A kind of propylene carbonate electrolyte and its preparation method and application

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 suppress embedded graphite, improve performance, and improve mutual The effect of action

Active Publication Date: 2022-07-12
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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  • A kind of propylene carbonate electrolyte and its preparation method and application
  • A kind of propylene carbonate electrolyte and its preparation method and application
  • A kind of propylene carbonate electrolyte and its preparation method and application

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preparation example Construction

[0060] The present invention also provides a method for preparing the propylene carbonate electrolyte described in the technical solution, comprising the following steps:

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

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

[0065] In the present invention, the entire operation process ensures that the temperature of the mixed system does not exceed th...

Embodiment 1

[0075] In an argon atmosphere glove box with moisture less than 10ppm, 8.4g propylene carbonate (PC) and 3.2g dimethyl carbonate (DMC) were mixed uniformly, and then 1.5g lithium hexafluorophosphate (LiPF) was slowly added 6 ), the entire operation process ensures that the temperature of the mixed system does not exceed the decomposition temperature of lithium hexafluorophosphate (30 ° C), and after the lithium salt is completely dissolved, 0.655g of ethyl isothiocyanate is added, and the propylene carbonate electrolyte is obtained after shaking up;

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

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 11 wt%, PC is 87 wt%, and the additive ethyl isothiocyanate is 2 wt%.

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Abstract

The invention provides a propylene carbonate electrolyte and a preparation method and application thereof; the propylene carbonate electrolyte comprises: lithium salt 8wt%-20wt%; propylene carbonate 20wt%-91wt%; chain carbonate 0wt% ~60wt%; the additive is 0.5wt%~6wt%; the additive is an isothiocyanate compound. Compared with the prior art, the propylene carbonate electrolyte provided by the present invention uses propylene carbonate as the main solvent, and cooperates with other specific content components to achieve overall better interaction, which can inhibit the embedding of propylene carbonate into graphite, thereby realizing As the main cyclic carbonate solvent component or even a single solvent, propylene carbonate is of great significance for improving the performance of lithium-ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and more particularly, 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 positive and negative electrodes in lithium-ion batteries. The most widely used electrolyte is the lithium salt lithium hexafluorophosphate (LiPF 6 ) in two or three mixed solvents consisting of cyclic carbonate and chain carbonate; wherein, the cyclic carbonate includes ethylene carbonate (EC), propylene carbonate (PC), etc., and the chain carbonate includes Dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC) and the like. Co...

Claims

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Application Information

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Patent Type & Authority Patents(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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