A two-phase dispersion-distributed lithium-rich manganese-based positive electrode material, a preparation method thereof and a lithium ion battery

By optimizing sintering process parameters and XRD measurements, the uniformity and stability of the two-phase distribution of lithium-rich manganese-based cathode materials were achieved, thereby improving the electrochemical performance and cycle life of the battery.

CN119943932BActive Publication Date: 2026-06-26CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
Filing Date
2025-01-24
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing technologies struggle to effectively control the uniformity of the two-phase structure distribution and batch stability of the sintering process in lithium-rich manganese-based cathode materials, resulting in poor electrochemical performance.

Method used

The diffraction pattern of lithium-rich manganese-based cathode material was measured using an XRD instrument with Cu-Kα as the incident light source. By adjusting sintering process parameters such as atmosphere and micro-negative pressure conditions, the preparation method of lithium-rich manganese-based cathode material was optimized to ensure that the ratio of hexagonal phase to monoclinic phase grain size is within a specific range, thereby promoting the uniformity of the two phase distribution.

Benefits of technology

This achievement resulted in a more uniform two-phase distribution and a more ordered and stable layered structure in lithium-rich manganese-based cathode materials, improving specific capacity and cycle life, and solving the instability problem in mass production.

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Abstract

The application provides a two-phase dispersion distributed lithium-rich manganese-based positive electrode material and a preparation method thereof and a lithium ion battery, and relates to the technical field of battery positive electrode material preparation. In a diffraction spectrum obtained by using an XRD instrument with Cu-K alpha as an incident light source, the value range of A of the half-peak width ratio A of the LiMn6 peak with 2 theta located at 20.6+ / -0.1 degree and the (003) peak with 2 theta located at 18.6+ / -0.1 degree is 0.5<=A<=1.8. The application greatly improves the kinetics of the solid-phase sintering reaction of the lithium-rich manganese-based material by optimizing the sintering process of the lithium-rich manganese-based material, promotes the reaction to be more thorough, makes the two-phase distribution of the lithium-rich manganese-based material more uniform, the layered structure more ordered and stable, and the lithium-rich manganese-based material exhibit higher specific capacity and longer cycle life.
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