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Non-aqueous electrolyte and battery containing non-aqueous electrolyte

A non-aqueous electrolyte, content technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as battery capacity diving, film erosion, damage, etc., to improve battery life, reduce side reactions, and reduce deterioration. Effect

Active Publication Date: 2019-11-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are certain problems in choosing a new solvent to replace the existing solvent system, such as low conductivity or high viscosity.
The improvement of the application of additives is also a good compromise. At present, most of the additives are based on increasing the oxidative decomposition potential of the entire electrolyte system. Therefore, there may be a small amount of solvent in the electrolyte that will still be oxidatively decomposed under high potential, resulting in The electrolyte is eventually exhausted, resulting in a capacity dive during the battery cycle.
The positive film-forming additive also has such shortcomings, and the film layer will be damaged by the erosion of the electrolyte due to contact with the electrolyte.

Method used

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  • Non-aqueous electrolyte and battery containing non-aqueous electrolyte
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preparation example Construction

[0041] The preparation method of the battery non-aqueous electrolyte provided by the present invention is a method routinely used by those skilled in the art, that is, to mix the components (including lithium salt, non-aqueous solvent and additives) uniformly, and the mixing method and sequence Inventions are not particularly limited. For example, the organic solvent is now mixed evenly, then the lithium salt is added and mixed evenly, and then the electrolyte additive is added and mixed evenly. The auxiliary additive can be added together with the electrolyte additive.

[0042] The invention also provides a battery, which comprises a battery casing, an electric core and a non-aqueous electrolyte sealed in the battery casing.

[0043] Wherein, the non-aqueous electrolyte is the above-mentioned non-aqueous electrolyte, and the cell includes a positive electrode, a negative electrode and a diaphragm. Since the present invention only involves the improvement of the non-aqueous e...

Embodiment 1-6

[0054] (1) Preparation of non-aqueous electrolyte:

[0055] Configure electrolyte in the glove box, control the oxygen content<2ppm in the glove box, be full of nitrogen in the glove box and control the purity of nitrogen in the glove box to be 99.999%, ethylene carbonate, diethyl carbonate, ethyl methyl carbonate After mixing evenly according to the mass ratio of 30:30:40, a non-aqueous solvent was obtained, and then fully dried lithium hexafluorophosphate was added to the above-mentioned non-aqueous solvent to configure a basic electrolyte with a liPF6 concentration of 1mol / L.

[0056] As shown in Table 1, add the additive described in the application and the auxiliary additive VC in the basic electrolyte, wherein, the addition amount of VC is 1.5% of the quality of the non-aqueous electrolyte, and the content of the additive described in Table 1 is Based on the total mass of the non-aqueous electrolyte, the battery non-aqueous electrolytes corresponding to the embodiments w...

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Abstract

The invention discloses a non-aqueous electrolyte and a battery containing the non-aqueous electrolyte. The non-aqueous electrolyte comprises lithium salt, an organic solvent and a heterocycle-containing silane additive. The additive added in the non-aqueous electrolyte can be electrolytically polymerized near a positive electrode, the formed polymer adheres to the surface of the positive electrode to form an interface film to protect the positive electrode material, the chain silane molecules partially form a monomolecular film layer existing on the surface of the interface film layer, whichcan be used as a protection layer for the interface film, the contact between electrolyte solvent molecules and the interface film layer can be effectively blocked, the occurrence of side reactions isreduced, the deterioration of the electrolyte is further reduced, and the battery life is enhanced.

Description

technical field [0001] The invention relates to the field of non-aqueous electrolytic solutions, in particular to a non-aqueous electrolytic solution and a battery containing the non-aqueous electrolytic solution. Background technique [0002] Lithium-ion batteries have advantages such as high energy density, high open circuit voltage, no memory effect, and low self-discharge, and are widely used in consumer electronics, military products, and aviation products. At present, the materials of lithium-ion batteries mainly include lithium manganese oxide, lithium cobalt oxide, ternary materials, lithium iron phosphate, etc., and the charging cut-off voltage generally does not exceed 4.2V. In recent years, with the expansion of the application of lithium-ion batteries, high-energy-density lithium-ion batteries have become the object of attention, and high-voltage (5V) cathode materials are one of the more popular research directions, mainly by improving the performance of cathode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M10/4235Y02P70/50
Inventor 乔飞燕潘仪
Owner BYD CO LTD