A mischphase lamellar cathode material, its preparation and use

By preparing a mixed-phase layered cathode material with alternating P and O phases and combining it with lithium doping, the problem of structural instability of single-phase layered cathode materials in sodium-ion batteries was solved, achieving high stability and excellent electrochemical performance.

CN116344753BActive Publication Date: 2026-07-24SHANGHAI UNIV +1
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Patent Information

Application Number
CN202111578622.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-12-22
Publication Date
2026-07-24
Estimated Expiration
2041-12-22

AI Technical Summary

Technical Problem

Existing single-phase layered cathode materials are structurally unstable during the charge and discharge process of sodium-ion batteries, resulting in poor electrochemical performance and failing to effectively solve the problems of interlayer slip and phase transition.

Method used

A mixed-phase layered cathode material with alternating P and O phases was prepared by co-precipitation. Through the synergistic effect between different crystal phases and lithium doping, a P2/O3 mixed-phase structure was formed, which improved the structural stability.

Benefits of technology

It effectively suppresses phase transitions during the charging and discharging process of sodium-ion batteries, improves the structural stability of layered cathode materials, and enhances capacity performance, rate performance, and cycle performance.

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Abstract

The application provides a mixed-phase layered positive electrode material, a preparation method and application thereof, the crystal structure of the mixed-phase layered positive electrode material comprises P-phase layers and O-phase layers which are stacked in sequence; the composition of the P-phase layer is sodium lithium cobalt manganese oxide, and the composition of the O-phase layer is lithium-rich lithium manganese oxide. The mixed-phase layered positive electrode material provided by the application, in which the P-phase and the O-phase are alternately stacked, effectively inhibits the phase change of the positive electrode material in the charging and discharging process of the sodium ion battery through the synergistic effect between different crystal phases, improves the structural stability of the layered positive electrode material, so that the sodium ion battery prepared has higher capacity performance, excellent rate performance and cycle performance. In addition, the mixed-phase layered positive electrode material provided by the application has a higher sodium content, which expands the possibility of practical application of the layered positive electrode material.
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