A kind of anti-lithium battery overcharging functional electrolyte and production method thereof

Abstract

The invention provides functional electrolyte for preventing the overcharge of a lithium battery and a production method of the functional electrolyte. The functional electrolyte comprises basic electrolyte and a functional additive, wherein the basic electrolyte comprises a carbonic ester type mixed solvent, lithium hexafluorophosphate and vinylene carbonate; the carbonic ester type mixed solvent comprises ethylene carbonate, ethyl methyl carbonate and propylene carbonate; the functional additive comprises 2, 3, 4-trifluorobiphenyl and 1, 3-propene sulfonic acid lactone. The production method comprises the following steps: adding the ethylene carbonate, the ethyl methyl carbonate and the propylene carbonate into a clean container in sequence; reducing the temperature to room temperature, and then adding the lithium hexafluorophosphate; standing for clarification, and then adding the vinylene carbonate, the 1, 3-propene sulfonic acid lactone and the 2, 3, 4-trifluorobiphenyl; and standing for clarification for spare use. The functional electrolyte provided by the invention has the advantages that the occurrence of the safety problems such as ignition and explosion caused by the overcharge of the lithium battery can be effectively prevented, so that the safety of the battery is improved, the high-temperature circulating performance of the lithium battery is improved, and the functional electrolyte is strong in applicability and can be used in multiple electro-chemical systems.

Description

technical field [0001] The invention relates to the technical field of lithium battery electrolytes, in particular to a functional electrolyte for preventing overcharge of lithium batteries and a production method thereof. Background technique [0002] Lithium batteries refer to batteries containing lithium in the electrochemical system. Since the birth of rechargeable lithium metal batteries in the 1990s, due to their superior safety, specific capacity, self-discharge rate and cost performance, they have been widely used in notebook computers, Mobile phones, digital cameras, mp3 players and other small electronic equipment and medical equipment, as a driving power supply. [0003] A lithium battery includes a positive electrode, a negative electrode, an electrolyte, and a separator. Lithium ions undergo oxidation and reduction reactions on the positive and negative electrodes to trigger electron intercalation and extraction to generate electrical energy. If the lithium bat...

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Problems solved by technology

However, the film's relatively low conductivity to lithium ions can lead to a significant decrease in the battery's sequential performance and storage life.

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