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A kind of non-aqueous electrolyte and its application in lithium battery

A non-aqueous electrolyte, lithium salt technology, applied in non-aqueous electrolyte batteries, lithium batteries, secondary batteries, etc., can solve the problems of high temperature and cycle performance deterioration of lithium batteries, safety risks, micro-short circuits, etc., to avoid Corrosion effect, high energy density, low resistance effect

Active Publication Date: 2022-04-29
FULLYMAX BATTERY CO LTD
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are non-aqueous electrolytes in the prior art, but they have the disadvantages of large impedance and easy gas production, which cannot solve the problem of metal ions in the positive electrode being eluted and deposited on the negative electrode, which can easily cause micro-short circuits, deteriorating the high temperature and cycle performance of lithium batteries, and even security risk

Method used

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  • A kind of non-aqueous electrolyte and its application in lithium battery
  • A kind of non-aqueous electrolyte and its application in lithium battery
  • A kind of non-aqueous electrolyte and its application in lithium battery

Examples

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Embodiment 1

[0027] This embodiment provides a non-aqueous electrolyte and its application in lithium batteries, and also provides a preparation method of the non-aqueous electrolyte and lithium batteries. The composition of the non-aqueous electrolyte includes lithium salts, solvents and functional additives, which not only have the effect of assisting film formation, but also can effectively complex metal ions, prevent metal ions from depositing on the negative electrode, and improve the high temperature resistance and performance of lithium batteries. cycle performance.

[0028] The lithium salt in the non-aqueous electrolyte is lithium hexafluorophosphate, the solvent is a mixture of ethylene carbonate, diethyl carbonate and ethyl methyl carbonate, and the mass ratio of ethylene carbonate, diethyl carbonate and ethyl methyl carbonate is 1:1 :1. The amount of functional additive added is 0.5% of the total mass of the electrolyte, and the functional additive is a compound shown in struc...

Embodiment 2

[0054] This embodiment provides a non-aqueous electrolyte and its application in lithium batteries, and also provides a preparation method of the non-aqueous electrolyte and lithium batteries. The difference from Example 1 is that the functional additives are different. The functional additive of this embodiment is a compound shown in structural formula 2, and the structural formula is as follows:

[0055]

[0056] The substituents of R6 are all selected from alkylene, sulfone or fluoroalkylene with 1 to 4 carbon atoms, preferably ethylene in this embodiment; the substituents of R7 to R10 are all selected from The alkylene group having a number of 1 to 4 is preferably an ethylene group.

[0057] The preparation method of the electrolyte is the same as in Example 1, but functional additives need to be replaced. The preparation method of the lithium battery is also the same as in Example 1.

Embodiment 3

[0059] This embodiment provides a non-aqueous electrolyte and its application in lithium batteries, and also provides a preparation method of the non-aqueous electrolyte and lithium batteries. The difference from Example 1 is that the functional additives are different. The functional additive of this embodiment is a compound shown in structural formula 3, and the structural formula is as follows:

[0060]

[0061] The substituents of R11 are all selected from alkylene groups, sulfone groups or fluoroalkylene groups with 1 to 4 carbon atoms, and dimethyl sulfone is preferred in this embodiment; the substituents of R12 to R15 are selected from The alkylene or fluoroalkylene group having 1 to 4 atoms is preferably a propylene group.

[0062] The preparation method of the electrolyte is the same as in Example 1, but functional additives need to be replaced. The preparation method of the lithium battery is also the same as in Example 1.

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Abstract

The invention provides a non-aqueous electrolytic solution and its application in lithium batteries. The non-aqueous electrolytic solution includes a lithium salt, a solvent and a functional additive, and the functional additive includes any one of structural formulas 1 to 5. The structural formula compound, this functional additive not only has the effect of film formation, but also can provide lone pair electrons to complex the metal ions and other metal impurity ions dissolved from the positive electrode, so as to avoid the deposition of metal ions on the negative electrode and affect the safety performance and cycle of lithium batteries performance. The lithium battery of the present invention includes a battery case, a pole core and an electrolyte, the pole core and the electrolyte are sealed in the battery case, the pole core includes a positive pole, a negative pole and a diaphragm between the positive pole and the negative pole, the electrolytic The liquid is the above-mentioned non-aqueous electrolyte, which has the advantages of high energy density, high cycle life and high safety performance.

Description

technical field [0001] The invention belongs to the technical field of lithium battery processing, and in particular relates to a nonaqueous electrolyte and its application in lithium batteries. Background technique [0002] Lithium battery is a new type of green battery, which has the advantages of high energy density and no memory effect. It is widely used in 3C products, automobile industry and other fields. The electrolyte is the "blood" of the lithium battery, which has an extremely important impact on the performance of the battery capacity, initial efficiency, working voltage, cycle life, and high temperature performance. With the expansion of the application range of lithium batteries, the market has increasingly stringent requirements on the performance of lithium batteries. Lithium batteries are developing in the direction of high energy density, high cycle life, and high safety performance. This is a harsh test for the electrolyte. [0003] There are many factors...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/052H01M10/42
CPCH01M10/0567H01M10/052H01M10/4235Y02E60/10
Inventor 谭熠伟刘长昊麦敬辉邓健想邱云珍
Owner FULLYMAX BATTERY CO LTD
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