A kind of nonaqueous electrolytic solution and its preparation method and a kind of lithium secondary battery

A non-aqueous electrolyte and lithium salt technology, which is applied in the manufacture of non-aqueous electrolyte batteries, secondary batteries, electrolyte batteries, etc., can solve the problems of affecting the electrochemical performance of batteries, high interfacial film impedance, and low Coulombic efficiency, and achieve improvement Effects of low temperature discharge performance, reduction of interface resistance, and improvement of ion migration rate

Active Publication Date: 2016-06-15
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium-ion battery prepared by the organic electrolyte containing the substance will lose more Li during the first charge and discharge process. + , leading to low Coulombic efficiency and high impedance of the formed interfacial film, which affects the electrochemical performance of the battery

Method used

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  • A kind of nonaqueous electrolytic solution and its preparation method and a kind of lithium secondary battery
  • A kind of nonaqueous electrolytic solution and its preparation method and a kind of lithium secondary battery
  • A kind of nonaqueous electrolytic solution and its preparation method and a kind of lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A non-aqueous electrolytic solution mainly includes an organic solvent, a conductive lithium salt and additives, the organic solvent is composed of a cyclic carbonate solvent (ethylene carbonate EC) and a linear carbonate solvent (ethyl methyl carbonate EMC), EC And the weight ratio of linear carbonate is EC:EMC=1:2. The conductive lithium salt LiPF 6 Concentration in organic solvent is 1.0mol / L, and described common additive is the vinylene carbonate of 1.0wt.% consumption and the propane sultone that consumption is 1.0wt.%, and described additive is 5-methylthio Tetrazolium, consumption 0.5wt.%. The chemical formula of the additive is as follows:

[0030]

[0031] The preparation method of electrolyte is:

[0032] (1) Mix the organic solvents in proportion and use them Molecular sieve, calcium hydride, lithium hydride purification, impurity removal, water removal;

[0033] (2) Dissolving the conductive lithium salt in the above-mentioned organic solvent at ro...

Embodiment 2

[0038] The preparation method of the non-aqueous electrolytic solution of the present embodiment is the same as that of Example 1, the difference is that, using 1.0wt.% of 5-methylthiotetrazole in an amount, the non-aqueous electrolytic solution thus prepared is prepared according to the 1 The same method was applied to test the performance of the full battery.

Embodiment 3

[0040] The preparation method of the non-aqueous electrolytic solution of the present embodiment is the same as that of Example 1, the difference is that, using 3.0wt.% of 5-methylthiotetrazole in an amount, the non-aqueous electrolytic solution prepared in this way will 1 The same method was applied to test the performance of the full battery.

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Abstract

The invention discloses a non-aqueous electrolytic solution, a preparation method thereof and a lithium secondary battery, mainly comprising the following raw materials: an organic solvent, a conductive lithium salt and an additive, and the organic solvent is composed of a cyclic carbonate and a linear carbonate solvent Composition, the concentration of the conductive lithium salt in the organic solvent is 0.8-1.5mol / L, the additive is at least one of the compounds represented by the following general formula (I) in an amount of 0.01-8.0wt.%, the formula Among them, the above-mentioned compounds can be added to the non-aqueous electrolyte to improve the cycle life of the lithium-ion battery, as well as high voltage (greater than 4.2V), high and low temperature performance and suppress the gas swelling problem of the battery.

Description

technical field [0001] The invention relates to the field of lithium ion battery preparation, in particular to a nonaqueous electrolyte, a preparation method thereof and a lithium secondary battery. Background technique [0002] Lithium-ion batteries have become the fastest-growing and most valued new high-energy batteries because of their advantages such as high specific energy and long cycle life. Currently commercialized lithium-ion batteries can basically meet the needs of most household electronic devices, such as digital cameras, mobile phones, and notebook computers. However, in recent years, with the continuous updating of digital products and the vigorous development of electric vehicles, the requirements for the service life, high and low temperature performance, safety, and magnification of lithium-ion batteries have become higher and higher. Therefore, the research and development of lithium-ion battery materials is of great significance. [0003] Lithium-ion b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0567H01M10/058Y02E60/10Y02P70/50
Inventor 仰永军李斌陈卫万华平
Owner GUANGZHOU TINCI MATERIALS TECH
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