Manganese-rich precursor, preparation method thereof and cathode material

By controlling the oxidation atmosphere during the co-precipitation process to form high-valence manganese particles, and combining nanoscale particles with layered structures, the electrochemical kinetics and structural stability issues of lithium-rich manganese-based cathode materials were solved, thereby improving the electrochemical performance and cycle life of the battery.

CN121735324BActive Publication Date: 2026-07-21YOUYAN NEW ENERGY MATERIALS (JIANGXI) CO LTD
2 Cites 0 Cited by

Patent Information

Application Number
CN202512056031.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-12-31
Publication Date
2026-07-21
Estimated Expiration
2045-12-31

AI Technical Summary

Technical Problem

Lithium-rich manganese-based cathode materials exhibit significant capacity decay and voltage drop during cycling, mainly due to poor electrochemical kinetics and structural instability, particularly manganese ion dissolution and phase transition.

Method used

By controlling the oxidation atmosphere during the co-precipitation process, the ·OH free radicals generated by hydrogen peroxide in an alkaline environment oxidize Mn2+ to a higher valence state (Mn3+/Mn4+), forming nano-sized high-valence manganese oxide or hydroxide particles. These particles, combined with the interweaving of nano-sized ellipsoidal particles and lamellar structures, form a dense microstructure, improving tap density and surface stability.

Benefits of technology

It significantly improves lithium-ion transport performance, enhances electrochemical kinetics and structural stability, and increases the rate performance and cycle life of the material.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The application discloses a kind of manganese-rich precursors and preparation method and positive electrode material thereof, and is related to lithium ion battery material technical field.The preparation method includes that metal salt solution, precipitant and complexing agent are simultaneously added to reaction kettle by metering pump and carry out coprecipitation reaction, and hydrogen peroxide solution is pumped into reaction system by metering pump in stages during reaction process and carries out liquid phase micro-oxidation treatment.The prepared precursor is spherical secondary particle, and is composed of nanoscale particle and interwoven sheet-shaped primary particle.The method utilizes the direct and uniform oxidation effect of hydrogen peroxide in liquid phase, and in-situ constructs stable high-valence manganese oxide on the surface of precursor, so that the prepared positive electrode material simultaneously has excellent electrochemical kinetics and structural stability.
Need to check novelty before this filing date? Find Prior Art