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Electrolyte, preparation method for same and high-voltage lithium ion battery

An electrolyte and lithium salt technology, applied in the field of lithium-ion battery preparation, can solve the problems of few types and single effects, and achieve the effects of reducing dissolution, inhibiting deposition and reduction, and improving interface properties

Active Publication Date: 2014-09-17
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there are still few types of electrolyte additives for high-voltage lithium-ion batteries, and the effect is single.

Method used

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  • Electrolyte, preparation method for same and high-voltage lithium ion battery
  • Electrolyte, preparation method for same and high-voltage lithium ion battery
  • Electrolyte, preparation method for same and high-voltage lithium ion battery

Examples

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Effect test

Embodiment 1

[0031] A high-voltage lithium-ion battery electrolyte, mainly comprising organic solvents, conductive lithium salts and additives, said organic solvents are composed of cyclic carbonate solvents (ethylene carbonate EC), aromatic hydrocarbon solvents (fluorobenzene FB), linear carbonic acid The composition of ester solvent (ethyl methyl carbonate EMC), the weight ratio of EC and linear carbonate is EC:EMC=1:2, and the dosage of FB is 10.0wt.%. 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 3-fluorobenzyl Nitrile The dosage is 2.0wt.%.

[0032] The preparation method of electrolyte is:

[0033] (1) Mix the organic solvents in proportion and use them Molecular sieve, calcium hydride, lithium hydride purification, impurity removal, water removal;

[0034] (2) Dissolving the conductive ...

Embodiment 2

[0039] A high-voltage lithium-ion battery electrolyte, mainly comprising organic solvents, conductive lithium salts and additives, said organic solvents are composed of cyclic carbonate solvents (ethylene carbonate EC), aromatic hydrocarbon solvents (fluorobenzene FB), linear carbonic acid The composition of ester solvent (ethyl methyl carbonate EMC), the weight ratio of EC and linear carbonate is EC:EMC=1:2, and the dosage of FB is 8.0wt.%. The conductive lithium salt LiPF 6 The concentration in the organic solvent is 1.0mol / L, and the commonly used additives are vinylene carbonate in an amount of 1.0wt.% and propane sultone in an amount of 1.0wt.%, and the additives are 2,6-di Fluorobenzonitrile The dosage is 2.0wt.%.

[0040] The preparation method of electrolyte is:

[0041] (1) Mix the organic solvents in proportion and use them Molecular sieve, calcium hydride, lithium hydride purification, impurity removal, water removal;

[0042] (2) Dissolving the conductive li...

Embodiment 3

[0047] A high-voltage lithium-ion battery electrolyte mainly includes organic solvents, conductive lithium salts and additives, and the organic solvents are composed of cyclic carbonate solvents (ethylene carbonate EC), linear carbonate solvents (ethyl methyl carbonate EMC) It is composed of aromatic hydrocarbon solvent (fluorobenzene FB), the weight ratio of EC and linear carbonate is EC:EMC=1:2, and the dosage of FB is 5.0wt.%. 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 4-fluorophenylacetonitrile The dosage is 5wt.%.

[0048] The preparation method of electrolyte is:

[0049] (1) Mix the organic solvents in proportion and use them Molecular sieve, calcium hydride, lithium hydride purification, impurity removal, water removal;

[0050] (2) Dissolving the conductive lithium salt...

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Abstract

The invention discloses electrolyte, a preparation method for the same and a high-voltage lithium ion battery. The electrolyte mainly comprises an organic solvent, conductive lithium salt and an additive, wherein the organic solvent is prepared from more than one of a cyclic carbonate solvent, an aromatic hydrocarbon solvent and a linear solvent; the concentration of the conductive lithium salt in the organic solvent is 0.8 to 1.5mol / L; the using amount of the additive is 0.1 to 10.0 percent based on the weight of the organic solvent, and the additive is a halogenated cyanophenyl compound. After the additive is added into the electrolyte, a polymer film can be formed on the surface of each of a positive electrode and a negative electrode, so that the interface impedance of the electrodes / electrolyte is reduced, the decomposition of the electrolyte on the surface of an electrode material is suppressed, and the prolonging of cycle life of the high-voltage lithium ion battery (higher than 4.4V), the improvement of high / low-temperature performance of the high-voltage lithium ion battery and the suppression of gas expansion of the battery are facilitated.

Description

technical field [0001] The invention relates to the field of preparation of lithium-ion batteries, in particular to an electrolyte and a preparation method thereof, and a high-voltage lithium-ion battery prepared by using the electrolyte. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices due to their advantages such as high specific energy, small size, light weight, no memory effect, and long cycle life. However, with the rapid development of portable electronic products, higher and higher requirements are placed on the specific energy of lithium-ion batteries. At present, in order to improve the energy density of lithium-ion batteries, researchers mainly develop positive electrode materials with high capacity and high working voltage (greater than 4.2V), such as improving the working voltage of lithium-cobalt composite oxides and lithium-manganese composite oxides (greater than 4.2V). V), the development of lithium-nickel-ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122H01M10/0525H01M10/0567H01M10/058Y02E60/10
Inventor 仰永军李斌陈卫
Owner GUANGZHOU TINCI MATERIALS TECH
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