Propylene carbonate electrolyte as well as preparation method and application thereof

A technology of propylene carbonate and electrolyte, which is applied in the field of propylene carbonate electrolyte and its preparation, can solve problems such as poor cycle performance, damage to graphite electrode structure, and impact on battery performance, so as to improve performance, inhibit embedded graphite, and better interact The effect of action

Active Publication Date: 2021-03-30
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when graphite is used as the negative electrode, PC is easy to embed into the graphite layer together with lithium ions, causing damage to the graphite electrode structure, resulting in low reversible capacity of the battery, poor cycle performance, and seriously affecting battery performance.

Method used

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  • Propylene carbonate electrolyte as well as preparation method and application thereof
  • Propylene carbonate electrolyte as well as preparation method and application thereof
  • Propylene carbonate electrolyte as well as preparation method and application thereof

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preparation example Construction

[0060] The present invention also provides a kind of preparation method of the propylene carbonate electrolyte described in above-mentioned technical scheme, comprises the following steps:

[0061] In the glove box, mix propylene carbonate and chain carbonate evenly, then slowly add lithium salt, add the additive after the lithium salt is completely dissolved, and obtain propylene carbonate electrolyte after shaking well;

[0062] The additive is an isothiocyanate compound.

[0063] In the present invention, the glove box preferably adopts an argon atmosphere with a moisture content of less than 10 ppm.

[0064] In the present invention, the propylene carbonate, chain carbonate, lithium salt and additives are the same as those in the above technical solution, and will not be repeated here. In the present invention, the additive is an isothiocyanate compound.

[0065] In the present invention, the whole operation process ensures that the temperature of the mixed system does n...

Embodiment 1

[0075] In an argon atmosphere glove box with moisture less than 10ppm, mix 8.4g propylene carbonate (PC) and 3.2g dimethyl carbonate (DMC) evenly, then slowly add 1.5g lithium hexafluorophosphate (LiPF 6 ), the whole operation process ensures that the temperature of the mixing system does not exceed the decomposition temperature (30°C) of lithium hexafluorophosphate, and after the lithium salt is completely dissolved, add 0.655 g of ethyl isothiocyanate, and shake well to obtain a propylene carbonate electrolyte;

[0076] The mass ratio of each component in the propylene carbonate electrolyte is as follows: Lithium salt LiPF 6 is 11wt%, PC is 61wt%, DMC is 23wt%, and additive ethyl isothiocyanate is 5wt%.

Embodiment 2

[0078] Adopt the preparation method that embodiment 1 provides to obtain propylene carbonate electrolyte;

[0079] The mass ratio of each component in the propylene carbonate electrolyte is as follows: Lithium salt LiPF 6 is 11wt%, PC is 87wt%, and additive ethyl isothiocyanate is 2wt%.

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Abstract

The invention provides a propylene carbonate electrolyte as well as a preparation method and application thereof. The propylene carbonate electrolyte comprises the following components in percentage by weight of 8-20 percent of lithium salt; 20 wt%-91 wt% of propylene carbonate; 0 wt%-60 wt% of chain carbonate; 0.5 wt%-6wt% of an additive, wherein the additive is an isothiocyanate compound. Compared with the prior art, the propylene carbonate electrolyte provided by the invention takes the propylene carbonate as a main solvent and is matched with other components with specific contents, so that better overall interaction is realized, and the propylene carbonate can be inhibited from being embedded into the graphite, and accordingly the propylene carbonate can be used as a main cyclic carbonate solvent component or even a single solvent, and the important significance is realized on improving the performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, and more specifically, relates to a propylene carbonate electrolyte and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in daily life due to their high energy density and long cycle life. Among them, the electrolyte is an indispensable component of lithium-ion batteries, mainly composed of lithium salts, solvents and additives, and plays the role of conducting ions between the positive and negative electrodes in lithium-ion batteries. Currently the most widely used electrolyte is the lithium salt lithium hexafluorophosphate (LiPF 6 ) dissolved in two or three mixed solvents consisting of cyclic carbonates and chain carbonates; wherein, cyclic carbonates include ethylene carbonate (EC), propylene carbonate (PC), etc., and chain carbonates include Dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0569H01M10/0567H01M10/0568H01M10/0525
CPCH01M10/0566H01M10/0569H01M10/0567H01M10/0568H01M10/0525H01M2300/0028Y02E60/10
Inventor 彭章泉李小龙王佳伟马力坡
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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