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An electrolyte additive and an electrolyte containing the additive and a lithium secondary battery

An electrolyte and additive technology, which is applied in the field of electrolyte additives, electrolyte and lithium secondary batteries, can solve the problems of positive electrode material morphology change, structural collapse, etc., to optimize the surface film of positive and negative electrodes, improve cycle performance, and good Effect of charge and discharge performance

Active Publication Date: 2020-06-09
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional commercial electrolyte is easy to oxidize and decompose on the surface of the electrode under high pressure, and the oxidative decomposition reaction of the electrolyte itself will also promote malignant reactions such as morphology changes and structural collapse of the positive electrode material.

Method used

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  • An electrolyte additive and an electrolyte containing the additive and a lithium secondary battery
  • An electrolyte additive and an electrolyte containing the additive and a lithium secondary battery
  • An electrolyte additive and an electrolyte containing the additive and a lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) cyclic carbonate solvent ethylene carbonate (EC) and linear carbonate solvent ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) by mass ratio EC:EMC:DEC=3:5: 2 Mix, and use molecular sieves, calcium hydride, lithium hydride to purify and remove impurities and water;

[0031] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolved in the solvent obtained in step (1), the final concentration of the conductive lithium salt is 1.0mol / L, and stirred evenly to obtain a common electrolyte;

[0032] (3) Add 4-methyl-N-toluenesulfonylbenzenesulfonamide (purchased from TCI) to the ordinary electrolyte prepared in step (2) in an amount of 0.5% of the mass of the ordinary electrolyte to obtain the final electrolyte.

[0033] The final electrolytic solution gained in this embodiment and the common electrolytic solution of step (2) are used for LiNi 0.6 co 0.2 mn 0.2 o 2 / Graphite soft pack battery for cycle performance comparison, the results are as fol...

Embodiment 2

[0035] (1) Cyclic carbonate solvent ethylene carbonate (EC) and linear carbonate solvent ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) are by mass ratio EC:EMC:DMC=3:5: 2 Mix, and use molecular sieves, calcium hydride, lithium hydride to purify and remove impurities and water;

[0036] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolved in the solvent obtained in step (1), the final concentration of the conductive lithium salt is 1.0mol / L, and stirred evenly to obtain a common electrolyte;

[0037] (3) Adding 4-methyl-N-toluenesulfonylbenzenesulfonamide to the ordinary electrolyte prepared in step (2), the dosage is 1.0% of the mass of the ordinary electrolyte to obtain the final electrolyte.

Embodiment 3

[0039] (1) Cyclic carbonate solvent ethylene carbonate (EC) and linear carbonate solvent ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) are by mass ratio EC:EMC:DMC=3:5: 2 Mix, and use molecular sieves, calcium hydride, lithium hydride to purify and remove impurities and water;

[0040] (2) At room temperature, the conductive lithium salt LiPF 6 Dissolved in the solvent obtained in step (1), the final concentration of the conductive lithium salt is 1.0mol / L, and stirred evenly to obtain a common electrolyte;

[0041] (3) Adding 4-methyl-N-toluenesulfonylbenzenesulfonamide to the ordinary electrolyte prepared in step (2), the dosage is 3.0% of the mass of the ordinary electrolyte to obtain the final electrolyte.

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Abstract

The invention belongs to the field of a lithium ion battery material, and discloses an electrolyte additive and an electrolyte comprising the additive, and a lithium secondary battery. The electrolyteadditive is 4-methyl-N-tosyl benzene sulfonamide. A cyclic carbonate solvent and a linear carbonate solvent are mixed, and then are subjected to purification, impurity removal and dewatering, and a conductive lithium salt is added in the room temperature condition to obtain a common electrolyte; and next, an additive which accounts for 0.5-3.0% of the mass of the common electrolyte is added to the common electrolyte to obtain the final electrolyte. By taking 4-methyl-N-tosyl benzene sulfonamide as the additive of the lithium ion electrolyte, the cycle performance of the lithium secondary battery at a high pressure is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and in particular relates to an electrolyte additive, an electrolyte containing the additive, and a lithium secondary battery. Background technique [0002] Among the existing commercial secondary batteries, lithium secondary batteries have the highest specific energy and the best cycle performance, and because of the diversity of electrode materials, they have broad development prospects as energy storage batteries. [0003] With the advancement of technology and the continuous development of the market, it is increasingly important and urgent to increase the energy density of lithium secondary batteries. Therefore, increasing the operating voltage of lithium secondary batteries to increase the energy density of batteries is the focus of current research. However, conventional commercial electrolytes are easy to oxidize and decompose on the electrode surface under high pressure, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 李伟善廖波李鸿英许梦清邢丽丹廖友好
Owner SOUTH CHINA NORMAL UNIVERSITY
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