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Fluorine-containing carbonic ester solvent, its preparation method and electrolyte for lithium ion batteries

A lithium-ion battery and carbonate technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of low product yield and unfavorable industrial production, and achieve high yield, stable structure, and good flame retardancy Effect

Active Publication Date: 2012-04-18
湖南福邦新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fluorine-containing carbonate solvent reported in the prior art is a five-membered ring structure, and the structural stability needs to be further improved, and the synthesis of the fluorine-containing carbonate solvent uses LiBr as a catalyst, and the product yield is low, which is not conducive to industrial production

Method used

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  • Fluorine-containing carbonic ester solvent, its preparation method and electrolyte for lithium ion batteries
  • Fluorine-containing carbonic ester solvent, its preparation method and electrolyte for lithium ion batteries
  • Fluorine-containing carbonic ester solvent, its preparation method and electrolyte for lithium ion batteries

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preparation example Construction

[0039] The present invention also provides a preparation method of a compound of formula I structure, comprising the following steps:

[0040] Compound shown in formula III and CO 2 React under the effect of catalyst, obtain the compound shown in formula I,

[0041]

[0042] Formula III Formula I

[0043] Wherein, Rf is a fluorocarbon group. The reaction process is as follows:

[0044]

[0045] In addition, the present invention also provides a preparation method of a compound of formula II, comprising the following steps:

[0046] With the compound shown in formula IV and CO 2 React under the effect of catalyst, obtain the compound shown in formula II,

[0047]

[0048] Formula IV Formula II

[0049] Wherein, Rh is H or a hydrocarbon chain group, and Rf is a fluorocarbon group. The reaction process is as follows:

[0050]

[0051] The present invention has no other restrictions on the raw materials of formula III and formula IV, commercially available prod...

Embodiment 1

[0064] Synthesis of Compound of Formula VIII

[0065] Reference literature synthesis (Applied Surface Science 253(2006) 2304-2309)

[0066] 3-bromo-2,2-dibromomethylpropanol (32.5g, 100.0mmol), 10% NaOH aqueous solution (100.0g), phase transfer catalyst tetrabutylammonium bromide (TBAB, 0.79g, 2.46mmol ) and solvent CH 2 Cl 2 (150mL) was stirred at 30-35°C for 12 hours, the water phase was removed, the residual crude product was distilled under reduced pressure, and the fraction in the range of 92-95°C (4mmHg) was collected to obtain a colorless liquid, which was the target intermediate of formula VIIIa 17g, yield 70%.

[0067]

[0068] The above-mentioned reaction product (12.2g, 50mmol) is added in the 500ml three-necked bottle, then adds phase-transfer catalyst TABA solution (12%, 3g), KOH solution (45%, 6g) and tetrafluoropropanol (TFP) (14.5g , 110mmol), the mixture was stirred at 80-85°C for 24 hours, water (20mL) was added, the reaction system was cooled to room te...

Embodiment 2

[0076] The compound with the structure of formula IX was synthesized with reference to the literature (Applied Surface Science 253 (2006) 2304-2309).

[0077] 3-Bromo-2-bromomethylpropanol (23.2 g, 100.0 mmol), 10% aqueous NaOH (100.0 g), phase transfer catalyst tetrabutylammonium bromide (TBAB, 0.79 g, 2.46 mmol) and solvent CH 2 Cl 2 (150mL) was stirred at 30-35°C for 12 hours, the water phase was carefully removed, the residual crude product was distilled under reduced pressure, and the fractions in the range of 85-90°C (4mmHg) were collected to obtain a colorless liquid, which was the target intermediate of the formula IXa structure. Body 11.4g, yield 75%.

[0078]

[0079] Formula IXa

[0080] The above-mentioned reaction product (7.55g, 50mmol) was added in the 500ml three-necked bottle, then added phase transfer catalyst TABA solution (12%, 3g), KOH solution (45%, 6g) and tetrafluoropropanol (TFP) (7.3g , 55mmol), the mixture was stirred at 80-85°C for 24 hours, ...

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Abstract

The invention discloses a six-membered ring structured fluorine-containing carbonic ester solvent. The structure of six-membered ring structured fluorine-containing carbonic ester solvent is more stable. In addition, as two fluorocarbon groups can be introduced on the side chain, the fluorine content in the molecules is high, and better flame resistance and low-temperature performance can be obtained. The invention also provides a preparation method of the fluorine-containing carbonic ester solvent. According to the preparation method, a high-efficiency catalyst is used and the product yield is high. Furthermore, the invention provides an electrolyte for lithium ion batteries. The electrolyte contains the above fluorine-containing carbonic ester solvent and electrolyte salt, and also comprises a non-fluoride solvent and / or a fluorine-containing additive. The fluorine-containing carbonic ester solvent can be used to effectively improve homogeneity and flame resistance of the electrolyte and raise high-temperature stability of batteries. The solvent has lower low-temperature viscosity such that low-temperature performance of batteries is better. As the surface tension of the fluorine-containing carbonic ester solvent is low, wetability between the electrolyte and an electrode material can be improved, and furthermore, electrochemical performance of batteries can be optimized.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, more specifically, to a fluorine-containing carbonate solvent, a preparation method thereof, and an electrolyte for lithium-ion batteries. Background technique [0002] In recent years, with the increasing depletion of resources and the emergence of issues such as global warming, green and low-carbon lifestyles have been advocated. Among them, the development of electric vehicles and hybrid electric vehicles to partially replace internal combustion engine vehicles that consume fossil fuels is one of the main methods to solve the energy crisis and environmental degradation. Driving power is a key component that affects the popularization and use of electric vehicles. Today, widely used driving power includes lead-acid batteries, nickel metal hydride / nickel cadmium, and lithium secondary batteries. Among various driving power sources, lithium-ion batteries have been extensively studi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D319/06H01M10/0569
CPCY02E60/12Y02E60/10
Inventor 仲晓玲周济苍
Owner 湖南福邦新材料有限公司
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