Phosphorus-based bifunctional positive electrode lithium supplementing material and preparation and application thereof

CN122267149APending Publication Date: 2026-06-23SHANGHAI HUIZHI ADVANCED MATERIALS TECHNOLOGY CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI HUIZHI ADVANCED MATERIALS TECHNOLOGY CO LTD
Filing Date
2026-04-30
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

During the initial charge and discharge process of existing lithium-ion batteries, the high reactivity of the negative electrode material surface leads to the consumption of lithium ions and electrolyte components, forming an SEI film that consumes active lithium and reduces the initial capacity of the battery. Existing positive electrode lithium replenishment agents have problems such as low capacity and significant side reactions, making it difficult to meet the needs of high energy density batteries.

Method used

A phosphorus-based bifunctional positive electrode lithium supplement material is used, which is composed of elemental phosphorus, lithium fluoride and Ketjen black. LiPF6 and active lithium are generated by ball milling and composite, avoiding side reactions. It is suitable for high specific capacity negative electrode systems and can be used to prepare positive electrode sheets or lithium supplement separators.

Benefits of technology

It enables simultaneous replenishment of lithium source and electrolyte lithium salt, improves initial coulombic efficiency and cycle stability, avoids side reactions of traditional lithium replenishment agents, has good air stability and safety, and is suitable for a variety of cathode materials and separators, expanding application scenarios.

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Abstract

The present application relates to a kind of phosphorus-based bifunctional positive electrode lithium supplement material and its preparation and application, the positive electrode lithium supplement material includes the following weight percentage of raw material components: elemental phosphorus 10~50%, lithium fluoride 50~90%, ketchen black 1~10%.Compared with prior art, the phosphorus-based bifunctional positive electrode lithium supplement material provided in the present application can further prepare lithium supplement diaphragm and lithium supplement positive electrode and be used in lithium ion battery, which not only has higher theoretical capacity, can effectively compensate the irreversible capacity loss in the first cycle of battery, but also generates LiPF6 in situ under electrochemical conditions through the synergistic reaction of red phosphorus and lithium fluoride, realizes the synchronous supplement of active lithium and electrolyte lithium salt, improves battery initial coulomb efficiency and long-term cycle performance etc..
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