High capacity sodium-rich layered oxide cathode for sodium-ion batteries
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  • 英文篇名:High capacity sodium-rich layered oxide cathode for sodium-ion batteries
  • 作者:郭根材 ; 王长昊 ; 明帮铭 ; 罗斯玮 ; 苏恒 ; 王博亚 ; 张铭 ; 尉海军 ; 王如志
  • 英文作者:Gen-Cai Guo;Changhao Wang;Bang-Ming Ming;Si-Wei Luo;Heng Su;Bo-Ya Wang;Ming Zhang;Hai-Jun Yu;Ru-Zhi Wang;College of Materials Science and Engineering, Beijing University of Technology;
  • 英文关键词:sodium-rich layered oxides;;first-principles calculations;;sodium-ion diffusion
  • 中文刊名:ZGWL
  • 英文刊名:中国物理B
  • 机构:College of Materials Science and Engineering, Beijing University of Technology;
  • 出版日期:2018-11-15
  • 出版单位:Chinese Physics B
  • 年:2018
  • 期:v.27
  • 基金:Project suppoted by the National Natural Science Foundation of China(Grant Nos.11774017,51761135129,and 51472010);; Beijing Municipal High Level Innovative Team Building Program,China(Grant No.IDHT20170502)
  • 语种:英文;
  • 页:ZGWL201811084
  • 页数:7
  • CN:11
  • ISSN:11-5639/O4
  • 分类号:669-675
摘要
Sodium-ion batteries have attracted significant recent attention currently considering the limited available lithium resource. However, the energy density of sodium-ion batteries is still insufficient compared to lithium-ion batteries, mainly because of the unavailability of high-energy cathode materials. In this work, a novel sodium-rich layered oxide material(Na_2 MnO_3) is reported with a dynamical stability similar to that of the Li_2 MnO_3 structure and a high capacity of269.69 mA·h·g1, based on first-principles calculations. Sodium ion de-intercalation and anionic reaction processes are systematically investigated, in association with sodium ions migration phenomenon and structure stability during cycling of Nax MnO3(1 ≤ x ≤ 2). In addition, the charge compensation during the initial charging process is mainly contributed by oxygen, where the small differences of the energy barriers of the paths 2 c→4 h, 4 h→2 c, 4 h→4 h, 2 c→2 b, and 4 h→2 b indicate the reversible sodium ion occupancy in transitional metal and sodium layers. Moreover, the slow decrease of the elastic constants is a clear indication of the high cycle stability. These results provide a framework to exploit the potential of sodium-rich layered oxide, which may facilitate the development of high-performance electrode materials for sodium-ion batteries.
        Sodium-ion batteries have attracted significant recent attention currently considering the limited available lithium resource. However, the energy density of sodium-ion batteries is still insufficient compared to lithium-ion batteries, mainly because of the unavailability of high-energy cathode materials. In this work, a novel sodium-rich layered oxide material(Na_2 MnO_3) is reported with a dynamical stability similar to that of the Li_2 MnO_3 structure and a high capacity of269.69 mA·h·g1, based on first-principles calculations. Sodium ion de-intercalation and anionic reaction processes are systematically investigated, in association with sodium ions migration phenomenon and structure stability during cycling of Nax MnO3(1 ≤ x ≤ 2). In addition, the charge compensation during the initial charging process is mainly contributed by oxygen, where the small differences of the energy barriers of the paths 2 c→4 h, 4 h→2 c, 4 h→4 h, 2 c→2 b, and 4 h→2 b indicate the reversible sodium ion occupancy in transitional metal and sodium layers. Moreover, the slow decrease of the elastic constants is a clear indication of the high cycle stability. These results provide a framework to exploit the potential of sodium-rich layered oxide, which may facilitate the development of high-performance electrode materials for sodium-ion batteries.
引文
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