Acta Chimica Sinica ›› 2021, Vol. 79 ›› Issue (10): 1232-1243.DOI: 10.6023/A21060260 Previous Articles     Next Articles



谢佶晟a, 肖竹梅a, 左文华a, 杨勇a,b,*()   

  1. a 厦门大学化学化工学院 固体表面物理化学国家重点实验室 厦门 361005
    b 厦门大学能源学院 厦门 361102
  • 投稿日期:2021-06-09 发布日期:2021-07-20
  • 通讯作者: 杨勇
  • 作者简介:

    谢佶晟, 2021年于厦门大学化学系获学士学位, 研究方向为钠离子电池层状过渡金属氧化物正极材料的失效及改性机理研究.

    肖竹梅, 2018年于南开大学化学系获学士学位, 现为厦门大学化学化工学院杨勇教授课题组硕士研究生. 研究方向为锂、钠离子电池中高比能正极材料的反应机理研究.

    左文华, 2020年于厦门大学获得博士学位, 师从杨勇教授, 目前主要从事钠离子电池层状过渡金属氧化物正极材料研究.

    杨勇, 厦门大学闽江计划特聘教授, 博士生导师, 国家杰出青年科学基金获得者. 1992年获厦门大学理学博士学位, 1997~1998年任英国牛津大学访问科学家. 主要研究方向为能源电化学、材料物理化学及表面物理化学.

  • 基金资助:
    国家重点研发专项课题(2016YFB0901502); 厦门大学化学学科拔尖学生培养试验计划资助项目

Research Progresses of Sodium Cobalt Oxide as Cathode in Sodium Ion Batteries

Jisheng Xiea, Zhumei Xiaoa, Wenhua Zuoa, Yong Yanga,b()   

  1. a State Key Laboratory for Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
    b School of Energy Research, Xiamen University, Xiamen 361102, China
  • Received:2021-06-09 Published:2021-07-20
  • Contact: Yong Yang
  • Supported by:
    National Key Research and Development Program of China(2016YFB0901502); funding project of the Top-notch Students Scientific Development Pilot Program (Chemistry) of Xiamen University

Sodium ion batteries have regained widespread attention in the field of large-scale electrochemical energy storage by virtue of their widely distributed and low-cost sodium resources. Among many of the cathode materials (layered, tunnel-like, polyanionic type and Prussian-blue type, etc.), layered transition metal oxide materials have received extensive research attention due to the features of high specific capacity, relatively good electrochemical reversibility, and rich and adjustable chemical composition. Sodium cobalt oxide is one of the most typical layered transition metal oxides. A lot of research has been done about sodium cobalt oxide since the 1980s. Although compared with other energy storage systems (such as lithium cobalt oxide materials which has the similar composition), sodium cobalt oxide does not take more advantage in electrochemical performance (like rate performance, cycle performance, etc.), but it can be observed from the charge and discharge curve that sodium cobalt oxide has undergone complex electrochemical processes, which means that it has a bunch of information on the degradation mechanisms during the charge and discharge processes. The correlation studies of the failure mechanism during the charging and discharging processes of sodium cobalt oxide (including the structure changes and the charge compensation mechanisms) are of great significance for the deep understanding of the layered oxide systems in sodium ion batteries. Therefore, on the basis of introducing the common crystal structure types and the synthesis phase diagram of sodium cobalt oxides, this article focuses on reviewing the structure changes (including phase transition and Na+/ vacancy ordering) and charge compensation mechanisms of sodium cobalt oxides with different crystal structures during the charging and discharging. At the same time, the correlation between the mechanisms above and electrochemical performance is discussed. This review aims to provide support for the in-depth study and establishment of the structure-activity relationship in the electrochemical processes of layered transition metal oxide cathode materials.

Key words: sodium ion battery, cathode material, sodium cobalt oxide, structure change, charge compensation mechanism, structure-activity relationship