Journal of Inorganic Materials, Volume. 36, Issue 11, 1137(2021)
To improve the cycle performance of Sb-based anode materials for sodium storage, a simple two-step method (mechanical assisted chemical alloying and acid dissolution dealloying) is proposed to prepare nano sized and porous antimony/multi-walled carbon nanotubes (De-Sb/MCNT) composite. Different methods were employed to characterize the physicochemical and electrochemical properties of De-Sb/MCNT material as anode for sodium storage. The results show that compared to the Raw-Sb/MCNT obtained by direct ball milling of commercial raw Sb and MCNT, the De-Sb/MCNT material exhibits better cycle performance of sodium storage. At a current density of 200 mA·g-1, the De-Sb/MCNT delivers the reversible specific capacity of 408.6 mAh·g-1 with the initial Coulombic efficiency of 69.2%. After 330 cycles at 800 mA·g-1, the capacity retention rate can still retain 88%. The superior cycle performance of De-Sb/MCNT benefits from the “pre-pulverization” effect of mechanically-assisted chemical alloying/acid dissolution dealloying on commercial Sb, which promotes the nanocrystallization and porosity of the material. The De-Sb/MCNT relieves the volume expansion during charging and discharging, thus achieves excellent cycle stability. This dealloying process at ambient temperature is expected to provide a new approach for sodium storage of alloy anode materials with prolonged and stable cycles.
Get Citation
Copy Citation Text
Fanxin ZENG, Chuang LIU, Yuliang CAO.
Category: RESEARCH ARTICLE
Received: Feb. 21, 2021
Accepted: --
Published Online: Dec. 20, 2021
The Author Email: CAO Yuliang (ylcao@whu.edu.cn)