A cage compound precursor-derived Sb/Sb2O4/Fe3C nanocomposite anchored on reduced graphene oxide as an anode for potassium ion batteries
A cage compound precursor-derived Sb/Sb2O4/Fe3C nanocomposite anchored on reduced graphene oxide as an anode for potassium ion batteries
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DOI：
10.1039/d0nj05160h
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发表时间：
2021-01
影响因子：
3.3
通讯作者：
Jianwen Wang;Mengyang Cao;Feng Xu;Xiuli Zhu;K. Rashid;Yan Wang;Lu Huang
中科院分区：
文献类型：
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作者：
Jianwen Wang;Mengyang Cao;Feng Xu;Xiuli Zhu;K. Rashid;Yan Wang;Lu Huang
地壳中丰富的钾储量及其较低的K/K+氧化还原电位（−2.93 V）使钾离子电池（PIB）成为下一代离子电池的潜在候选者。锑（Sb）对于PIB具有高的理论比容量，但是Sb基电极的粉碎严重缩短了它们的循环寿命并且阻碍了它们在PIB中的使用。在此，制备了具有均匀分布的锚定在还原氧化石墨烯上的笼状化合物衍生的Sb/Sb 2 O 4/Fe 3C纳米复合材料，并将其用作PIB的阳极。得益于Sb/Sb 2 O 4的高容量和可促进SEI膜可逆溶解的催化剂Fe 3C，阳极在500 mA g−1下在280次循环中提供234 mA h g− 1的可逆比容量，在2000 mA g−1下在1244次循环中提供108 mA h g− 1的长期循环性能。
The abundant reserves of potassium in the earth's crust and its low K/K+ redox potential (−2.93 V) make potassium ion batteries (PIBs) a potential candidate for next-generation ion batteries. Antimony (Sb) has a high theoretical specific capacity for PIBs, but the pulverization of Sb-based electrodes severely shortens their cycle lifetimes and hinders their use in PIBs. Here, a cage compound precursor-derived Sb/Sb2O4/Fe3C nanocomposite anchored on reduced graphene oxide with uniform distribution is fabricated and used as an anode for PIBs. Benefitting from the high capacity of Sb/Sb2O4 and the catalyst Fe3C that can promote the reversible dissolution of SEI film, the anode delivers a reversible specific capacity of 234 mA h g−1 at 500 mA g−1 over 280 cycles and a long-term cycling performance of 108 mA h g−1 at 2000 mA g−1 over 1244 cycles.