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Non-aqueous electrolyte, preparing method of non-aqueous electrolyte and 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: 2014-09-24
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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  • Non-aqueous electrolyte, preparing method of non-aqueous electrolyte and lithium secondary battery
  • Non-aqueous electrolyte, preparing method of non-aqueous electrolyte and lithium secondary battery
  • Non-aqueous electrolyte, preparing method of non-aqueous electrolyte and lithium secondary battery

Examples

Experimental program
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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 electrolyte, a preparing method of the non-aqueous electrolyte and a lithium secondary battery. The non-aqueous electrolyte mainly comprises an organic solvent, conductive lithium salt and an additive. The organic solvent is composed of cyclic carbonate and a linear carbonic ester solvent. The concentration of the conductive lithium salt in the organic solvent is 0.8-1.5 mol / L, the additive is one or more of compounds, of which the dosage is 0.01-8.0 percent by weight, shown in the following general formula (1), and the formula can be seen in the specifications. The compounds are added into the non-aqueous electrolyte so that the service life of a lithium ion battery can be prolonged, the high voltage (larger than 4.2 V) can be improved, the high and low temperature performance can be enhanced, and the air expansion problem of the battery can be solved.

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 Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058
CPCY02E60/122H01M10/0525H01M10/0567H01M10/058Y02E60/10Y02P70/50
Inventor 仰永军李斌陈卫万华平
Owner GUANGZHOU TINCI MATERIALS TECH
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