Method for treating solvent in lithium hexafluorophosphate electrolyte

A technology of lithium hexafluorophosphate and processing method, which is applied to circuits, electrical components, secondary batteries, etc., can solve the problems of difficult production dehydration and high viscosity, achieve good operability and practicability, quality control and cost reduction, and speed up production progress Effect

Inactive Publication Date: 2018-03-09
邱先虎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, its viscosity is relatively high, and it is difficult to dehydrate in ordinary production. It takes more than 5 hours, and the moisture is barely suitable for use.

Method used

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  • Method for treating solvent in lithium hexafluorophosphate electrolyte

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Comparison scheme
Effect test

Embodiment 1

[0025] The solvent of the lithium ion electrolyte is a mixed solvent, which includes ethylene carbonate solvent and other carbonate organic solvents, and the weight percentage of ethylene carbonate solvent in the mixed solvent is: 10% to 50%; The weight percent of the ester organic solvent is: 50% to 90%;

[0026] The processing method includes the following steps:

[0027] 1) Liquefaction treatment:

[0028] After sealing the ethylene carbonate solvent, place it in an oven, adjust the temperature of the oven to 70-90°C, and place it for 10-14 hours, so that the ethylene carbonate solvent is evenly heated and liquefied;

[0029] 2) Dehydration treatment:

[0030] Sampling and analyzing the water content of the liquefied ethylene carbonate solvent and other carbonate solvents, then inject other carbonate solvents into the dehydration treatment equipment first, and then inject the ethylene carbonate solvent into the dehydration equipment for dehydration treatment , until the ...

Embodiment 2

[0033] The difference between this embodiment 2 and the above-mentioned embodiment 1 is that: in the ethylene carbonate production system with heat preservation at 30 degrees and no heat tracing, 400 kilograms of diethyl carbonate raw materials are injected first, and then 400 kilograms of liquefied ethylene carbonate are injected . Then turn on the circulating pump for 15 minutes, take a sample and analyze the moisture before dehydration. Then open the relevant valves of the production system to start dehydration. Samples were then taken every hour for moisture analysis. Labeled as sample DEC+A.

Embodiment 3

[0035] The difference between this embodiment 2 and the above-mentioned embodiment 1 is that: in the ethylene carbonate production system with heat preservation at 20 degrees and no heat tracing, 800 kilograms of diethyl carbonate raw materials are injected first, and then 400 kilograms of liquefied ethylene carbonate are injected . Then turn on the circulating pump for 15 minutes, take a sample and analyze the moisture before dehydration. Then open the relevant valves of the production system to start dehydration. Samples were then taken every hour for moisture analysis. Labeled as sample DEC+A1.

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Abstract

The invention discloses a method for treating a solvent in lithium hexafluorophosphate electrolyte. The solvent is a mixed solvent which comprises an ethylene carbonate solvent and other carbonic ester organic solvents. The method comprises the following steps: (1) carrying out liquefaction treatment: sealing the ethylene carbonate solvent and then putting into a drying oven, adjusting the temperature of the drying oven to 70-90 DEG C, placing for 10-14h, enabling the ethylene carbonate solvent to be evenly heated, and then carrying out liquidation; (2) carrying out dehydration treatment: sampling the liquified ethylene carbonate solvent and the other carbonic ester organic solvents and carrying out moisture analysis; after that, injecting the other carbonic ester organic solvents into a dehydration device, then injecting the ethylene carbonate solvent into the dehydration device, and carrying out dehydration treatment until the water content of the mixed solvent is less than or equalto 10ppm. According to the method provided by the invention, the solvent in the electrolyte is subjected to special mixed dehydration treatment, so that the dehydration is accelerated, the productionefficiency is increased, and the production cost is effectively lowered.

Description

technical field [0001] The invention relates to the technical field of production and treatment of lithium battery electrolytes, in particular to a method for treating solvents in lithium hexafluorophosphate electrolytes. Background technique [0002] Due to its own advantages, lithium-ion batteries have been widely used in electronic digital products, and are also the first choice for new energy electric vehicles in recent years. For lithium-ion batteries, it has the following characteristics: [0003] First, the lithium-ion battery electrolyte is composed of an organic solvent and an electrolyte (lithium salt). The commonly used electrolyte is lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), etc., wherein lithium hexafluorophosphate has good conductivity and electrochemical stability, thus, lithium hexafluorophosphate electrolyte is currently the mainstream lithium battery electrolyte; [0004] Second, it is sensitive to moisture and hydroflu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/02H01M10/0569H01M10/0525
CPCB01D17/02H01M10/0525H01M10/0569Y02E60/10
Inventor 邱先虎
Owner 邱先虎
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