Electrolyte for high-rate lithium battery and preparation method of electrolyte

By combining a specific proportion of electrolyte, the problem of low charging and discharging efficiency of high-rate lithium batteries is solved, the production efficiency and equipment utilization rate are improved, and the production cost is reduced.

CN119725739APending Publication Date: 2025-03-28ZHONGSHAN SHIBAO NEW ENERGY
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Patent Information

Application Number
CN202411871460.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-18
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

After the existing high-rate lithium batteries are discharged to the lower limit cutoff voltage, the charging and discharging efficiency is low, resulting in increased terminal weight, large space occupation, high manufacturing cost, and low production efficiency and equipment utilization.

Method used

An electrolyte for a high-rate lithium battery composed of a solvent, a mixed lithium salt and an additive is used. The solvent ratio is between 80% and 85%, the lithium salt ratio is between 10% and 15%, and the additive ratio is between 5% and 8%. The mixed lithium salt is composed of lithium hexafluorophosphate and lithium difluorosulfonimide, and the additive contains fluoride ether.

Benefits of technology

It improves the charging and discharging efficiency of high-rate lithium batteries, shortens the electrolyte infiltration time, improves production efficiency and equipment utilization, and reduces production costs.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly discloses an electrolyte for a high-rate lithium battery, the electrolyte is compounded by a solvent, a mixed lithium salt and an additive according to the mass percent of (80%-85%): (10%-15%): (5%-8%), the mixed lithium salt contains at least two lithium salts, the additive contains fluorinated ether, and the fluorinated ether contains at least one of the lithium salts. And the content of the fluorinated ether is 0.3%-0.5% of the total weight of the electrolyte. When the electrolyte is applied to the high-rate lithium battery, the charging and discharging efficiency of the high-rate lithium battery can be improved; the infiltration time of the electrolyte in the high-rate lithium battery is shortened, and the production efficiency of the high-rate lithium battery and the utilization rate of a production site are improved; in the formation (activation) process of the high-rate lithium battery, the formation current can be improved, the formation time can be shortened, the lithium battery manufacturing efficiency and the equipment utilization rate can be improved, and the production cost can be reduced; the invention also provides a preparation method of the electrolyte for the high-rate lithium battery, and the preparation method is simple and suitable for large-scale production and application.
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