SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (8): 2214-2220.DOI: 10.1016/j.cjche.2020.05.015

• Materials and Product Engineering • 上一篇    下一篇

Mixed phase sodium manganese oxide as cathode for enhanced aqueous zinc-ion storage

Xinyu Wang1, Xinghua Qin1, Qiongqiong Lu2, Mingming Han3, Ahmad Omar2, Daria Mikhailova2   

  1. 1 Institute of Materials and Technology, Dalian Maritime University, Dalian 116026, China;
    2 Leibniz Institute for Solid State and Materials Research(IFW) Dresden e. V., Helmholtzstraße 20, 01069 Dresden, Germany;
    3 School of Materials Science and Engineering, Central South University, Changsha 410083, China
  • 收稿日期:2020-04-06 修回日期:2020-05-09 出版日期:2020-08-28 发布日期:2020-09-19
  • 通讯作者: Xinyu Wang, Qiongqiong Lu
  • 基金资助:
    Q.L. acknowledges the financial support from the China Scholarship Council (CSC). This work was supported by the National Natural Science Foundation of China (21905037) and the Fundamental Research Funds for the Central Universities (3132019328, 3132020151).

Mixed phase sodium manganese oxide as cathode for enhanced aqueous zinc-ion storage

Xinyu Wang1, Xinghua Qin1, Qiongqiong Lu2, Mingming Han3, Ahmad Omar2, Daria Mikhailova2   

  1. 1 Institute of Materials and Technology, Dalian Maritime University, Dalian 116026, China;
    2 Leibniz Institute for Solid State and Materials Research(IFW) Dresden e. V., Helmholtzstraße 20, 01069 Dresden, Germany;
    3 School of Materials Science and Engineering, Central South University, Changsha 410083, China
  • Received:2020-04-06 Revised:2020-05-09 Online:2020-08-28 Published:2020-09-19
  • Contact: Xinyu Wang, Qiongqiong Lu
  • Supported by:
    Q.L. acknowledges the financial support from the China Scholarship Council (CSC). This work was supported by the National Natural Science Foundation of China (21905037) and the Fundamental Research Funds for the Central Universities (3132019328, 3132020151).

摘要: Aqueous zinc-ion batteries have been regarded as a promising alternative to large-scale energy storage, due to associated low-cost, improved safety and environmental friendliness. However, a high-performance cathode material for both rate capability and specific capacity is still a challenge. One kind of the more promising candidates are sodium manganese oxide (NMO) materials, although they suffer from individual issues and need to be further improved. Herein, we present a novel mixed phase NMO material composed of nearly equal amounts of Na0.55Mn2O4 and Na0.7MnO2.05. The structured configuration with particle size of 200-500 nm is found to be beneficial towards improving the ion diffusion rate during the charge/discharge process. Compared with Na0.7MnO2.05 and Na0.55Mn2O4, the mixed phase NMO demonstrates an enhanced rate capability and excellent long-term cycling stability with a capacity retention of 83% after 800 cycles. More importantly, the system also delivers an impressive energy density and power density, as 378 W·h·kg-1 at 68.7 W·kg-1, or 172 W·h·kg-1 at 1705 W·kg-1. The superior electrochemical performance is ascribed to the fast Zn2+ diffusion rate because of a large ratio of capacitive contribution (63.9% at 0.9 mV·s-1). Thus, the mixed phase route provides a novel strategy to enhance electrochemical performance, enabling mixed phase NMO as very promising material towards large-scale energy-storage applications.

关键词: Aqueous zinc-ion battery, Sodium manganese oxide, Mixed phase, High energy density

Abstract: Aqueous zinc-ion batteries have been regarded as a promising alternative to large-scale energy storage, due to associated low-cost, improved safety and environmental friendliness. However, a high-performance cathode material for both rate capability and specific capacity is still a challenge. One kind of the more promising candidates are sodium manganese oxide (NMO) materials, although they suffer from individual issues and need to be further improved. Herein, we present a novel mixed phase NMO material composed of nearly equal amounts of Na0.55Mn2O4 and Na0.7MnO2.05. The structured configuration with particle size of 200-500 nm is found to be beneficial towards improving the ion diffusion rate during the charge/discharge process. Compared with Na0.7MnO2.05 and Na0.55Mn2O4, the mixed phase NMO demonstrates an enhanced rate capability and excellent long-term cycling stability with a capacity retention of 83% after 800 cycles. More importantly, the system also delivers an impressive energy density and power density, as 378 W·h·kg-1 at 68.7 W·kg-1, or 172 W·h·kg-1 at 1705 W·kg-1. The superior electrochemical performance is ascribed to the fast Zn2+ diffusion rate because of a large ratio of capacitive contribution (63.9% at 0.9 mV·s-1). Thus, the mixed phase route provides a novel strategy to enhance electrochemical performance, enabling mixed phase NMO as very promising material towards large-scale energy-storage applications.

Key words: Aqueous zinc-ion battery, Sodium manganese oxide, Mixed phase, High energy density