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Additive and solvent of lithium secondary battery electrolyte

An electrolyte additive and lithium secondary battery technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low flash point and boiling point, limited application, low oxidation potential, etc., achieve small migration resistance and improve electrical conductivity rate, moving fast effect

Active Publication Date: 2011-10-05
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these film-forming compounds in the prior art usually have very low flash point and boiling point, and their oxidation potential is not high, which limits their further application

Method used

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  • Additive and solvent of lithium secondary battery electrolyte
  • Additive and solvent of lithium secondary battery electrolyte
  • Additive and solvent of lithium secondary battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Taking the mass of solvent and additive as 100%, take by weight respectively 20% ethylene carbonate (EC), 50% ethyl methyl carbonate (EMC) and 30% additive A and mix to obtain mixed solution, Then add lithium salt LiClO 4 , fully stirred evenly until the solution was clear without precipitation, and the electrolyte sample was obtained; among them, LiClO 4 The concentration of the substance is 1mol / L. Electrolyte samples were prepared in an argon-filled glove box. The structural formula of additive A is shown in formula A,

[0062]

[0063] Put the electrolyte sample into a platinum conductivity electrode (Shanghai Leici), and use a CHI604D electrochemical workstation (Shanghai Chenhua) to test it at -35°C (low temperature), 20°C (normal temperature) and 80°C (high temperature) respectively. ) under the AC impedance test, the corresponding conductivity is obtained by the ratio of the conductivity constant to the data on the x-axis at the lowest point read in the AC...

Embodiment 2

[0066] Based on the mass of the solvent and additives as 100%, weigh 20% ethylene carbonate, 50% ethyl methyl carbonate and 30% additive B and mix them to obtain a mixed solution, and then add lithium salt LiClO 4 , fully stirred evenly until the solution was clear without precipitation, and the electrolyte sample was obtained; among them, LiClO 4 The concentration of the substance is 1mol / L. Electrolyte samples were prepared in an argon-filled glove box. The structural formula of additive B is shown in formula B,

[0067]

[0068] Put the electrolyte sample into the platinum conductivity electrode (Shanghai Leici), and use the CHI604D electrochemical workstation (Shanghai Chenhua) to conduct AC impedance tests at -35°C, 20°C and 80°C respectively. The ratio of the rate constant to the data on the x-axis at the lowest point read in the AC impedance spectrum is used to obtain the corresponding conductivity, and the results are shown in Table 1.

[0069] A button-type half...

Embodiment 3

[0071] Based on the mass of the solvent and the additive as 100%, weigh 20% ethylene carbonate, 50% ethyl methyl carbonate and 30% additive C and mix them to obtain a mixed solution, then add lithium salt LiClO 4 , fully stirred evenly until the solution was clear without precipitation, and the electrolyte sample was obtained; among them, LiClO 4 The concentration of the substance is 1mol / L. Electrolyte samples were prepared in an argon-filled glove box. The structural formula of additive C is shown in formula C,

[0072]

[0073] Put the electrolyte sample into the platinum conductivity electrode (Shanghai Leici), and use the CHI604D electrochemical workstation (Shanghai Chenhua) to conduct AC impedance tests at -35°C, 20°C and 80°C respectively. The ratio of the rate constant to the data on the x-axis at the lowest point read in the AC impedance spectrum is used to obtain the corresponding conductivity, and the results are shown in Table 1.

[0074] A button-type half-...

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Abstract

The invention relates to an additive and a solvent of a lithium secondary battery electrolyte, belonging to the field of lithium battery materials. The structural formula of the additive is shown as the specification, wherein R represents an alkyl group of which the carbon atom number is 1-20 or an alkyl group of which the carbon atom number is 1-20 and hydrogen is replaced by halogen atoms; R' is one selected from the alkyl group of which the carbon atom number is 1-20, the alkyl group of which the carbon atom number is 1-20 and the hydrogen is replaced by the halogen atoms, an alcoxyl ethylof which the carbon atom number is 1-20, an alcoxyl ethyl of which the carbon atom number is 1-20 and hydrogen is replaced by halogen atoms, an aryl group of which the carbon atom number is 6-30 or an aryl group of which the carbon atom number is 6-30 and hydrogen is replaced by halogen atoms; the mass percent of the additive is 1-50%; and preferably the solvent is a solvent which contains isocyanate compounds with the mass percent of 1-50%. The electrolyte containing the additive and the solvent is high in conductivity at a low temperature, can form an SEI (solid electrolyte interface) film on the anode surface of the lithium secondary battery and is high in safety and oxygenolysis potential.

Description

technical field [0001] The invention relates to an electrolyte additive and a solvent for a lithium secondary battery, in particular to an electrolyte additive for a lithium secondary battery suitable for working in a low temperature environment, and also to a solvent for the electrolyte of a lithium secondary battery. The solvent can be reduced on an anode of a lithium secondary battery to form a solid electrolyte interface (SEI) film, and belongs to the field of lithium battery materials. Background technique [0002] In recent years, with the rapid development of the electronics and information industries, the wide application of mobile communications, digital processors, and portable computers, the continuous advancement of space technology and defense equipment technology requirements, and the research and development of electric vehicles (EV), people have become more and more interested in chemistry. Demand for power supplies, especially high-performance secondary batt...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 陈人杰吴锋张海琴向晋李丽朱露陈实
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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