A decomposable organic lithium salt for an anode lithium supplementing agent and a preparation method thereof

By developing a composite of decomposable organic lithium salt and CMK-3 to generate an SEI rich in inorganic components, the problem of lithium-ion consumption in the first cycle of lithium-ion batteries has been solved, realizing a lithium-ion battery with high energy density and long life, suitable for consumer electronics, electric vehicles and energy storage.

CN116925002BActive Publication Date: 2026-05-29INST OF CHEM CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INST OF CHEM CHINESE ACAD OF SCI
Filing Date
2023-07-18
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing lithium-ion batteries consume lithium ions to form SEI during the first cycle, resulting in a decrease in battery energy density. Furthermore, common lithium replenishment agents have problems such as low theoretical capacity, high decomposition potential, and complex preparation processes, making it difficult to meet the requirements for high energy density and long lifespan.

Method used

A biodegradable organic lithium salt was developed. By releasing lithium ions during battery charging and generating an inorganic-rich SEI with the negative electrode, the theoretical capacity and decomposition voltage of the lithium salt can be controlled. CMK-3 is used as a conductive carbon material to composite with the organic lithium salt. The preparation process is simple and safe.

Benefits of technology

It improves the first-cycle coulombic efficiency of the battery, extends battery life, and has high theoretical capacity, low decomposition voltage, and good air stability, making it suitable for large-scale industrial production.

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Abstract

The present application relates to a kind of decomposable organic lithium salt for positive electrode lithium supplement agent and its preparation method.Compared with the currently commercialized positive electrode lithium supplement additive, the decomposable organic lithium salt of the present application has the advantages of high theoretical capacity, high air stability, simple preparation process, etc.The lithium salt is prepared by the reaction of a specific precursor and lithium source, and the theoretical capacity and decomposition potential of the lithium salt can be changed by changing the R group of the precursor, and an organic decomposable lithium salt lithium supplement agent is prepared by mixing with conductive carbon.The lithium supplement agent can be added to the positive electrode slurry during battery manufacturing process, and is compatible with the current battery manufacturing process.The lithium salt anion decomposes during charging and does not remain in the positive electrode, ensuring the energy density of the battery.The small molecules generated by decomposition form a solid electrolyte membrane (SEI) rich in inorganic components with the negative electrode, enhancing the mechanical strength of the SEI and prolonging the service life of the battery.
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Citation Information

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