Long-circulation pre-magnesium silicon-oxygen negative electrode material and preparation method thereof

By adopting long-cycle premagnetization technology on silicon oxygen negative electrode materials, combined with carbon coating and surface modification, the problem of low efficiency of silicon oxygen negative electrode materials for the first time is solved, the circulation performance and safety of lithium-ion batteries are improved, and the production cost is reduced.

CN119725505AInactive Publication Date: 2025-03-28SHAANXI JINGTAI NEW ENERGY TECH CO LTD
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Patent Information

Application Number
CN202510239555.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-03
Publication Date
2025-03-28
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The first Coulomb efficiency of silicon oxygen negative electrode materials is low, resulting in poor circulation performance of lithium-ion batteries, and the existing prelithiation methods pose safety risks and high production costs.

Method used

Long-cycle pre-magnetized silicon oxygen negative electrode material is used, which is a core-shell structure and consists of a core-premagnetized silicon oxide material, an outer coated carbon material and a surface modified additive. The electrochemical performance of the material is improved through carbon coating and premagnetization technologies.

Benefits of technology

The first Coulomb efficiency of silicon oxygen negative electrode material is significantly improved, the lithium loss of lithium in the lithium-ion battery during the formation of SEI film is reduced, the cycle life of the battery is extended, and the production cost is reduced.

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Abstract

The invention discloses a long-circulation pre-magnesium silicon-oxygen negative electrode material and a preparation method thereof, and belongs to the technical field of nano materials and chemical power sources. Comprising the following steps: crushing the grain size of a common silica material; carrying out primary carbon coating on the crushed silica material; a pre-magnesium agent is added, and material pre-magnesium is conducted through solid-phase sintering; carrying out secondary carbon coating on the material subjected to the pre-magnesium treatment; the electrochemical performance is improved by adding a small amount of additive. According to the preparation method of the long-cycle pre-magnesium silicon-oxygen negative electrode material, the prepared silicon-oxygen negative electrode material is high in first coulombic efficiency, long in cycle life, low in cost, simple in preparation process and suitable for industrial large-scale production.
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