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A lithium-ion battery electrolyte and a lithium-ion battery comprising the electrolyte

A lithium-ion battery and electrolyte technology, which is applied in the electrolyte field of high-voltage-silicon-carbon system lithium-ion batteries, can solve the problems of battery cycle performance to be improved, and achieve high residual capacity, recoverable capacity, and cycle capacity retention rate High, the effect of improving cycle performance

Active Publication Date: 2021-07-27
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the invention can increase the high-voltage and low-temperature performance cycle of the battery, the normal and high-temperature cycle performance of the battery needs to be improved

Method used

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  • A lithium-ion battery electrolyte and a lithium-ion battery comprising the electrolyte
  • A lithium-ion battery electrolyte and a lithium-ion battery comprising the electrolyte
  • A lithium-ion battery electrolyte and a lithium-ion battery comprising the electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this example, the preparation of lithium-ion battery electrolyte solutions A1-1 to A1-4 is provided. The preparation steps of the electrolyte solution are: mix dimethyl carbonate, ethylene carbonate and propylene carbonate at a ratio of 1:1:1 The mass ratio is mixed as an organic solvent; add additives to the organic solvent, after mixing evenly, add LiPF 6 , to obtain a mixed solution, which is the electrolyte. The relationship between the number of the obtained electrolyte and the composition of the electrolyte additive is shown in Table 1-1:

[0042] Table 1-1

[0043]

Embodiment 2

[0049] In this embodiment, a preparation of electrolyte solutions A2-1 to A2-13 for lithium-ion batteries is provided. The preparation steps of the electrolyte solution are: mix dimethyl carbonate, ethylene carbonate and propylene carbonate at a ratio of 1:1 : Mixed with a mass ratio of 1, as an organic solvent; add additives to the organic solvent, mix well, add LiPF 6 , to obtain a mixed solution, which is the electrolyte. The relationship between the number of the obtained electrolyte and the composition of the electrolyte additive is shown in Table 2-1:

[0050] table 2-1

[0051]

[0052]

Embodiment 3

[0058] The electrolyte solution prepared in Example 1-2 and Comparative Example 1-2 was used to prepare a lithium ion battery, and the lithium ion battery included a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte solution.

[0059] Production of the positive electrode sheet:

[0060] The positive electrode active material lithium cobaltate (LiCoO 2 ), the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) are fully stirred and mixed in N-methylpyrrolidone (NMP) solvent at a weight ratio of 96:2:2 to form a uniform positive electrode slurry; The slurry was coated on the positive electrode current collector AA foil, dried and cold pressed to obtain the positive electrode sheet.

[0061] Production of negative electrode sheet:

[0062] Negative electrode active material silicon carbon, conductive agent acetylene black, binder styrene-hexyl rubber (SBR), thickener sodium carboxymethyl cellulose (CMC) in an approp...

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Abstract

The invention provides a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte, the lithium ion battery electrolyte comprises an organic solvent, an electrolyte lithium salt and an additive, the additive comprises adiponitrile, propylene sulfite and Lithium sulfate; the electrolyte used in lithium ion batteries can form a stable passivation protective film on the surface of both positive and negative electrodes, so as to improve the cycle performance of lithium ion batteries with high voltage matching silicon carbon negative electrodes, while reducing the battery expansion rate, Reduce internal resistance and improve the stability and safety of lithium-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of battery electrolyte, and relates to a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte, in particular to an electrolyte for a high voltage-silicon carbon system lithium ion battery. Background technique [0002] Due to its excellent performance, lithium-ion batteries have become the most important energy storage devices in various electronic products, wireless communications and transportation facilities. [0003] At present, commercial lithium-ion batteries mainly use graphite-like carbon materials as negative electrode active materials. However, carbon-based anode materials cannot meet the requirements of miniaturization of electronic equipment and high-power and high-capacity requirements of lithium-ion batteries for vehicles due to their low specific capacity and safety problems caused by lithium deposition. High-voltage matching silicon-carbon anodes with energy d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 王健葛辉明刘金成
Owner EVE ENERGY CO LTD
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