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A kind of lithium-ion battery electrolyte and lithium-ion battery with high voltage resistance

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of cycle performance deterioration, weak high-voltage resistance, lithium-ion battery failure, etc., to achieve reduced flammability, low vapor pressure, large capacity and cycle stability Effect

Active Publication Date: 2019-10-25
QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the electrolyte of traditional lithium-ion batteries has relatively weak high-voltage resistance
For example, the positive electrode active material with a high charge cut-off voltage has strong oxidative properties under high temperature and high pressure, so that the electrolyte is easily oxidized and decomposed, resulting in a large amount of gas, which in turn causes the lithium-ion battery to fail.
In addition, the cycle performance of lithium-ion batteries will deteriorate due to the oxidative decomposition of the electrolyte and the side reactions of the positive electrode active material itself, such as the evolution of oxygen or the dissolution of transition metal ions during the cycle.

Method used

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  • A kind of lithium-ion battery electrolyte and lithium-ion battery with high voltage resistance

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preparation example Construction

[0039] The preparation method of the above-mentioned lithium-ion battery is not particularly limited in the present application, and a method well known to those skilled in the art can be implemented step by step.

[0040] Specifically, the preparation method of the lithium ion battery comprises the following steps:

[0041] 1) Use special solvents and binders to mix with powdery positive and negative active materials respectively, and after stirring evenly, make slurry positive and negative materials.

[0042] 2) The positive and negative electrode slurries are evenly coated on the surface of the metal foil by an automatic coating machine, and are automatically cut after automatic drying to make positive electrode sheets and negative electrode sheets.

[0043] 3) According to the order of positive electrode, diaphragm, negative electrode and diaphragm from top to bottom, the electrolyte is wound and injected, and the finished battery is made through the processes of formation...

Embodiment 1

[0047] Prepare ethylene carbonate, methyl vinyl carbonate, tetramethyl sulfone, tris(2,2,2-trifluoroethyl) phosphite and methyl ethyl ketone in a mass ratio of 4:3:3:1:1 into a multi-component blending solvent, and then add lithium salt (lithium dioxalate borate), inorganic film-forming additive (lithium sulfide) and anti-overcharge protection additive (biphenyl) to the above-mentioned multi-component blending solvent to obtain high-voltage lithium-ion Battery electrolyte 1, wherein the amount of lithium dioxalate borate is 1.2mol / L, the amount of the inorganic film-forming additive accounts for 8% of the total mass of the electrolyte, and the anti-overcharge protection additive accounts for 5% of the total mass of the electrolyte .

[0048] A lithium-ion battery 1 was prepared using the above-mentioned high-voltage-resistant lithium-ion battery electrolyte 1 by a conventional method.

Embodiment 2

[0050] Prepare ethylene carbonate, methyl vinyl carbonate, tetramethyl sulfone, tris(2,2,2-trifluoroethyl) phosphite and methyl ethyl ketone in a mass ratio of 8:7:5:3:2 into a multi-component blending solvent, and then add lithium salt (lithium dioxalate borate), inorganic film-forming additive (lithium sulfide) and anti-overcharge protection additive (biphenyl) to the above-mentioned multi-component blending solvent to obtain high-voltage lithium-ion Battery electrolyte 2, wherein the amount of lithium dioxalate borate is 1.5mol / L, the amount of the inorganic film-forming additive accounts for 8% of the total mass of the electrolyte, and the anti-overcharge protection additive accounts for 5% of the total mass of the electrolyte .

[0051] The lithium-ion battery 2 is prepared by using the above-mentioned high-voltage-resistant lithium-ion battery electrolyte 2 by a conventional method.

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Abstract

The invention relates to high-voltage-resistant lithium ion battery electrolyte and a lithium ion battery. The high-voltage-resistant lithium ion battery electrolyte is prepared from organic solvents,lithium slats, inorganic film forming additives and anti-overcharging protection additives, wherein the organic solvents are prepared from vinyl carbonic ester, ethyl methyl carbonate, tetramethylenesulfone, tri(2,2,2-trifluoroethyl)phosphite ester and methyl ethyl ketone according to the mass ratio of (4 to 8):(3 to 7):(3 to 5):(1 to 3):(1 to 2). The high-voltage-resistant lithium ion battery electrolyte has the advantages that the safety of the lithium ion battery is improved; the electrochemical performance of the lithium ion battery is improved, so that the battery performance is excellent.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage-resistant lithium-ion battery electrolyte and a lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high output voltage, long cycle life, and low environmental pollution. They play an extremely important role in the fields of electronic products, electric vehicles, aerospace, and energy storage. [0003] A lithium-ion battery mainly includes a positive electrode, a negative electrode, a separator, and an electrolyte. Among them, the electrolyte is a solution with ion conductivity, which is the medium for the migration of lithium ions between the positive and negative electrodes, and is an important part of the battery. Lithium ions in lithium-ion batteries can move between the positive and negative electrodes through the electrolyte. During the charging and discharging process of lithi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0569H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/0569H01M10/4235H01M2300/0042Y02E60/10
Inventor 汤依伟吴理觉文定强
Owner QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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