Anti-overcharge electrolyte of lithium-ion power battery and lithium-ion power battery

A power battery and lithium-ion technology, applied in the field of lithium-ion battery electrolyte, can solve problems affecting the long cycle life of the battery, overcharge additives lose performance, increase battery internal resistance, etc., to improve room temperature cycle performance and high temperature performance, improve Internal dynamic characteristics, the effect of reducing the negative electrode interface impedance
CN108511802AInactive Publication Date: 2018-09-07DONGGUAN SHANSHAN BATTERY MATERIALS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DONGGUAN SHANSHAN BATTERY MATERIALS
Publication Date
2018-09-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of lithium ion battery electrolytes, and in particular relates to an anti-overcharge electrolyte of a lithium-ion power battery and a lithium-ion power battery, wherein the electrolyte comprises electrolyte lithium salt, a non-aqueous organic solvent, a film-forming additive and an anti-overcharge additive, wherein the film-forming additive is at leastone of tris (trimethylsilane) borate and ethylene sulfate; the anti-overcharge additive is provided with an aromatic compound with a structure (I) formula. The anti-overcharge additive disclosed by the invention does not participate in any reaction process when the battery is at a normal working voltage of (3.0-4.3V); when the charging voltage of the battery exceeds 4.45V, the anti-overcharge additive generates redox flying shuttle shunt voltage limitation on the surface of the electrode to clamp the voltage within a certain range, so as to prevent the internal electrolyte of the battery fromviolently decomposing to generate heat and gas due to excessively high voltage, and further to avoid the battery from the safety problems such as burning, explosion and the like.
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Description

Technical field

[0001] The invention belongs to the technical field of lithium-ion battery electrolytes, and in particular relates to a lithium-ion power battery anti-overcharge electrolyte and a lithium-ion power battery. Background technology

[0002] Lithium-ion batteries are widely used in 3C digital products, power tools, electric vehicles, energy storage equipment and other fields due to their high operating voltage, high energy density, long life and environmental friendliness.

[0003] As a means of transportation, the driving range, acceleration performance, climbing ability and safety performance of electric vehicles are the focus of attention, and the level of these performance indicators mainly depends on the power battery as a key component. In order to meet the higher power battery energy density requirements in the above plan, one is to continuously increase the nickel content in cathode materials, such as NCM622, NCM811, NCA, etc., and the other is to continu...

Claims

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