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Improving the Performance of Layered Oxide Cathode Materials with Football‐Like Hierarchical Structure for Na‐Ion Batteries by Incorporating Mg2+ into Vacancies in Na‐Ion Layers
ChemSusChem ( IF 8.4 ) Pub Date : 2018-03-06 , DOI: 10.1002/cssc.201702322
Zheng-Yao Li 1 , Huibo Wang 2 , Dongfeng Chen 1 , Kai Sun 1 , Wenyun Yang 3 , Jinbo Yang 3 , Xiangfeng Liu 2 , Songbai Han 1
Affiliation  

The development of advanced cathode materials is still a great interest for sodium‐ion batteries. The feasible commercialization of sodium‐ion batteries relies on the design and exploitation of suitable electrode materials. This study offers a new insight into material design to exploit high‐performance P2‐type cathode materials for sodium‐ion batteries. The incorporation of Mg2+ into intrinsic Na+ vacancies in Na‐ion layers can lead to a high‐performance P2‐type cathode material for sodium‐ion batteries. The materials prepared by the coprecipitation approach show a well‐defined morphology of secondary football‐like hierarchical structures. Neutron power diffraction and refinement results demonstrate that the incorporation of Mg2+ into intrinsic vacancies can enlarge the space for Na‐ion diffusion, which can increase the d‐spacing of the (0 0 2) peak and the size of slabs but reduce the chemical bond length to result in an enhanced rate capability and cycling stability. The incorporation of Mg2+ into available vacancies and a unique morphology make Na0.7Mg0.05Mn0.8Ni0.1Co0.1O2 a promising cathode, which can be charged and discharged at an ultra‐high current density of 2000 mA g−1 with an excellent specific capacity of 60 mAh g−1. This work provides a new insight into the design of electrode materials for sodium‐ion batteries.

中文翻译:

通过将Mg2 +掺入钠离子层的空位中,以类似于橄榄球的分层结构的钠离子电池层状氧化物正极材料,提高其性能。

先进的正极材料的开发仍然是钠离子电池的巨大兴趣。钠离子电池的可行商业化取决于合适电极材料的设计和开发。这项研究为材料设计提供了新的见解,以开发用于钠离子电池的高性能P2型阴极材料。在Na离子层中将Mg 2+掺入固有的Na +空位中可以产生用于钠离子电池的高性能P2型阴极材料。通过共沉淀法制备的材料显示出足球类二级结构的明确定义的形态。中子功率衍射和细化结果表明,Mg 2+的掺入进入固有空位可以扩大Na离子扩散的空间,这可以增加(0 0 2)峰的d间隔和平板的大小,但可以减少化学键的长度,从而提高倍率能力和循环稳定性。镁的掺入2+成可用的空位和独特的形态化妆的Na 0.7 Mg的0.05的Mn 0.80.10.1 ø 2有希望的阴极,它可以被充电和放电以2000毫安g的超高电流密度-1与60 mAh g -1的出色比容量。这项工作为钠离子电池的电极材料设计提供了新的见识。
更新日期:2018-03-06
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