A spherical lithium oxalate@catalyst composite lithium supplement agent, its preparation method and application

The in-situ generation and composite of catalysts in lithium oxalate composite lithium supplements were achieved by a one-step spray drying method, which solved the problems of complex and high energy consumption in traditional processes and improved the electrochemical performance and processing performance of lithium-ion batteries.

CN122298418APending Publication Date: 2026-06-30SUZHOU HYCAN HLDG CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUZHOU HYCAN HLDG CO LTD
Filing Date
2026-05-27
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Traditional processes for preparing spherical lithium oxalate composite lithium supplements are complex, energy-intensive, result in uneven catalyst dispersion, high lithium oxalate decomposition potential, limited improvement in battery performance, and are difficult to control in morphology, making it difficult to achieve in-situ catalyst generation and composite.

Method used

A one-step spray drying method is adopted to directly mix and spray dry the metal salt precursor with lithium oxalate, simultaneously realizing the in-situ generation and composite of the catalyst. By utilizing the temperature control during the spray drying process, the conversion of the metal salt precursor and the in-situ composite of lithium oxalate are completed within the microdroplets, forming spherical composite particles.

Benefits of technology

It significantly simplifies the process flow, reduces energy consumption and cost, improves material uniformity and lithium replenishment efficiency, and the catalyst is highly uniformly dispersed in the lithium oxalate matrix, thereby improving the first charge efficiency and cycle stability of the battery and improving electrode processability.

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Abstract

This invention belongs to the field of lithium-ion battery technology, and discloses a spherical lithium oxalate@catalyst composite lithium replenisher, its preparation method, and its application. By carefully selecting metal salt precursors, the method utilizes the thermal effect of spray drying to achieve in-situ generation of highly active nanoscale catalysts, uniform composite with lithium oxalate, and spherical particle formation in one step. This completely eliminates the complex steps of catalyst pre-synthesis in traditional processes, resulting in a comprehensive energy consumption reduction of over 60%. This method has outstanding advantages such as extremely simple process, low cost, uniform composite, controllable morphology, and excellent performance. The prepared composite lithium replenisher consists of regular spherical particles with a spherical integrity rate of ≥94%. It reduces the decomposition potential of lithium oxalate to 3.68–3.95 V, enabling lithium-ion batteries to achieve an initial efficiency of ≥89.6% and a capacity retention rate after 100 cycles that is at least 15 percentage points higher than without the addition of a lithium replenisher. The process is simple, low-cost, and easily scalable.
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