SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (10): 2699-2706.DOI: 10.1016/j.cjche.2020.07.011

• Energy, Resources and Environmental Technology • Previous Articles    

FeS2@TiO2 nanorods as high-performance anode for sodium ion battery

Zhenxiao Lu1, Wenxian Wang1, Jun Zhou2, Zhongchao Bai1   

  1. 1 College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
    2 Department of Mechanical Engineering, Pennsylvania State University Erie, The Behrend College, Erie, PA 16563, USA
  • Received:2020-05-09 Revised:2020-07-07 Online:2020-12-03 Published:2020-10-28
  • Contact: Wenxian Wang, Zhongchao Bai
  • Supported by:
    This work was supported by the National Nature Science Foundation of China (No. 51775366).

FeS2@TiO2 nanorods as high-performance anode for sodium ion battery

Zhenxiao Lu1, Wenxian Wang1, Jun Zhou2, Zhongchao Bai1   

  1. 1 College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
    2 Department of Mechanical Engineering, Pennsylvania State University Erie, The Behrend College, Erie, PA 16563, USA
  • 通讯作者: Wenxian Wang, Zhongchao Bai
  • 基金资助:
    This work was supported by the National Nature Science Foundation of China (No. 51775366).

Abstract: Sodium-ion battery (SIB) is an ideal device that could replace lithium-ion battery (LIB) in grid-scale energy storage system for power because of the low cost and rich reserve of raw material. The key challenge lies in developing electrode materials enabling reversible Na+ insertion/desertion and fast reaction kinetics. Herein, a core-shell structure, FeS2 nanoparticles encapsulated in biphase TiO2 shell (FeS2@TiO2), is developed towards the improvement of sodium storage. The diphase TiO2 coating supplies abundant anatase/rutile interface and oxygen vacancies which will enhance the charge transfer, and avoid severe volume variation of FeS2 caused by the Na+ insertion. The FeS2 core will deliver high theoretical capacity through its conversion reaction mechanism. Consequently, the FeS2@TiO2 nanorods display notable performance as anode for SIBs including long-term cycling performance (637.8 mA·h·g-1 at 0.2 A·g-1 after 300 cycles, 374.9 mA·h·g-1 at 5.0 A·g-1 after 600 cycles) and outstanding rate capability (222.2 mA·h·g-1 at 10 A·g-1). Furthermore, the synthesized FeS2@TiO2 demonstrates significant pseudocapacitive behavior which accounts for 90.7% of the Na+ storage, and efficiently boosts the rate capability. This work provides a new pathway to fabricate anode material with an optimized structure and crystal phase for SIBs.

Key words: Sodium-ion battery, FeS2, Biphase TiO2 coating, Pseudocapacitive behavior

摘要: Sodium-ion battery (SIB) is an ideal device that could replace lithium-ion battery (LIB) in grid-scale energy storage system for power because of the low cost and rich reserve of raw material. The key challenge lies in developing electrode materials enabling reversible Na+ insertion/desertion and fast reaction kinetics. Herein, a core-shell structure, FeS2 nanoparticles encapsulated in biphase TiO2 shell (FeS2@TiO2), is developed towards the improvement of sodium storage. The diphase TiO2 coating supplies abundant anatase/rutile interface and oxygen vacancies which will enhance the charge transfer, and avoid severe volume variation of FeS2 caused by the Na+ insertion. The FeS2 core will deliver high theoretical capacity through its conversion reaction mechanism. Consequently, the FeS2@TiO2 nanorods display notable performance as anode for SIBs including long-term cycling performance (637.8 mA·h·g-1 at 0.2 A·g-1 after 300 cycles, 374.9 mA·h·g-1 at 5.0 A·g-1 after 600 cycles) and outstanding rate capability (222.2 mA·h·g-1 at 10 A·g-1). Furthermore, the synthesized FeS2@TiO2 demonstrates significant pseudocapacitive behavior which accounts for 90.7% of the Na+ storage, and efficiently boosts the rate capability. This work provides a new pathway to fabricate anode material with an optimized structure and crystal phase for SIBs.

关键词: Sodium-ion battery, FeS2, Biphase TiO2 coating, Pseudocapacitive behavior