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Electrolyte for lithium secondary battery and lithium secondary battery including electrolyte

A lithium secondary battery, electrolyte technology, applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problem of low temperature charging performance and high temperature performance being difficult to balance.

Active Publication Date: 2021-03-05
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the low-temperature charging performance and high-temperature performance of the existing lithium secondary battery are difficult to balance, to provide an electrolyte that can widen the service temperature of the lithium secondary battery and a lithium secondary battery including the electrolyte, The electrolyte can improve the charging performance (especially low-temperature charging performance) of the lithium secondary battery at the same time, while ensuring that the lithium secondary battery has better high-temperature performance (such as significantly improved high-temperature cycle performance, etc.)

Method used

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  • Electrolyte for lithium secondary battery and lithium secondary battery including electrolyte
  • Electrolyte for lithium secondary battery and lithium secondary battery including electrolyte
  • Electrolyte for lithium secondary battery and lithium secondary battery including electrolyte

Examples

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preparation example Construction

[0034] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0035] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0036] The compound represented by formula (III) used in the following examples was purchased from Chemtrity Co., Ltd., and its English name is tris((difluorophosphino)oxy)methane.

Embodiment 1

[0038] A lithium secondary battery electrolyte, comprising an organic solvent, lithium salt and additives, the organic solvent accounts for 87.99wt% of the total mass of the lithium secondary battery electrolyte, and it is composed of ethylene carbonate and ethyl methyl carbonate, wherein, The mass ratio of ethylene carbonate and ethyl methyl carbonate is 1:2. The lithium salt is selected from lithium hexafluorophosphate, and the lithium salt accounts for 12 wt% of the total mass of the electrolyte solution of the lithium secondary battery. The additive is selected from the compounds represented by the above formula (III), and its dosage accounts for 0.01wt% of the total mass of the electrolyte solution of the lithium secondary battery. The electrolyte solution of this embodiment is used for LiNi 0.6 co 0.2 mn 0.2 o 2 / Graphite pouch battery.

Embodiment 2-5 and comparative example 1-4

[0040]The only difference lies in the selection and proportion of the components in the electrolyte, as shown in Table 1.

[0041] The selection and proportioning of each component in the electrolyte in table 1 embodiment 1-5 and comparative example 1-4

[0042]

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PUM

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Abstract

The present invention provides an electrolyte for a lithium secondary battery and a lithium secondary battery comprising the electrolyte. The electrolyte for a lithium secondary battery comprises an organic solvent, a lithium salt, and at least one additive having a structural formula represented by formula (I). The additive shown in the formula (I) can form a lithium-containing -PF2-type compoundon the surfaces of a positive electrode and a negative electrode when the lithium secondary battery is charged for the first time, the compound has the characteristics of high stability and high lithium ion content, and the low-temperature charging performance and the high-temperature performance of the battery can be remarkably improved. Meanwhile, the additive shown in the formula (I) providedby the invention has reasonable F element content, so that the formation of LiF on the surface of the electrode can be remarkably inhibited, the interface impedance is reduced, and the charge-discharge reversibility of lithium ions is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium secondary batteries, and in particular relates to an electrolyte solution for a lithium secondary battery and a lithium secondary battery including the electrolyte solution. Background technique [0002] At present, lithium secondary batteries with good cycle performance and high energy density have been widely used in various fields of life, such as mobile phones, notebook computers, electric vehicles, artificial intelligence and so on. At the same time, lithium secondary batteries have been applied to outdoor equipment such as hovercraft and large-scale energy storage. [0003] In general, a lithium secondary battery is manufactured by using a material capable of reversibly intercalating and deintercalating lithium ions as a positive electrode active material and a negative electrode active material and filling an electrolyte between the positive electrode and the negative electrode. Most of th...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025
Inventor 廖波李素丽徐延铭李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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