Lithium supplement material and preparation method thereof, positive pole piece and lithium ion battery

By using transition metal lithium-containing lithium-enhancing materials coated with carbon cladding in lithium-ion batteries, the problem of low charging and discharging efficiency for the first time in lithium-ion batteries is solved, and the effect of effectively decomposing and releasing lithium ions at a lower voltage is achieved, and the energy density of the battery is improved.

CN119695153APending Publication Date: 2025-03-25HUIZHOU TOPBAND ELECTRICAL TECH CO LTD
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Patent Information

Application Number
CN202411716470.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-27
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

Existing lithium-ion batteries are low in efficiency during the first charging and discharging, and the high charging voltage platform leads to instability of the positive electrode material, oxidation and decomposition of the electrolyte, and local overcharging of the negative electrode, making it difficult to effectively utilize lithium supplement agents.

Method used

A lithium supplement material is used, which includes a core and a carbon cladding layer covering the surface of the core part, the core contains transition metal elements and lithium-containing compounds, and the carbon cladding layer has holes. The material is prepared by mixing and reacting molten metal lithium with a transition metal compound composite material under an inert atmosphere.

Benefits of technology

The decomposition voltage of lithium supplement material is reduced, so that it can effectively decompose and release lithium ions at a lower voltage, optimize the formation of SEI film, and improve the first charge and discharge efficiency and mass energy density of lithium-ion batteries.

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Abstract

The invention provides a lithium supplement material and a preparation method thereof, a positive pole piece and a lithium ion battery, and belongs to the technical field of batteries. The lithium supplementing material comprises an inner core and a carbon coating layer coating at least part of the surface of the inner core, the inner core comprises a lithium supplementing agent, and the lithium supplementing agent comprises a transition metal element and a lithium-containing compound; and the carbon coating layer is provided with holes. The lithium supplementing material disclosed by the invention has relatively low decomposition voltage, lithium ions of the positive electrode material can be separated and participate in formation of an SEI (Solid Electrolyte Interface) film during first-time charging, and the consumption of the lithium ions of the positive electrode material in the process of participating in formation of the SEI film is reduced, so that the first-time charging and discharging efficiency of the battery is improved; in addition, the positive electrode can provide more lithium ions to participate in electrochemical reaction, so that the mass energy density of the battery can be improved.
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