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An electrolyte and anti-overcharge technology, applied in the field of battery electrolyte
Inactive Publication Date: 2014-12-17
YICHUN JINHUI NEW ENERGY MATERIALS
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Problems solved by technology
[0007] At present, there are no N-P flame retardants and their compounds in the market, which are used in lithium batteries and their electrolytes.
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Embodiment 1
[0031] The electrolytic solution of the present invention is prepared according to the same method of Comparative Example 1, the difference is the functional additive added to the electrolytic solution on this basis, that is, adding 1% p-terphenyl according to the total mass of the electrolytic solution Hydrogenated terphenyl Hexa-(4-phenylphenoxy)cyclotrimeric phosphazene Hexa-(4fluoro-3fluoromethylphenoxy)cyclotrimeric phosphazene The electrolyte solution of the present invention is obtained. That is to say, the amounts of the above-mentioned components added to the electrolyte account for 1% of the total mass of the electrolyte. The following embodiments are all the same as this example except for the place described.
Embodiment 2
[0033] Prepare electrolyte according to the same method of comparative example 1, the difference is to add on this basis, in this electrolyte, add each 1% p-terphenyl, hydrogenated terphenyl, hexa-(4 -phenylphenoxy) cyclotrimeric phosphazene to obtain the electrolyte solution of the present invention.
Embodiment 3
[0035] Prepare the electrolyte according to the same method as in Comparative Example 1, the difference is that it is added to the electrolytic solution on this basis, and 1% of p-terphenyl and hydrogenated terphenyl are added according to the total mass of the electrolyte to obtain the electrolyte of the present invention .
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Abstract
The invention provides over-charging prevention flame-retardant battery electrolyte which comprises a non-aqueous organic solvent, lithium salt, a film formation and over-charging prevention additive and a functional additive, wherein the functional additive has the following molecular formula described in the specification; in the molecular formula, each of R1-R6 can be one or more independently selected from hydrogen, halogen, alkyl, alkoxy, halogenated alkyl, halogenated alkoxy, alkylene, halogenated alkylene, phenyl, halogenated phenyl, xenyl, halogenated xenyl, halogenated triphenyl, ester group and cyano-group, and the halogen is selected from fluorine or chlorine. In a formula of the battery electrolyte, the function additive is fed into the electrolyte and is taken as the component of a solid electrolyte interface (SEI) diaphragm layer, so that the over-charging prevention performance of the electrolyte is improved, the flame retardant property of the electrolyte is improved, and the safety problem of a lithium battery is further solved. Furthermore, the high and low temperature performance and the cycle performance of the battery are not influenced, so that the battery electrolyte has the good over-charging prevention performance and a flame-retardant function.
Description
Technical field: [0001] The invention relates to a battery electrolyte, in particular to an overcharge-proof and flame-retardant battery electrolyte. Background technique: [0002] With the rapid development of portable electronic devices, hybrid vehicles, electric vehicles, and space technology, secondary batteries have put forward higher requirements in terms of capacity, cycle life, and safety. However, due to the lively performance of the internal materials of the lithium-ion battery, when the battery is overcharged, metal lithium crystals are easily precipitated on the surface of the carbon electrode, causing short circuits, thermal runaway, etc., thus causing great safety hazards to the battery, especially the power battery. Improving the safety performance of batteries is one of the focuses of lithium battery research. Anti-overcharge biphenyl and cyclohexylbenzene compounds have been used as conventional additives for lithium-ion battery electrolytes. However, biph...
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Application Information
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