Flexible FeS@Fe2O3/CNT composite films as self-supporting anodes for high-performance lithium-ion batteries

Yaling Zhang; Shulong Chang; Ding Zhang; Sen Zhang; Lei Han; Li Ye; Rui Pang; Yuanyuan Shang; Anyuan Cao

doi:10.1088/1361-6528/abf194

Flexible FeS@Fe₂O₃/CNT composite films as self-supporting anodes for high-performance lithium-ion batteries

Nanotechnology. 2021 Apr 26;32(28). doi: 10.1088/1361-6528/abf194.

Authors

Yaling Zhang¹, Shulong Chang¹, Ding Zhang¹, Sen Zhang¹, Lei Han¹, Li Ye¹, Rui Pang¹, Yuanyuan Shang¹, Anyuan Cao²

Affiliations

¹ School of Physics and Microelectronics, and Key Laboratory of Material Physics, Zhengzhou University, Zhengzhou, Henan 450001, People's Republic of China.
² Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, People's Republic of China.

PMID: 33761495
DOI: 10.1088/1361-6528/abf194

Abstract

The transition metal sulfides/oxides have been considered as promising anode materials for lithium ion batteries due to their high theoretical capacities but have suffered limits from the unsatisfactory electronic conductivity and limited lifespan. Here, FeS micro-flowers are synthesized by hydrothermal treatment and are wared and grafted into layer-by-layer carbon nanotubes (CNT). Subsequently, FeS@Fe₂O₃/CNT composite films are obtained by annealing, during which the FeS micro-flowers are partially oxidized to core-shell FeS@Fe₂O₃micro-flowers. The FeS@Fe₂O₃/CNT composite electrodes exhibited high reversible capacity of 1722.4 mAh g^-1(at a current density of 0.2 A g^-1after 100 cycles) and excellent cycling stability (545.1 mAh g^-1at a current density of 2 A g^-1after 600 cycles) as self-supporting anodes. The prominent electrochemical performances are attributed to the unique reciprocal overlap architecture. This structure serves as a cushion to buffer large volume expansion during discharge/charge cycles, and ameliorates electrical conductivity. Due to their good specific capacity and cycle stability, these FeS@Fe₂O₃/CNT films have high potential application value to be used as high-performance anodes for lithium-ion, lithium sulfur and flexible packaging batteries.

Keywords: FeS@Fe2O3/CNT composite film; carbon nanotubes; lithium ion battery.