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A kind of power battery ionic liquid electrolyte

A technology of ionic liquids and power batteries, applied in the field of electrochemistry, can solve the problems of restricting the mass production of ionic liquid lithium batteries, high ionic liquids, and insufficient voltage supply of battery packs

Active Publication Date: 2021-12-10
福建东方醒狮新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current research on the application of ionic liquids to lithium battery electrolytes is still mostly in the laboratory stage, and the actual mature mass-produced ionic liquid lithium batteries still need to be tested. This is because the viscosity of ionic liquids is relatively traditional. The battery solvent is relatively high, and those skilled in the art are relatively conservative in the amount of it added to the electrolyte. On the other hand, when the ionic liquid is processed, it is easy to absorb moisture in the environment, resulting in more impurities in the ionic liquid. Therefore, in its production and processing, the environmental requirements of the production system are extremely high, especially for lithium batteries. Once the battery is unstable due to impurities, the battery pack voltage supply will be insufficient if it is small, and it will explode naturally if it is large. Greatly restricts the mass production of ionic liquid lithium batteries

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  • A kind of power battery ionic liquid electrolyte
  • A kind of power battery ionic liquid electrolyte
  • A kind of power battery ionic liquid electrolyte

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preparation example Construction

[0031] Based on the outline of the above scheme, the preparation method of the ionic liquid electrolyte of the power battery of the present invention specifically includes the following steps:

[0032] (1) Mix the imidazole-based ionic liquid and the piperidine-based ionic liquid under a temperature environment of 55-75° C. and an inert gas atmosphere and stir for 24-36 hours to prepare a mixture A;

[0033] (2) Maintaining a temperature environment of 55-75° C. and an inert gas atmosphere, adding the quaternary ammonium ionic liquid to the mixture A and continuing to stir for 24-36 hours to prepare the mixture B;

[0034] (3) In the case of maintaining stirring and an inert atmosphere, after naturally cooling the mixture B to room temperature, add an organic solvent and a lithium salt to the mixture B in sequence, and transfer the mixed system to a vacuum mixer, at 0.05 ~ 0.07Mpa Under a certain vacuum environment, stir at a stirring speed of 100-200r / min for 4-6h, then take ...

Embodiment 1

[0047] The preparation method of the power battery ionic liquid electrolyte specifically comprises the following steps:

[0048] (1) With imidazole ionic liquid 1-ethyl-3-methylimidazole bis-trifluoromethanesulfonimide salt, piperidine ionic liquid 1-butyl-1-methylpiperidine bis(trifluoromethanesulfonate) Acyl)imide salt and quaternary ammonium ionic liquid tributylmethylammonium bis(trifluoromethanesulfonyl)imide salt are used as raw materials, which are respectively placed in a container with an open upper end for vacuum drying, and carried out every 30min. Weighing the mass until the mass loss of two adjacent weighings is less than 2%, sealing the upper end of the container and cooling the imidazole ionic liquid, piperidine ionic liquid or quaternary ammonium ionic liquid naturally for later use;

[0049] (2) Mix the imidazole-based ionic liquid and the piperidine-based ionic liquid under argon gas atmosphere at a temperature of 65° C. and stir for 30 hours to prepare a mix...

Embodiment 2

[0054] The preparation method of the power battery ionic liquid electrolyte specifically comprises the following steps:

[0055] (1) Using imidazole ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate and piperidine ionic liquid 1-butyl-1-methylpiperidine bis(trifluoromethanesulfonyl)imide Salt and quaternary ammonium ionic liquid tributylmethylammonium bis(trifluoromethanesulfonyl)imide salt are used as raw materials, which are respectively placed in a container with an open upper end for vacuum drying, and its mass is weighed every 30 minutes until the mass loss of two adjacent weighings is less than 2%, the upper end of the container is closed and the imidazole ionic liquid, piperidine ionic liquid or quaternary ammonium ionic liquid is cooled naturally for later use;

[0056] (2) Mix the imidazole-based ionic liquid and the piperidine-based ionic liquid under argon gas atmosphere at a temperature of 60° C. and stir for 36 hours to prepare a mixture A;

[0057] (3) ...

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Abstract

The invention discloses an ionic liquid electrolyte for a power battery, which comprises an imidazole ionic liquid, a piperidine ionic liquid and a quaternary ammonium ionic liquid, which are sequentially stirred and mixed under a temperature environment of 55-75°C and an inert gas atmosphere After treatment, under the condition of maintaining stirring and inert atmosphere, cool naturally to normal temperature, then add organic solvent and lithium salt to the mixed system in sequence, and place in a vacuum environment to carry out stirring treatment and drying treatment in sequence. The scheme cleverly uses the mixture of imidazole ionic liquid, piperidine ionic liquid and quaternary ammonium ionic liquid as the main solvent, supplemented by non-ionic liquid organic solvent as auxiliary solvent to mix with lithium salt to construct high-voltage The electrolyte system with chemical stability and wide electrochemical window not only has a long service life, but also has excellent electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to an ionic liquid electrolyte for a power battery. Background technique [0002] As the types of electronic devices and self-contained power devices become more and more extensive, the performance of the integrated processor or power system is getting stronger and stronger, and the current battery (carbon battery, lead battery, nickel-metal hydride battery) , alkaline batteries, lithium-iron batteries, etc.), its performance shortcomings are becoming more and more obvious, for example: battery capacity, voltage stability, thermal stability and cycle life are all technical problems to be overcome in the field of battery technology , In addition, as a new energy electric vehicle with high popularity at present, the requirements for the battery supplying power energy are getting higher and higher, not only requiring miniaturization, light weight, and thinning, but also requir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0566H01M10/0567H01M10/0568H01M10/0569H01M10/052
CPCH01M10/0566H01M10/0567H01M10/0568H01M10/0569H01M10/052H01M2300/0025Y02E60/10
Inventor 钟旭航张旻澍李晓丹
Owner 福建东方醒狮新能源有限公司