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
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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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