Sodium electric positive electrode material, positive electrode sheet and preparation method and application thereof
By coating the surface of the O3 phase layered sodium electrode material with a self-assembled heterojunction solid electrolyte, the problems of material air stability and residual alkali were solved, the cycle performance and ionic conductivity of the battery were improved, and the preparation process was simplified.
CN118198316BActive Publication Date: 2026-06-09GUANGDONG BRUNP RECYCLING TECH CO LTD +1
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUANGDONG BRUNP RECYCLING TECH CO LTD
- Filing Date
- 2024-03-22
- Publication Date
- 2026-06-09
AI Technical Summary
Technical Problem
O3-type sodium ion layered cathode materials suffer from poor air stability and high residual alkali, leading to reduced battery life and safety, which existing coating and acid washing methods cannot effectively solve.
Method used
A self-assembled heterojunction solid electrolyte is coated onto the surface of the O3 phase layered material. A stable coating layer is formed through a single sintering process, which reduces residual alkali and improves ionic conductivity.
Benefits of technology
It effectively reduces the residual alkali content on the material surface, improves cycle performance and ionic conductivity, enhances coating bonding strength, and reduces manufacturing costs.
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Smart Images
Figure CN118198316B_ABST
Abstract
This application relates to the field of battery materials technology, disclosing a sodium-ion battery cathode material, a cathode sheet, its preparation method, and its application. The sodium-ion battery cathode material comprises an O3 phase layered material substrate and a self-assembled heterojunction solid electrolyte coated on the surface of the O3 phase layered material substrate; the mass ratio of the self-assembled heterojunction solid electrolyte to the O3 phase layered material substrate is 1–10:100; A is one or more of Ni, Fe, and Mn; M is one or more of Cu, Zn, and Mg; Q is one or two of Ti and Zr; and T is one or two of P and S. The preparation method of the above-mentioned sodium-ion battery cathode material includes sintering a mixture containing various elements. The sodium-ion battery cathode material provided by this application does not readily absorb water from the air and has a low surface residual alkali content.
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