Non-aqueous electrolyte for lithium ion battery and lithium ion battery comprising same

A non-aqueous electrolyte and lithium-ion battery technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problem of large impedance, lack of high-temperature effect of low-impedance additives, and inability to balance high-temperature performance and low-temperature performance, etc. problems, to achieve the effect of taking into account low-temperature performance, excellent high-temperature storage performance, and reducing dissolution

Inactive Publication Date: 2021-05-04
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most lithium-ion battery products have the problem that high-temperature performance and low-temperature performance cannot be balanced. For this reason, additives are usually added to the electrolyte to improve the high-low temperature performance of lithium-ion batteries.
How

Method used

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  • Non-aqueous electrolyte for lithium ion battery and lithium ion battery comprising same
  • Non-aqueous electrolyte for lithium ion battery and lithium ion battery comprising same
  • Non-aqueous electrolyte for lithium ion battery and lithium ion battery comprising same

Examples

Experimental program
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Effect test

Embodiment 1-9 and comparative example 2-7

[0068] The preparation process of Examples 1-9 and Comparative Examples 2-7 is the same as Comparative Example 1, the only difference being that the components and contents of the electrolyte are different, specifically:

[0069] In a glove box filled with argon gas and qualified water and oxygen content, mix ethylene carbonate, diethyl carbonate, and ethyl methyl carbonate in a mass ratio of 30:45:25 (the solvent and additives need to be normalized together) , and then quickly add additives (at least one of the compounds shown in formula 1 and at least one of the compounds shown in formula 2) to it, and freeze the mixed solution at a low temperature of about -10°C for 2-5h, and then Quickly add 13wt% of fully dry lithium hexafluorophosphate (LiPF 6 ), stirred evenly, and after the moisture and free acid were detected to be qualified, the electrolytes of Examples 1-9 and Comparative Examples 2-7 were obtained.

[0070] The specific components and contents added are shown in T...

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Abstract

The invention provides a non-aqueous electrolyte for a lithium ion battery and the lithium ion battery comprising the non-aqueous electrolyte. The non-aqueous electrolyte comprises a lithium salt and a non-aqueous organic solvent, and further comprises at least one of compounds as shown in a formula 1 and at least one of compounds as shown in a formula 2, wherein the compounds can form protective films at a positive electrode and a negative electrode, through the synergistic effect between the protective films, the positive electrode is protected while the negative electrode is protected to certain extent, and the lithium ion battery has better high-temperature storage performance and cycle performance and meanwhile has low-temperature performance.

Description

technical field [0001] The invention belongs to the technical field of electrolyte solution for lithium ion batteries, and in particular relates to a nonaqueous electrolyte solution for lithium ion batteries and a lithium ion battery including the nonaqueous electrolyte solution. Background technique [0002] Since its commercialization, lithium-ion batteries have been widely used in digital, energy storage, power, military aerospace and communication equipment and other fields because of their light weight, high specific energy, no memory effect, and good cycle performance. With the wide application of lithium-ion batteries, consumers have put forward higher requirements for the energy density, cycle life, high temperature performance, safety and other performance of lithium-ion batteries. To improve the energy density, on the one hand, it is possible to increase the charging voltage of the positive electrode, or to use a silicon negative electrode with better capacity. Mo...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 曾长安李素丽李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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