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Electrolyte, preparation method and application of electrolyte, lithium ion battery and application of lithium ion battery

A technology of electrolyte and lithium salt, applied in the field of electrolyte, can solve the problems of increasing the internal resistance of the battery, shortening the service life of the battery, and destroying the cycle performance, and achieves the effect of improving the cycle performance, reducing the dissolution, and inhibiting the oxidative decomposition.

Inactive Publication Date: 2019-03-01
GUANGDONG JIANA ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, a variety of high-voltage positive electrode materials have been developed, but with the increase of the operating voltage, the conventional electrolyte will not only oxidize and decompose itself, but also oxidize and decompose on the surface of the positive electrode material, which eventually leads to an increase in the internal resistance of the battery. High, the cycle performance is destroyed, and the service life of the battery is shortened

Method used

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  • Electrolyte, preparation method and application of electrolyte, lithium ion battery and application of lithium ion battery
  • Electrolyte, preparation method and application of electrolyte, lithium ion battery and application of lithium ion battery
  • Electrolyte, preparation method and application of electrolyte, lithium ion battery and application of lithium ion battery

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preparation example Construction

[0057] According to the second aspect of the present invention, there is provided a method for preparing the above electrolytic solution, comprising the following steps: dissolving the inorganic conductive lithium salt in a solvent, and then adding additives to obtain the electrolytic solution;

[0058] In the invention, the electrolytic solution can be obtained by dissolving the inorganic conductive lithium salt and the additive in the solvent. The process is simple, easy to operate, easy to implement, no special restrictions on the environment, site, equipment, etc., low requirements on equipment, low investment cost, strong practicability and adaptability, is a simple, easy to control, environment-friendly, The low-cost electrolyte preparation method can realize high-volume production at low cost, and is easy to popularize and apply.

[0059] As a preferred embodiment, the temperature at which the inorganic conductive lithium salt is dissolved in the solvent is 20-40° C., t...

Embodiment 1

[0074] 1. An electrolyte comprising additives, inorganic conductive lithium salts and solvents.

[0075] The additive is fluorine-containing phosphate, the chemical formula is Na 2 PO 3 F, the mass fraction of additives in the electrolyte is 0.5%.

[0076] Inorganic conductive lithium salt is LiPF 6 , the concentration of the inorganic conductive lithium salt in the electrolyte is 1mol / L.

[0077] The solvents were ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) in a volume ratio of 1:1:1.

[0078] 2. A method for preparing an electrolyte, comprising the following steps: dissolving an inorganic conductive lithium salt in a solvent, and then adding additives to obtain an electrolyte;

[0079] Specifically:

[0080] (1) Mix ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) in a volume ratio of 1:1:1 in an argon-containing glove box, and remove them with molecular sieves and lithium hydride. Water removes imp...

Embodiment 2

[0088] 1. An electrolyte comprising additives, inorganic conductive lithium salts and solvents.

[0089] The additive is fluorine-containing phosphate, the chemical formula is CaPO 3 F, the mass fraction of additives in the electrolyte is 1.0%.

[0090] Inorganic conductive lithium salt is LiPF 6 , the concentration of the inorganic conductive lithium salt in the electrolyte is 1mol / L.

[0091] The solvents were ethylene carbonate (EC) and ethyl methyl carbonate (EMC) in a volume ratio of 1:1.

[0092] 2. A method for preparing an electrolyte, comprising the following steps: dissolving an inorganic conductive lithium salt in a solvent, and then adding additives to obtain an electrolyte;

[0093] Specifically:

[0094] (1) Mix ethylene carbonate (EC) and dimethyl carbonate (DMC) in an argon-containing glove box according to a volume ratio of 1:1, and use molecular sieves and lithium hydride to remove water and impurities to obtain a treated mixed solvent .

[0095] (2) In...

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Abstract

The invention provides an electrolyte, a preparation method and application of the electrolyte, a lithium ion battery and application of the lithium ion battery, and belongs to the technical field ofelectrolytes. The electrolyte provided by the invention is prepared from an additive, inorganic conductive lithium salt and a solvent, wherein the additive is fluorine-containing phosphate, and the chemical formula of the fluorine-containing phosphate is M1xM21-0.5xPO3F and / or M1PO2F2. The electrolyte containing the fluorine-containing phosphate is used in the lithium ion battery, the electrochemical activity of the surface of a positive electrode material can be reduced in a circulation process, oxidative decomposition of the solvent of the electrolyte is inhibited, the structure of the positive electrode material is stabilized, and the cycling stability and the rate performance of the lithium ion battery under high voltage are improved.

Description

technical field [0001] The invention belongs to the technical field of electrolytes, and in particular relates to electrolytes, preparation methods and applications thereof, lithium ion batteries and applications thereof. Background technique [0002] As a new type of green high-energy battery, lithium-ion batteries are widely used in mobile phones, cameras, notebooks, etc. Portable devices such as computers. In recent years, with the popularization of portable electronic devices and the development of electric tools and electric vehicles, higher requirements have been put forward for lithium-ion batteries——on the basis of ensuring or improving the original energy density, they are increasingly required to be lighter and thinner. Therefore, increasing the operating voltage of lithium-ion batteries to increase the energy density of batteries is the focus of current research. [0003] At present, a variety of high-voltage positive electrode materials have been developed, but...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 汤依伟杨幸彭灿张颖吴剑尚国志
Owner GUANGDONG JIANA ENERGY TECH CO LTD
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