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Electrolyte additive, electrolyte containing additive and lithium battery using electrolyte

An electrolyte additive and electrolyte technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of high LUMO, low molecular stability, difficult to decompose and form films, etc., to achieve improved chemical stability and improved The effect of cycle performance

Active Publication Date: 2021-07-02
HUIZHOU BYD BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]However, there are still certain problems with the current additives
For example, some compounds have too high LUMO and are not easy to decompose into films, or although they have low LUMO, their molecular stability is not too high, so there are certain problems in use and storage.

Method used

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  • Electrolyte additive, electrolyte containing additive and lithium battery using electrolyte
  • Electrolyte additive, electrolyte containing additive and lithium battery using electrolyte
  • Electrolyte additive, electrolyte containing additive and lithium battery using electrolyte

Examples

Experimental program
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preparation example Construction

[0053] A. Preparation of Intermediate II:

[0054] At a temperature of 0°C, the starting material amine I and pyridine sulfur trioxide react in the solvent acetonitrile in the presence of triethylamine to obtain intermediate II;

[0055] B. the preparation of the compound shown in formula (2):

[0056] At a temperature of -78°C, after intermediate II is mixed with trifluoromethanesulfonic anhydride and ligand triphenoxyphosphine, triethylamine and raw material alcohol are added to react in solvent dichloromethane to obtain the compound shown in formula (2). compound.

[0057] According to the present disclosure, relative to 2mol of the compound shown in formula (2), the amount of the compound shown in formula (3) can be varied within a wide range, and the amount of compound shown in formula (3) can be 1.1-1.5 mol, the amount of the reaction solvent can be 300-500mL; the reaction solvent can be an organic solvent known in the art, for example, the reaction solvent can be at l...

Embodiment 1

[0084] (1) Electrolyte preparation:

[0085] Cyclic carbonate (ethylene carbonate) and linear carbonate (diethyl carbonate) were mixed in a weight ratio of 3:7 in an argon glove box to obtain an organic solvent. The organic solvent was mixed with the electrolyte lithium salt (lithium hexafluorophosphate) so that the concentration of the lithium salt was 1.1 mol / L. Then mix with the electrolyte additive A1 that synthesis embodiment 1 obtains, with respect to the organic solvent (ethylene carbonate and diethyl carbonate) of 100 weight parts, the content of electrolyte lithium salt (lithium hexafluorophosphate) is 12 weight parts, electrolyte additive The content of A1 is 0.5 parts by weight. Stir until all solid substances are completely dissolved to obtain the lithium-ion battery electrolyte of this embodiment.

[0086] (2) Li-ion battery preparation:

[0087] NCM523 (LiNi 0.5 co 0.2 mn 0.3 o 2 ), acetylene black and polyvinylidene fluoride are mixed evenly according to ...

Embodiment 2

[0089] Lithium ion battery S2 was prepared by the method of Example 1. The difference is that in the electrolyte solution of this example, relative to 100 parts by weight of organic solvent (ethylene carbonate: diethyl carbonate = 3:7), the electrolyte lithium salt The content of (lithium hexafluorophosphate) was 12 parts by weight, and the content of the electrolyte solution additive A1 was 0.1 parts by weight.

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Abstract

The invention relates to an electrolyte additive, an electrolyte containing the additive and a lithium battery using the electrolyte. The electrolyte additive contains a sulfonate compound having a sulfonamide structure as shown in formula (1), in which R1 and R2 are each independently H, substituted or unsubstituted C1-C7 hydrocarbyl; R3 is a substituted or unsubstituted C1-C6 alkylene group; and R4 and R5 are each independently a substituted or unsubstituted C1-C6 alkyl group. The lithium battery additive disclosed by the invention contains the sulfonate compound with the sulfonamide structure, is relatively high in chemical stability and can be stored for a long time at room temperature; the lithium battery additive is relatively easy to decompose in the charge-discharge cycle process of non-aqueous electrolyte secondary energy storage equipment and forms an SEI membrane on the surface of a pole piece; and decomposition products contain a large amount of heteroatoms such as sulfur, nitrogen and oxygen, and lithium ions can pass through the SEI membrane more easily, so that the cycle performance of the lithium ion battery is improved.

Description

technical field [0001] The present disclosure relates to the field of lithium batteries, in particular to an electrolyte additive, an electrolyte containing the additive, and a lithium battery using the electrolyte. Background technique [0002] With the rapid development of the economic level, people are paying more and more attention to the environmental problems that may be brought about by the improvement of the economic level. In the past two or three centuries, fossil energy has pushed the entire human society forward rapidly, but the ensuing environmental problems have always surrounded human society, and there is a growing trend. Therefore, it is an urgent need to find new sustainable green energy. In recent years, secondary batteries represented by lithium-ion batteries have attracted more and more attention due to their substitution of fossil energy and their advantages of green cycle and sustainability. Among them, lithium-ion batteries are particularly attracti...

Claims

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Application Information

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IPC IPC(8): C07C303/38C07C311/48H01M10/0567H01M10/0525
CPCC07C303/38H01M10/0567H01M10/0525C07C311/48Y02E60/10
Inventor 鲁平乔飞燕潘仪
Owner HUIZHOU BYD BATTERY
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