A multi-metal-doped sodium-ion battery positive electrode material, a preparation method and application thereof
By using multi-metal doped O3-type layered oxide cathode material, the capacity decay problem caused by phase transition during charging and discharging of O3-type sodium-ion batteries has been solved, achieving high capacity and long cycle life at high cutoff voltage, which is suitable for sodium-ion batteries.
CN122102227APending Publication Date: 2026-05-29SANYA SCI & EDUCATION INNOVATION PARK WUHAN UNIV OF TECH
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SANYA SCI & EDUCATION INNOVATION PARK WUHAN UNIV OF TECH
- Filing Date
- 2026-01-29
- Publication Date
- 2026-05-29
AI Technical Summary
Technical Problem
Existing O3-type sodium-ion battery cathode materials are prone to irreversible phase transitions during charge and discharge, leading to rapid capacity decay and poor cycle stability at higher cutoff voltages.
Method used
A multi-metal doped O3-type layered oxide cathode material was synthesized by solid-state sintering, resulting in the formation of a multi-metal synergistic effect and improving the phase transition process of the material under different cutoff voltages.
Benefits of technology
It exhibits high specific capacity, excellent rate performance, and long cycle life at cutoff voltages of 4.0V and 4.3V, significantly improving the electrochemical performance of the material.
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Abstract
This invention provides a multi-metal-doped sodium-ion battery cathode material, its preparation method, and its application, relating to the field of cathode materials. The method for preparing the multi-metal-doped sodium-ion battery cathode material of this invention, wherein the cathode material has the chemical formula NaLi, is described in this invention. x Ni y Fe 0.2 Mn z Ti n O2, x=0.05-0.15, y=0.25-0.35, z=0.25-0.35, n=0.05-0.15, x+y+z+n=0.8, includes the following steps: (1) the precursors of the above stoichiometric sodium source and transition metal source are mixed by ball milling wet grinding to obtain a uniformly mixed powder; (2) the uniformly mixed powder is subjected to high-temperature calcination in air atmosphere to form a target layered structure, thereby obtaining a multi-metal doped sodium-ion battery cathode material. The novel molar ratio O3-type layered cathode material provided by this invention has a multi-metal synergistic effect, which can effectively improve the phase transition process of the material during charging and discharging, so that it exhibits high specific capacity, excellent rate performance and long cycle life at different cutoff voltages (4.0 and 4.3V), and has a bright application prospect.
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