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Lithium ion battery redox couple additive and lithium ion battery electrolyte

A technology of lithium-ion batteries and additives, applied in the direction of secondary batteries, electrochemical generators, secondary battery repair/maintenance, etc., can solve the problem that the overcharge protection ability cannot meet the actual use requirements, and the additives can meet the actual application requirements , No overcharge protection time and other issues are provided to avoid thermal instability or even burning, avoid early scrapping, and improve overcharge safety performance

Inactive Publication Date: 2014-05-28
张智斌 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these published patents do not provide information about the overcharge protection time, charging rate impact, battery heat protection index, etc. for the anti-overcharge protection of lithium-ion batteries, and their overcharge protection capabilities cannot be used in practice. Require
[0010] In summary, currently available redox pair additives rarely meet the requirements for practical applications.
At the same time, its electrochemical stability, electrochemical potential and compatibility with the battery system have become obstacles restricting its practical application. Therefore, the development of new redox couple additives to overcome the above shortcomings has become an urgent problem to be solved.

Method used

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  • Lithium ion battery redox couple additive and lithium ion battery electrolyte
  • Lithium ion battery redox couple additive and lithium ion battery electrolyte
  • Lithium ion battery redox couple additive and lithium ion battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The structural formula of the lithium-ion battery redox pair additive is as follows:

[0042]

[0043] Its preparation method is: under the protection of nitrogen, add 2,3,5,6-tetramethylhydroquinone (0.2 mmol) in tetrahydrofuran (20 mL) to sodium hydride (0.6 mmol) in tetrahydrofuran (20 mL) In suspension, the resulting mixture was stirred at room temperature for 20 minutes. 2-Methoxyethoxychloromethane (0.4 mmol) was slowly added to the above mixture, and the resulting solution was stirred overnight (12 h) at room temperature. The mixture was cooled to 0°C in an ice bath, slowly added saturated ammonium chloride aqueous solution (50 mL) under stirring, transferred to a separatory funnel, oscillated, allowed to stand still, separated into layers, and the organic phase was collected. The aqueous phase was extracted with dichloromethane (50 mL x 3). The organic phases were combined and dried over anhydrous sodium sulfate. The solvent was removed by rotary evaporati...

Embodiment 2

[0045] The structural formula of the lithium-ion battery redox pair additive is as follows:

[0046]

[0047] Its preparation method is: under the protection of nitrogen, add 2-ethyl-3,5-dimethylhydroquinone (0.2 mmol) in tetrahydrofuran (20 mL) to sodium hydride (0.6 mmol) in tetrahydrofuran (20 mL ) suspension, and the resulting mixture was stirred at room temperature for 20 minutes. 2-Methoxyethoxychloromethane (0.4 mmol) was slowly added to the above mixture, and the resulting solution was stirred overnight (12 h) at room temperature. The mixture was cooled to 0°C in an ice bath, slowly added saturated ammonium chloride aqueous solution (50 mL) under stirring, transferred to a separatory funnel, oscillated, allowed to stand still, separated into layers, and the organic phase was collected. The aqueous phase was extracted with dichloromethane (50 mL x 3). The organic phases were combined and dried over anhydrous sodium sulfate. The solvent was removed by rotary evapor...

Embodiment 3

[0049] The structural formula of the lithium-ion battery redox pair additive is as follows:

[0050]

[0051] Its preparation method is: under the protection of nitrogen, add 2,3,5,6-tetramethylhydroquinone (0.2 mmol) in tetrahydrofuran (20 mL) to sodium hydride (0.6 mmol) in tetrahydrofuran (20 mL) In suspension, the resulting mixture was stirred at room temperature for 20 minutes. 2-Methoxychloroethane (0.4 mmol) was slowly added to the above mixture, and the resulting solution was stirred overnight (12 h) at room temperature. The mixture was cooled to 0°C in an ice bath, slowly added saturated ammonium chloride aqueous solution (50 mL) under stirring, transferred to a separatory funnel, oscillated, allowed to stand still, separated into layers, and the organic phase was collected. The aqueous phase was extracted with dichloromethane (50 mL x 3). The organic phases were combined and dried over anhydrous sodium sulfate. The solvent was removed by rotary evaporation, and...

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Abstract

The invention relates to a lithium ion battery redox couple additive and a lithium ion battery electrolyte, which belong to secondary lithium ion battery electrolytes, in particular to a functional electrolyte used when a lithium ion battery is overcharged or misused. The lithium ion battery overcharge safeguard functional electrolyte comprises an overcharge additive, actually a redox couple additive. Through combination of different additives, not only can the problem of poor safety caused under the overcharge condition of the lithium ion battery be solved, but also the capacity in a battery pack can be balanced, and the service efficiency of the batteries is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery redox pair additive and a lithium ion battery electrolyte. Background technique [0002] As a new type of energy storage technology, lithium-ion batteries have been widely used in the power supply of electronic products, such as mobile phones, notebook computers, mp3 players and so on. Compared with other energy storage technologies, lithium-ion batteries have the advantages of high energy density, long service life, and no memory effect. Therefore, their application prospects are very broad. Research has been effectively carried out, and trial products have been released to the market. However, the safety performance of lithium-ion battery technology is an important issue hindering its further application, and the electrolyte, an indispensable component of the battery, not only plays an important role in determining the performanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0568H01M10/42
CPCY02E60/12Y02E60/10
Inventor 张智斌张扬董聚香
Owner 张智斌
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