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

Zhenxiao Lu, Wenxian Wang, Jun Zhou, Zhongchao Bai

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Pages (from-to)2699-2706
Number of pages8
JournalChinese Journal of Chemical Engineering
Volume28
Issue number10
DOIs
StatePublished - Oct 2020

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Biochemistry
  • Chemistry(all)
  • Chemical Engineering(all)

Fingerprint Dive into the research topics of 'FeS<sub>2</sub>@TiO<sub>2</sub> nanorods as high-performance anode for sodium ion battery'. Together they form a unique fingerprint.

Cite this