期刊
NANO ENERGY
卷 77, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105123
关键词
Sodium ion battery; Sb/NiSb alloy; Binder-free anode; Intermetallic compound; Electrodeposition
类别
资金
- Natural Science Foundation of Zhejiang Province [LY18B030005, LH19E010001]
- National Natural Science Foundation of China (NSFC) [51871205, 51801196]
Antimony has attracted a substantial amount of attention and has been proven to be the most promising anode material for sodium-ion batteries (SIBs) due to its suitable sodium insertion plateaus and high theoretical storage capacity. However, the dramatic volume expansion (up to 390%) during sodiation/desodiation results in severe structural deterioration and rapid capacity decay. As a consequence, antimony anodes exhibit poor cycling stability. Herein, we report a binder-free Sb/NiSb alloy prepared by a controllable electrodeposition process. The inactive nickel provided both good conductivity and structural reinforcement to reduce the large volume expansion/contraction, which endowed the Sb/NiSb anode with excellent cycle stability (521 mAh.g(-1) upon 100 cycles) and rate performance (above 400 mAh.g(-1) at 2000 mA.g(-1)) that were superior to those of the bare Sb anode. The excellent Na storage performance of the Sb/NiSb anode was attributed to the synergistic effect of its cauliflower-like structure and the alloying effect of the Sb/NiSb. The operando XRD results indicated that the reaction mechanism resembled that of analogous transition metal antimonides. In addition, a stable solid electrolyte interface (SEI) was observed with operando XRD and HR-TEM of the Sb/NiSb anode. The cost-effective preparation of Sb/NiSb composite anodes and their excellent electrochemical properties offer the potential to prepare a broad spectrum of binder-free metallic alloys (e.g., Bi and Sn) as high-performance anode materials for SIBs.
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