期刊
ACS NANO
卷 12, 期 12, 页码 12932-12940出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b08740
关键词
potassium-ion batteries; nanoporous antimony; micron-sized; tunable porosity; vacuum distillation; anode
类别
资金
- Shandong Provincial Natural Science Foundation (China) [ZR2017MB001]
- Shandong Provincial Science and Technology Key Project [2018GGX104002]
- Independent Innovation Foundation of Shandong University, The Young Scholars Program of Shandong University [2016WLJH03]
- State Key Program of National Natural Science of China [61633015, 51532005]
- 1000 Talent Plan program [31370086963030]
- National Natural Science Foundation of China [21371108]
- Project of the Taishan Scholar [ts201511004]
Potassium-ion batteries (KIBs) are considered favorable candidates for post-lithium-ion batteries, a quality attributed to their low cost, abundance as a resource, and high working potential (-2.93 V for K+/K). Owning to its relatively low potassiation potential and high theoretical capacity, antimony (Sb) is one of the most favorable anodes for KIBs. However, the large volume changes during K-Sb alloying and dealloying causes fast capacity degradation. In this report, nanoporous Sb (NP-Sb) is fabricated by an environmentally friendly vacuum-distillation method. The NP-Sb is formed via evaporating low-boiling-point zinc (Zn). The byproduct Zn can be recycled. It is further found that the morphology and porosity can be controlled by adjusting Zn-Sb composition and distillation temperature. The nanoporous structure can accommodate volume expansion and accelerate ion transport. The NP-Sb anode delivers an improved electrochemical performance. These results suggest that the vacuum-distillation method may provide a direction for the green, large-scale, and tunable fabrication of nanoporous materials.
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