阴极
材料科学
空位缺陷
电化学
钠离子电池
八面体
氧化物
过渡金属
相变
离子
兴奋剂
纳米技术
扩散
相(物质)
结构稳定性
化学工程
电池(电)
光电子学
化学
电极
催化作用
冶金
结晶学
物理化学
热力学
功率(物理)
法拉第效率
有机化学
工程类
物理
结构工程
生物化学
作者
Longjiao Chang,Ruifen Yang,Xiaolong Bi,Wei Yang,Kedi Cai,Anlu Wei,Jianan Liu
标识
DOI:10.1016/j.est.2023.109025
摘要
P2 layered oxide cathode materials for sodium ion batteries are favored by many scholars because of their advantages such as high energy density, abundant type, simple synthesis way and low environmental pollution. Among them, the most representative material is P2-Na2/3Ni1/3Mn2/3O2 (P2-NaNMO). However, the following issues can potentially affect how the material is used in practice: The Na+/vacancy ordering increases the diffusion barrier of Na+, which has a significant impact on the electrochemical performance; Mn3+ induces Jahn-Teller distortion, which disrupts the structural stability of the oxygen octahedron, resulting in structural degradation and decreased performance; an unexpected P2-O2 phase transition will occur when the cut-off voltage is >4.2 V. Therefore, the preparation of P2-NaNMO with high stability under high operating voltage has become the primary problem at present. Firstly, the research progress of layered transition metal oxides is introduced. Secondly, the structure and advantages of P2-NaNMO materials are analyzed. At the same time, in order to inhibit the phase transition of P2-NaNMO during the charging and discharging process, the modification method of the material was proposed. Finally, the influences of doping elements at various positions, surface modification, different binders on the performances of P2-NaNMO are systematically discussed, and their future development is prospected.
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