiency and resin deacidification efficiency, and achieve the effect of reducing maintenance costs and inhibiting corrosion.

Inactive Publication Date: 2007-12-05
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for deacidifying electrolyte with high actual deacidification efficiency in order to overcome the disadvantage of low actual deacidification efficiency of the existing electrolyte deacidification method
[0007] The existing electrolyte deacidification method only uses weakly basic anion exchange resin to deacidify the electrolyte, which has the disadvantage of low deacidification efficiency of the resin as mentioned above.

Method used

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  • Electrolysing solution acid stripping method and apparatus

Examples

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Effect test

Embodiment 1

[0042] LiPF 6 Formulated with ethylene carbonate, diethyl carbonate and dimethyl carbonate to make LiPF 6 The electrolyte is 1 mol / liter (the volume ratio of ethylene carbonate, diethyl carbonate and dimethyl carbonate is 1:1:1, and hydrofluoric acid is 120 ppm). The electrolyte passes through the deacidification device shown in Figure 1 at a flow rate of 3 ml / min. In this deacidification device, a weakly basic anion exchange resin container with a diameter of 3 cm is filled with 75 ml of weakly basic anion exchange. Resin (AmberliteIRA-68 with a theoretical adsorption capacity of 1.25 equivalents / liter), a strong alkaline anion exchange resin container with a diameter of 3 cm is filled with 25 ml of strong alkaline anion exchange resin (theoretical adsorption capacity is 1.25 equivalents / liter Amberlite IRA-400), for the adsorption of hydrofluoric acid. After 40 minutes, a sample of the treated electrolyte was taken at the sampling point, and the content of hydrofluoric acid was ...

Embodiment 2

[0044] LiPF 6 Formulated with ethylene carbonate, diethyl carbonate and dimethyl carbonate to make LiPF 6 The electrolyte is 1 mol / L (the volume ratio of ethylene carbonate, diethyl carbonate and dimethyl carbonate is 1:1:1, and hydrofluoric acid is 50 ppm). The electrolyte passes through the deacidification device shown in Figure 1 at a flow rate of 10 ml / min. In this deacidification device, a 3 cm diameter weakly basic anion exchange resin container is filled with 65 ml of weakly basic anion exchange. Resin (Duolite A-30B with a theoretical adsorption capacity of 1.25 equivalents / liter), a strong alkaline anion exchange resin container with a diameter of 3 cm is filled with 35 ml of strong alkaline anion exchange resin (theoretical adsorption capacity is 1.25 equivalents / liter Duolite A162), to carry out the adsorption of hydrofluoric acid. After 40 minutes, a sample of the treated electrolyte was taken at the sampling point, and the content of hydrofluoric acid was analyzed to ...

Embodiment 3

[0046] LiPF 6 Formulated with ethylene carbonate, diethyl carbonate and dimethyl carbonate to make LiPF 6 The electrolyte is 1 mol / L (the volume ratio of ethylene carbonate, diethyl carbonate and dimethyl carbonate is 1:1:1, and hydrofluoric acid is 25 ppm). The electrolyte passes through the deacidification device shown in Figure 1 at a flow rate of 2 ml / min. In this deacidification device, a 3 cm diameter weakly basic anion exchange resin container is filled with 85 ml of weakly basic anion exchange. Resin (DowexMWA1 with a theoretical adsorption capacity of 1.25 equivalents / liter), a strong alkaline anion exchange resin container with a diameter of 3 cm is filled with 15 ml strong alkaline anion exchange resin (theoretical adsorption capacity of Diaion PA412 with a theoretical adsorption capacity of 1.25 equivalents / liter) , Adsorption of hydrofluoric acid. After 40 minutes, a sample of the treated electrolyte was taken at the sampling point, and the content of hydrofluoric aci...

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Abstract

The invention provides an electrolyte disacidifying method, comprising: contacting electrolyte with anion exchange resin, where the anion exchange resin comprises at least a segment of weakly alkali anion exchange resin and at least a segment of strongly alkali anion exchange resin. And the invention provides an electrolyte disacidifying device. And the invention disacidifies the electrolyte by combining at least a segment of weakly alkali anion exchange resin and at least a segment of strongly alkali anion exchange resin. As compared with singly using weakly alkali anion exchange resin, the invention largely raises the disacidifying efficiency.

Description

Technical field [0001] The present invention relates to an electrolyte deacidification method and device, and more specifically, to a deacidification method and device of an electrolyte for lithium ion batteries. Background technique [0002] The electrolyte for a lithium ion battery contains an electrolyte lithium salt and an organic solvent. Electrolyte is an important part of lithium-ion batteries. Its composition and the control of various impurity contents have an important influence on the main performance of the battery, such as operating temperature, specific energy, cycle efficiency, and safety. Among them, hydrofluoric acid is one of the important factors that affect the performance of lithium-ion battery electrolyte. Excessive hydrofluoric acid content in the electrolyte will increase the internal resistance of the battery, reduce the specific capacity and cycle efficiency, and cause internal corrosion of the battery. . Therefore, the content of hydrofluoric acid in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M10/056
CPCY02E60/122Y02E60/10
Inventor 吕哲
Owner BYD CO LTD
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