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A kind of electrolyte solution for lithium secondary battery and lithium secondary battery

A lithium secondary battery and electrolyte technology, which is applied in the field of lithium secondary battery and lithium secondary battery electrolyte, can solve problems such as poor cycle performance, and achieve the effect of improving cycle performance and safety performance

Active Publication Date: 2021-01-15
GUANGZHOU TINCI MATERIALS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This scheme mainly discloses the situation based on benzenesulfonic acid and the substituent is an alkyl group, which is mainly used to solve the problem of poor cycle performance of the traditional scheme

Method used

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  • A kind of electrolyte solution for lithium secondary battery and lithium secondary battery
  • A kind of electrolyte solution for lithium secondary battery and lithium secondary battery
  • A kind of electrolyte solution for lithium secondary battery and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) At room temperature, mix cyclic ethylene carbonate (EC), chain ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) according to the mass ratio EC:EMC:DMC=1:1:1 ;

[0038] (2) At room temperature, lithium hexafluorophosphate (LiPF 6 ) is dissolved in the solvent obtained in step (1), stirred evenly, and made into a conventional electrolyte solution of 1mol / L;

[0039] (3) Add diethyl p-toluenesulfonic acid acyloxymethyl phosphate (1-3) with the following structure in the conventional electrolyte prepared in step (2), and its consumption is 0.5% of the total mass of the electrolyte to obtain Electrolyte for lithium secondary battery of the present invention;

[0040]

[0041] (4) The electrolyte obtained in this embodiment is used for LiNi 0.6 co 0.2 mn 0.2 o 2 / Graphite pouch battery.

Embodiment 2～4

[0043] The preparation method of the positive and negative electrodes and the lithium-ion battery of Examples 2 to 4 is the same as that of Example 1, and the preparation method of the electrolyte is also the same as that of Example 1, except that the p-toluenesulfonic acid acyloxymethylphosphoric acid in the electrolyte The mass percentages of diethyl ester (1-3) are 1%, 3% and 5% respectively.

Embodiment 5

[0045] The solvent is changed to cyclic fluoroethylene carbonate (FEC) and ethylene carbonate (EC) and dimethyl carbonate (DMC) by mass ratio FEC: EC: DMC = 3: 1: 2 mixed, others are the same as in Example 1 .

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Abstract

The invention belongs to the lithium ion battery material field, and discloses an electrolyte additive for a lithium secondary battery and the lithium secondary battery. The electrolyte additive is abenzenesulfonic acid (phosphoric acid) anhydride compound, a benzenesulfonic acid (all silicic acid) anhydride compound, a benzenesulfonic acid (boric acid) anhydride compound and derivatives thereof.In the invention, the benzenesulfonic acid (phosphoric acid) anhydride compound, the benzenesulfonic acid (all silicic acid) anhydride compound, the benzenesulfonic acid (boric acid) anhydride compound and the derivatives thereof are used as the additive of a lithium secondary electrolyte. The additive can form a layer of thin and uniform organic lithium compound on a surface of an active material, an internal resistance of the lithium ion battery can be effectively reduced, and storage performance and safety performance of the electrolyte under a high-temperature / high-voltage condition can be solved; and a capacity retention ratio and cycle performance of the lithium ion battery are greatly increased.

Description

technical field [0001] The invention relates to the field of lithium secondary battery materials, in particular to a lithium secondary battery electrolyte and a lithium secondary battery. Background technique [0002] Under the dual effects of traditional fossil energy depletion and environmental protection, the development and application of lithium-ion batteries has risen to a new stage. However, the energy density of the lithium-ion battery system with ternary materials, lithium iron phosphate as the positive electrode and graphite as the negative electrode is far from meeting the battery requirements of electric vehicles. Therefore, improving the energy density of high lithium-ion batteries has become a current research hotspot. Studies have shown that increasing the voltage is conducive to increasing the energy density of lithium-ion batteries, but commercial electrolytes are prone to violent oxidation and decomposition reactions under high-pressure / high-temperature co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 义丽玲黄东海周邵云刘蕊
Owner GUANGZHOU TINCI MATERIALS TECH
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