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Flame-retardant high-voltage electrolyte for lithium ion battery and preparation method of flame-retardant high-voltage electrolyte

A lithium-ion battery and electrolyte technology, which is applied in the field of flame-retardant high-voltage electrolyte for lithium-ion batteries and its preparation, can solve the problems of single function and non-flammability of electrolyte, achieve good compatibility and solve service life Anxiety, a wide range of effects

Inactive Publication Date: 2020-06-23
天津中电新能源研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent application number 201910646351.2 discloses a high-voltage electrolyte additive, a high-voltage electrolyte containing it, and a lithium-ion battery. A benzene-based high-voltage electrolyte additive is added to the conventional electrolyte, which can preferentially decompose the base solvent. Decomposition, forming a dense interfacial film on the surface of the electrode, which can inhibit the decomposition of the electrolyte and improve the cycle stability of the lithium-ion battery under high voltage (4.5V-4.8V) conditions, but the electrolyte provided by the invention does not have resistance flammability, and the function is relatively single

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  • Flame-retardant high-voltage electrolyte for lithium ion battery and preparation method of flame-retardant high-voltage electrolyte
  • Flame-retardant high-voltage electrolyte for lithium ion battery and preparation method of flame-retardant high-voltage electrolyte
  • Flame-retardant high-voltage electrolyte for lithium ion battery and preparation method of flame-retardant high-voltage electrolyte

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preparation example Construction

[0039] The preparation method of the flame-retardant high-voltage electrolyte for the lithium-ion battery comprises dissolving the lithium salt in a flame-retardant solvent, adding an additive after the lithium salt is completely dissolved, and forming the flame-retardant high-voltage electrolyte for the lithium-ion battery after uniform stirring;

[0040] Specific steps are as follows:

[0041] Step 1: Dissolve the lithium salt in the flame retardant solvent, the concentration of the lithium salt is 0.8-2mol / L, the volume of each component in the flame retardant solvent accounts for the total volume of the solution: carbonates account for 5%-50%, Fluorocarbonates account for 10%-60%, and fluoroethers account for 5%-80%. Stir to completely dissolve the lithium salt;

[0042] Step 2: Add additives to the solution formed in Step 1, the additives account for 0.1%-10% of the total volume or weight of the solution, and continue stirring for 10 hours to form a uniform flame-retardan...

Embodiment 1

[0045] Take a certain amount of lithium hexafluorophosphate (LiPF 6 ) dissolved in a flame retardant solvent, after stirring and dissolving LiPF 6 The molar concentration is 1mol / L. The solvent consists of fluoroethylene carbonate (FEC), dimethyl carbonate (DMC) and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (HFE), FEC accounts for 30% of the total volume of the solution, DMC accounts for 30% by volume, and HFE accounts for 40% by volume. After the lithium hexafluorophosphate is completely dissolved, add tris(2,2,2-trifluoroethyl)phosphite with a mass fraction of 1%, and continue stirring for 10 hours to obtain one of the flame-retardant high-voltage lithium battery electrolytes provided by the present invention.

Embodiment 2

[0047] Take a certain amount of lithium hexafluorophosphate (LiPF 6 ) dissolved in a flame retardant solvent, after stirring and dissolving LiPF 6 The molar concentration is 1.2mol / L. The solvent consists of fluoroethylene carbonate (FEC), ethyl methyl carbonate (EMC) and 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether (HFE), FEC accounts for 30% of the total volume of the solution, DMC accounted for 32% by volume, and HFE accounted for 38% by volume. After the lithium hexafluorophosphate is completely dissolved, vinylene carbonate with a volume fraction of 1% is added, and the stirring is continued for 10 hours to obtain one of the flame-retardant high-voltage lithium battery electrolytes provided by the present invention.

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Abstract

The invention relates to a flame-retardant high-voltage electrolyte for a lithium ion battery and a preparation method of the flame-retardant high-voltage electrolyte. The electrolyte is composed of alithium salt, a flame-retardant solvent and an additive, wherein the flame-retardant solvent is composed of carbonates, fluorocarbonates and fluoroethers; a fluorinated solvent is used as a main body, a conventional carbonate solvent and an additive are combined, and good wettability, incombustibility and relatively strong interface film-forming property of the fluorinated solvent and relativelyhigh lithium salt solubility of the conventional carbonate solvent are utilized, so that the electrolyte not only has good wettability and incombustibility, but also has relatively high ionic conductivity; the flame-retardant electrolyte can be applied to a lithium ion battery with metal lithium as a negative electrode, and can also be applied to a lithium ion battery with a graphite negative electrode; and the flame-retardant electrolyte can be applied to a conventional voltage lithium ion battery, can also be applied to a high-voltage lithium ion battery, and the electrode material is good in compatibility and wide in application range.

Description

technical field [0001] The invention belongs to the field of new energy lithium batteries, and in particular relates to a flame-retardant high-voltage electrolyte for lithium-ion batteries and a preparation method thereof. Background technique [0002] Compared with traditional nickel-metal hydride batteries, lead-acid batteries, alkaline manganese dioxide batteries, etc., lithium batteries have the advantages of high working voltage, long cycle life, high energy density, and no memory effect. They are now widely used in portable computers , mobile communications and other small 3C digital products and large vehicles such as electric bicycles and electric vehicles, and present a growing application market. According to my country's future development plan, green and environmentally friendly electric vehicles will gradually replace traditional fuel vehicles, so lithium batteries for vehicle power have broad market and application prospects. However, at present, conventional ...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/0569H01M10/4235H01M2300/0028Y02E60/10
Inventor 王磊桑林刘兴江丁飞
Owner 天津中电新能源研究院有限公司
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