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Non-aqueous electrolyte, preparation method thereof and battery adopting electrolyte

A non-aqueous electrolyte and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem that the electrolyte cannot obtain reversible overcharge protection and flame retardancy at the same time

Active Publication Date: 2014-04-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention solves the technical problem that the electrolyte cannot simultaneously obtain two performances of reversible overcharge protection and flame retardancy in the prior art

Method used

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  • Non-aqueous electrolyte, preparation method thereof and battery adopting electrolyte
  • Non-aqueous electrolyte, preparation method thereof and battery adopting electrolyte
  • Non-aqueous electrolyte, preparation method thereof and battery adopting electrolyte

Examples

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preparation example Construction

[0029] The present invention also provides a kind of preparation method of non-aqueous electrolytic solution, this method comprises:

[0030] 1) Put C 1 -C 4 Alcohol is mixed with phosphorus oxychloride to generate monochlorophosphate at 15°C;

[0031] 2) Mix the monochlorophosphate formed in step (1) with substituted phenothiazine and tetra-n-butylammonium hydrogen sulfate, and then stir and reflux at room temperature to obtain the additive with the following structure

[0032]

[0033] Wherein, R1, R2 are independently selected from alkene group, aromatic hydrocarbon group and C 1 -C 12 One of the alkyl groups, or containing F and / or N atom alkenyl group, aromatic hydrocarbon group and C 1 -C 12 One of the alkyl groups; R3 and R4 are independently selected from one of hydrogen atom, halogen atom, acetyl group, trifluoromethyl group, carboxylate group, cyano group and nitro group;

[0034] 3) Mix the lithium salt and the organic solvent, and then add the additive pre...

Embodiment 1

[0045] This example is used to illustrate the additives, electrolyte, positive and negative electrodes and their preparation methods provided by the present invention.

[0046] (1) Preparation of additives and electrolytes added with such additives:

[0047] Add 7.75g of phosphorus oxychloride to a 500ml two-necked flask, add 3.2g of anhydrous methanol at a rate of 0.5g / min, stir magnetically at 80r / min, and adjust the temperature to 15°C with ice-salt water. After the dropwise addition of anhydrous methanol is completed, keep warm for 1 h.

[0048] Pour the above reaction solution into a distillation bottle, carry out vacuum distillation (55°C), collect the fractions to obtain monochlorophosphate, and mix 8.375g of monochlorophosphate with 12.07g of 2-acetylphenothiazine, 0.169g Dissolve tetra-n-butylammonium hydrogen sulfate together in 100mL of methyl isopropyl ketone, add 50mL of 50% sodium hydroxide aqueous solution under stirring, stir at room temperature for 24h and th...

Embodiment 2

[0059] This example is used to illustrate the additives, electrolyte, positive and negative electrodes and their preparation methods provided by the present invention.

[0060] Add 7.75g of phosphorus oxychloride to a 500ml two-necked flask, add 4.6g of absolute ethanol at a rate of 0.5g / min, stir magnetically at 80r / min, and adjust the temperature to 15°C with ice-salt water. After the absolute ethanol was added dropwise, keep warm for 1 h.

[0061] Pour the above reaction solution into a distillation bottle, carry out vacuum distillation (55°C), collect the distillate to obtain monochlorophosphate, and mix 10.75g of monochlorophosphate with 11.22g of 2-methylcyanophenothiazine, 0.169 g of tetra-n-butylammonium hydrogen sulfate were dissolved in 100mL of methyl isopropyl ketone, and 50mL of 50% sodium hydroxide aqueous solution was added under stirring, stirred at room temperature for 24h and then refluxed for 24h.

[0062] Pour the reaction solution into a 1000mL separatory...

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Abstract

The invention provides non-aqueous electrolyte, a preparation method thereof and a battery adopting the non-aqueous electrolyte. The electrolyte contains a lithium salt, an organic solvent and an additive. The additive has a structural formula, wherein R1 and R2 are one of alkylene, an aromatic group and alkyl with 1 to 12 carbon atoms respectively, or are one of F and / or N atom-containing alkylene, the aromatic group and the alkyl with the 1 to 12 carbon atoms respectively; and R3 and R4 are one of a hydrogen atom, a halogen atom, acetyl, trifluoromethyl, a carboxylic acid ester group, cyan and nitryl respectively.

Description

technical field [0001] The invention relates to a nonaqueous electrolyte, a preparation method thereof and a battery using the electrolyte, in particular to a nonaqueous electrolyte for a lithium ion battery, a preparation method thereof and a lithium ion battery using the electrolyte. Background technique [0002] Lithium-ion secondary batteries are widely used, but they have always faced safety problems, and overcharging and the flammability of non-aqueous electrolytes are important factors that induce safety problems. Lithium-ion secondary battery electrolyte solvents are usually carbonates, such as EC (ethylene carbonate), PC (propylene carbonate), DMC (dimethyl carbonate), DEC (diethyl carbonate), EMC (methyl ethyl carbonate) esters), these solvent components are flammable. When a lithium-ion battery containing the above non-aqueous electrolyte is overcharged, the structure of the positive electrode active material is irreversibly changed due to excessive delithiation,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 余旭红冯彦军王圣
Owner BYD CO LTD
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