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Electrolytic solution, preparation method thereof, secondary battery comprising electrolyte, and electric device

A secondary battery and electrolyte technology, applied in the field of batteries, can solve problems such as difficult to meet stable charge and discharge, limited electrochemical window, difficult to form, etc., to achieve the effects of suppressing side reactions, improving solubility, and reducing dissociation energy

Inactive Publication Date: 2019-03-26
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

New solvents include polar solvents such as acetonitrile, dimethyl sulfoxide, and water. However, these solvents have limited electrochemical windows, and it is difficult to form an effective solid-electrolyte interface (SEI) film, and it is difficult to meet the requirements of stable charging under high pressure. purpose of discharge
In addition, new electrolytes, especially electrolytes containing organic anions, including bistrifluoromethanesulfonimide salt (LiTFSI), bisfluorosulfonimide salt (LiFSI), bispentafluoroethanesulfonimide (LiBTFSI ), etc., can obtain high-concentration electrolyte, however, such electrolytes containing organic anions are difficult to effectively passivate the positive electrode current collector aluminum foil, and the cost is often high

Method used

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  • Electrolytic solution, preparation method thereof, secondary battery comprising electrolyte, and electric device
  • Electrolytic solution, preparation method thereof, secondary battery comprising electrolyte, and electric device
  • Electrolytic solution, preparation method thereof, secondary battery comprising electrolyte, and electric device

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preparation example Construction

[0057] In a second aspect, the present invention provides a method for preparing an electrolyte, comprising the following steps:

[0058] The electrolyte, the additive and the ion acceptor compound are dissolved in the solvent to obtain the electrolytic solution.

[0059] The electrolytic solution obtained by using the preparation method has all the advantages of the above-mentioned electrolytic solution, which will not be repeated here.

[0060] In some embodiments of the present invention, the preparation method includes the following steps:

[0061] S1) dissolving the additive and a part of the electrolyte in a solvent to configure a saturated solution of the electrolyte;

[0062] S2) After adding the ion acceptor compound to the saturated solution obtained in step S1), an unsaturated intermediate liquid of the electrolyte is formed;

[0063] S3) Continue adding another part of electrolyte to the unsaturated intermediate solution obtained in step S2) to a saturated state ...

Embodiment 1

[0080] This embodiment is a kind of electrolytic solution, and its preparation process is as follows:

[0081] S1) 0.608g LiPF 6 Add it to 1ml propylene carbonate (PC) solution, and add vinylene carbonate (VC) to the PC solution at the same time to configure LiPF 6 For a saturated solution with a concentration of 4.5M, the amount of VC added is 2wt% of the saturated solution;

[0082] S2) Add tris(pentafluorophenyl)borane (TPFPB) to the prepared saturated solution to form an unsaturated intermediate solution of the electrolyte, wherein the concentration of TPFPB in the unsaturated intermediate solution is 0.2M;

[0083] S3) Add excess LiPF to the unsaturated intermediate liquid 6 Configured as a saturated solution to obtain LiPF 6 of electrolyte.

Embodiment 2～8

[0085] Examples 2-8 are respectively a kind of electrolyte, which are prepared by the same preparation method as that of Example 1. Compared with Example 1, the difference is that the concentration of tris(pentafluorophenyl)borane added is different, and the others are the same as Example 1.

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Abstract

The invention provides an electrolytic solution, a preparation method thereof, a secondary battery comprising the electrolytic solution, and an electric device, and relates to the field of batteries.The electrolytic solution is prepared from a solvent, an electrolyte, an additive and an ion receptor compound; the ion receptor compound comprises an anion receptor compound for binding to an anion in the electrolyte, and / or a cation receptor compound for binding to a cation in the electrolyte. With the electrolytic solution, the technical problem of requiring a specific solvent in the preparation of a high-concentration electrolytic solution in the prior art can be alleviated, and the purpose of increasing the concentration of the electrolytic solution without changing the solvent composition of the electrolytic solution can be achieved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to an electrolyte, a preparation method thereof, a secondary battery and electrical equipment containing the same. Background technique [0002] Secondary batteries such as lithium-ion batteries, as green energy storage devices, have been widely used in various fields. As an important part of the secondary battery, the electrolyte has a decisive influence on the properties of the battery. [0003] Recent studies have shown that high-concentration electrolytes exhibit many unique properties compared to low-concentration electrolytes. For example, a high-concentration electrolyte can suppress the phenomenon of propylene carbonate (PC) intercalating graphite with lithium ions, thereby avoiding the use of traditional EC solvents and expanding the selection range of electrolyte solvents. At the same time, the high-concentration electrolyte can enhance the redox stability of the electrolyte, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 唐永炳欧学武
Owner SHENZHEN INST OF ADVANCED TECH
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