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Electrolyte additive and high-voltage electrolyte containing same

An electrolyte additive and electrolyte technology, applied in the field of electrolyte additives and high-voltage electrolytes, can solve the problems of poor cycle performance, restricting the development of lithium-ion batteries, and reducing the efficiency of charging and discharging of lithium-ion batteries, so as to improve energy density. Effect

Active Publication Date: 2016-05-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carbonate-based electrolyte of conventional lithium-ion batteries is easy to decompose under high voltage, resulting in reduced charge and discharge efficiency of lithium-ion batteries and poor cycle performance, which restricts the further development of high-voltage lithium-ion batteries.
[0003] In the prior art, there is no report on the related technology that acrylic acid sulfate anhydride derivatives can improve the electrochemical performance of lithium-ion batteries under high voltage through the synergistic effect of various electron-withdrawing groups.

Method used

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  • Electrolyte additive and high-voltage electrolyte containing same
  • Electrolyte additive and high-voltage electrolyte containing same
  • Electrolyte additive and high-voltage electrolyte containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation method of the high-voltage electrolyte additive used is:

[0044] (1) Take a certain amount of acrylic acid and propylene sulfuric anhydride (molar ratio 1:1) and mix them evenly, and reflux at 80°C for 6 hours, and the obtained mixed liquid is purified by rotary steaming at 60°C to obtain a one-step reaction product;

[0045] (2) Add trimethoxysilane (molar ratio 1:1) to the product obtained in (1), add solvent toluene at a volume ratio of 1:10, add 5 mg of platinum as a hydrosilylation reaction catalyst, and reflux at 60°C 6h, the obtained liquid was removed by rotary evaporation at 80°C to obtain R 1 , R 2 , R 3 Both are methyl structures;

[0046] (3) mix (2) obtained substance with NC-OH, F 3 C-CH 2 CH 2 -OH, CH 3 COOCH 2 -OH is mixed evenly (molar ratio 1:1:1:1), solvent toluene is added at a volume ratio of 1:10, refluxed at 80°C for 2-4h to remove methanol, and the resulting mixture is purified by rotary evaporation at 60°C to obtain the ...

Embodiment 2

[0051] The preparation method of the high-voltage electrolyte additive used is:

[0052] (1) Take a certain amount of acrylic acid and propylene sulfuric anhydride (molar ratio 1:1), mix and stir evenly, reflux at 90°C for 7 hours, and the obtained mixed liquid is purified by rotary steaming at 60°C to obtain a one-step reaction product;

[0053] (2) Add trimethoxysilane (molar ratio 1:1) to the product obtained in (1), add solvent toluene at a volume ratio of 1:10, add 5 mg of platinum as a hydrosilylation reaction catalyst, and reflux at 40°C 6h, the obtained liquid was removed by rotary evaporation at 80°C to obtain R 1 , R 2 , R 3 Both are methyl structures;

[0054] (3) Mix the substance obtained in (2) with NC-OH (molar ratio 1:3), add the solvent toluene at a volume ratio of 1:10, reflux at 80°C for 2h to remove methanol, and rotate the obtained mixture at 60°C Purification, the desired additives can be obtained.

[0055] Add 0.5% of the total weight of the electro...

Embodiment 3

[0059] The preparation method of the high-voltage electrolyte additive used is:

[0060] (1) Take a certain amount of acrylic acid and propylene sulfuric anhydride (molar ratio 1:1) and mix them evenly, and reflux at 80°C for 8 hours, and the obtained mixed liquid is purified by rotary steaming at 60°C to obtain a one-step reaction product;

[0061] (2) Add trimethoxysilane (molar ratio 1:1) to the product obtained in (1), add solvent toluene at a volume ratio of 1:10, add 5 mg of platinum as a hydrosilylation reaction catalyst, and reflux at 80°C 6h, the obtained liquid was removed by rotary evaporation at 80°C to obtain R 1 , R 2 , R 3 Both are methyl structures;

[0062] (3) Combine the substance obtained in (2) with CH 3 COOCH 2 -OH mixed evenly (molar ratio 1:3), adding solvent toluene at a volume ratio of 1:10, refluxed at 100°C for 3h for dehydration, and rotary steamed and purified the obtained mixture at 80°C to obtain the desired additive.

[0063] Add 0.05% of...

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Abstract

The invention relates to an electrolyte additive and a high-voltage electrolyte containing the same, and belongs to the technical field of lithium-ion batteries. The electrolyte additive is an acrylic sulfuric anhydride derivative. 0.1%-10% of additive is added to a conventional electrolyte to prepare the high-voltage electrolyte; and the electrolyte has a high oxidation potential (over 4.5V), so that a high-voltage cathode material can be matched. Necessary conditions are provided for obtaining of the high-energy density lithium-ion battery; and addition of the additive is conducive to forming of a stable SEI film, so that the cycle performance of the battery can be prolonged. The electrolyte additive provided by the invention is reasonable in structure design and simple in preparation method; the obtained product is excellent in performance; and large-scale industrialized application is facilitated.

Description

technical field [0001] The invention relates to an electrolyte additive and a high-voltage electrolyte containing the electrolyte additive, belonging to the technical field of lithium ion batteries. Background technique [0002] As a new type of green high-energy battery, lithium-ion batteries are widely used in mobile phones, cameras, notebooks, etc. Portable devices such as computers. With the application in electric vehicles, cordless power tools and military, higher requirements are placed on the energy density of lithium-ion batteries, and LiNiMnO 4 , LiNi 0.5 mn 1.5 o 4 As well as some other nickel-rich ternary materials, lithium-ion deintercalation reactions can occur at higher voltages (greater than 4.2V), thus bringing new hope for improving the energy density of lithium-ion batteries. However, the carbonate-based electrolyte of conventional lithium-ion batteries is easy to decompose under high voltage, resulting in reduced charge and discharge efficiency and p...

Claims

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Application Information

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IPC IPC(8): H01M10/0567
CPCH01M10/0567H01M2300/0025Y02E60/10
Inventor 赖延清张凯王梦然洪波张治安李劼方静
Owner CENT SOUTH UNIV
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