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Additive for non-aqueous electrolyte of lithium ion battery and preparation method and application thereof

A non-aqueous electrolyte, lithium-ion battery technology, applied in non-aqueous electrolyte storage batteries, electrolyte storage battery manufacturing, secondary batteries, etc. Number of cycles, reduction of increase in membrane impedance, effect of mild reaction conditions

Inactive Publication Date: 2018-09-18
VALIANT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many electrolyte improvement formulas often start with the basic components of the electrolyte, which improves the high-temperature performance, but still cannot meet the needs of battery use.

Method used

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  • Additive for non-aqueous electrolyte of lithium ion battery and preparation method and application thereof
  • Additive for non-aqueous electrolyte of lithium ion battery and preparation method and application thereof
  • Additive for non-aqueous electrolyte of lithium ion battery and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: the synthesis of compound LT01:

[0036] Weigh 76.0 g (0.5 mol) of 2,3-dihydroxysulfolane and 250 mL of dichloroethane into a 1 L three-necked flask. Under nitrogen protection, 71.5 g (0.6 mol) of thionyl chloride was slowly added dropwise to the reaction system at 20-25° C., and the drop was completed in about 1.0 hr. Keep warm at 25-30°C for 2.5hrs.

[0037] Under the condition of 25-30° C., the above reaction solution was dropped into a mixed solution containing 0.1035 g (0.0005 mol) of ruthenium trichloride trihydrate and 150 g of 8% sodium bicarbonate (0.12 mol) aqueous solution. 323.3 g of sodium hypochlorite (0.50 mol) aqueous solution was added dropwise at 0-5°C. After about 3.0hrs of dripping, keep warm at 0~5℃ for 1.0hr.

[0038] Add saturated sodium bisulfite aqueous solution dropwise to the reaction system to quench the reaction. The layers were separated, and the organic phase was dried over anhydrous sodium sulfate. Pass through the colu...

Embodiment 2

[0039] Embodiment 2: the synthesis of compound LT02

[0040] Weigh 76.0 g (0.5 mol) of 3,4-dihydroxysulfolane and 250 mL of dichloromethane into a 1 L three-necked flask. Under nitrogen protection, 64.5 g (0.525 mol) of thionyl chloride was slowly added dropwise to the reaction system at 15-20° C., and the drop was completed in about 1.0 hr. Keep warm at 20-25°C for 2.0hrs.

[0041] Under the condition of 25-30° C., the above reaction solution was dropped into a mixed solution containing 0.1035 g (0.0005 mol) ruthenium trichloride trihydrate and 150 g potassium carbonate (0.10 mol) aqueous solution with a mass fraction of 9.3%. 388g of sodium hypochlorite (0.6mol) aqueous solution was added dropwise at 0-5°C. After about 3.0hrs of dripping, keep warm at 0~5℃ for 0.5hr.

[0042] Add saturated sodium bisulfite aqueous solution dropwise to the reaction system to quench the reaction. The layers were separated, and the organic phase was dried over anhydrous sodium sulfate. Pas...

Embodiment 3

[0043] Embodiment 3: the synthesis of compound LT03

[0044]Weigh 119.0 g (0.5 mol) of 3-F-4,5-dihydroxy-2-trifluoromethyl sulfolane and 250 mL of dichloromethane into a 1 L three-neck flask. Under nitrogen protection, 64.5 g (0.525 mol) of thionyl chloride was slowly added dropwise to the reaction system at 15-20° C., and the drop was completed in about 1.0 hr. Keep warm at 20-25°C for 2.0hrs.

[0045] Under the condition of 25-30 DEG C, the above reaction solution was dropped into a mixed solution containing 0.029g (0.00006mol) manganese acetate tetrahydrate and 150g aqueous solution of sodium carbonate (0.21mol) with a mass fraction of 15.0%. 200g of hydrogen peroxide (0.6mol) aqueous solution was added dropwise at 0-5°C. After about 3.0hrs of dripping, keep warm at 0~10℃ for 4.0hr.

[0046] Add saturated sodium bisulfite aqueous solution dropwise to the reaction system to quench the reaction. The layers were separated, and the organic phase was dried over anhydrous sod...

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Abstract

The invention proposes an additive for a non-aqueous electrolyte of a lithium ion battery and preparation method and application thereof. The additive has the following molecular structure shown in aformula (1), wherein R1 and R2 respectively express fluoro group or trifluoromethyl, n and m are respectively 0, 1 or 2, A is selected from one of the following structures shown in the specification,and * expresses connection sites. After the additive is applied into the electrolyte of the lithium ion battery, the reduction of the initial capacity of the battery can be prevented, the initial discharging capacity is improved, the battery expansion after high-temperature placing is reduced, the charge-discharge performance of the battery is improved, and the cycle frequency is increased.

Description

technical field [0001] The invention relates to an additive for a lithium-ion non-aqueous electrolyte, a preparation method and application thereof, in particular to an additive for a non-aqueous electrolyte for improving the charge-discharge performance and cycle number performance of a lithium-ion battery at high temperature. Background technique [0002] Lithium-ion batteries are widely used in consumer electronics products, energy storage and power batteries due to their advantages such as high specific energy, long cycle life, and small self-discharge. With the wide application of lithium-ion batteries, its cycle life has become an important indicator of lithium-ion batteries. In addition, because lithium-ion batteries show instability after cycling, for example, lithium-ion The thermal stability of the battery will deteriorate. In order to ensure the safety of use, while improving the cycle performance of the lithium-ion battery, it is also necessary to improve the the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/0568H01M10/0569
CPCH01M10/0567H01M10/0568H01M10/0569H01M10/058Y02E60/10Y02P70/50
Inventor 许彬林存生邢宗仁石宇周银波胡葆华
Owner VALIANT CO LTD
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