The invention belongs to the technical field of sodium-ion batteries, and particularly relates to a sodium-ion battery positive electrode material with a coating structure as well as a preparation method and application of the sodium-ion battery positive electrode material. The chemical general formula of the sodium ion positive electrode material with the coating structure is Na < 1 + a > Ni < x > Mn < y > Fe < z > A < m > B < n > O < 2 >, wherein-0.35 < = a < = 0.20, 0.08 < x < = 0.5, 0.05 < y < = 0.48, 0.03 < z < 0.4, 0.03 < m < 0.24, 0.001 < n < 0.06, and x + y + z + m + n = 1. The preparation method of the sodium ion battery positive electrode material comprises the following steps: firstly, uniformly mixing a sodium source, a nickel source, a manganese source, an iron source and an A source, and then carrying out first sintering, cooling and crushing to obtain a semi-finished product; and uniformly mixing the semi-finished product with a B source, sintering for the second time, cooling, and crushing to obtain the sodium ion positive electrode material. The sodium ion positive electrode material is stable in structure, the surface coating layer of the sodium ion positive electrode material inhibits side reaction between the sodium ion positive electrode material and electrolyte, and the cycle performance is remarkably improved.
本发明属于钠离子电池技术领域,具体涉及一种具有包覆结构的钠离子电池正极材料及其制法和应用。所述具有包覆结构的钠离子正极材料的化学通式为Na1+aNixMnyFezAmBnO2,其中:‑0.35≤a≤0.20,0.08<x≤0.5,0.05<y≤0.48,0.03<z<0.4,0.03<m<0.24,0.001<n<0.06,x+y+z+m+n=1。所述钠离子电池正极材料的制备方法,包括如下步骤:首先将钠源,镍源,锰源,铁源和A源混合均匀后,进行第一次烧结,冷却,粉碎,得到半成品;然后将半成品与B源混合均匀后,然后进行第二次烧结,冷却,粉碎,得到钠离子正极材料。本发明所述的钠离子正极材料结构稳定,其表面包覆层抑制了与电解液之间的副反应,循环性能得到显著提升。
Sodium-ion battery positive electrode material with coating structure as well as preparation method and application of sodium-ion battery positive electrode material
一种具有包覆结构的钠离子电池正极材料及其制法和应用
2022-12-30
Patent
Electronic Resource
Chinese
IPC: | H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen |
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