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<p>Transition metal oxides (TMOs), such as Fe<sub>2</sub>O<sub>3</sub> and ZnO, are attractive as anode materials for battery applications due to their high theoretical specific capacity, environmental friendliness, and low price. However, poor electron conductivity or poor ion migration rate significantly limits the application of TMOs in lithium-ion batteries. To overcome both challenges, a heterostructured construction consisting of two different transition metal oxides proves to be effective for cycling stability and rate performance. In the present work, high-capacity α-Fe<sub>2</sub>O<sub>3</sub> and ZnO are combined into a nanocomposite with heterojunction by a facile wet ball milling process. Microstructural observation shows that the irregular ZnO surface is tightly wrapped by needle-like Fe<sub>2</sub>O<sub>3</sub>, and the interface of the two phases is in close contact at the atomic level. According to the energy band theory, heterojunction is formed at the interface. Electrochemical tests showed that the construction of heterojunction promotes the release of inert lithium from the inner ZnO, thus improving the initial Coulombic efficiency (ICE). The two phases synergistically regulate the electron/ion transport of the composites. In addition, the heterojunction at the interface of the two phases achieved rapid electron transport, resulting in excellent cycling and rate performance (∼472&#xa0;mA&#xa0;h/g at 200&#xa0;mA/g after 270 cycles). In fact, the straightforward and scalable technique without carbon which is used on this heterostructured metal oxide anodes provides a viable solution for future industrial-grade preparations.</p>

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Heterojunction design of ZnO/α-Fe2O3 with dual enhancement of ion/electron transport for energy storage

  • 期刊论文

  • 发表日期：

    2025年2月28日

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  • Qinyu Wu,
  • Shuai Wang,
  • Rui Cao,
  • Qian Lei,
  • Ziyang Ma,
  • Yangzhou Ma,
  • Guangsheng Song,
  • Ailin Xia

摘要

Transition metal oxides (TMOs), such as Fe2O3 and ZnO, are attractive as anode materials for battery applications due to their high theoretical specific capacity, environmental friendliness, and low price. However, poor electron conductivity or poor ion migration rate significantly limits the application of TMOs in lithium-ion batteries. To overcome both challenges, a heterostructured construction consisting of two different transition metal oxides proves to be effective for cycling stability and rate performance. In the present work, high-capacity α-Fe2O3 and ZnO are combined into a nanocomposite with heterojunction by a facile wet ball milling process. Microstructural observation shows that the irregular ZnO surface is tightly wrapped by needle-like Fe2O3, and the interface of the two phases is in close contact at the atomic level. According to the energy band theory, heterojunction is formed at the interface. Electrochemical tests showed that the construction of heterojunction promotes the release of inert lithium from the inner ZnO, thus improving the initial Coulombic efficiency (ICE). The two phases synergistically regulate the electron/ion transport of the composites. In addition, the heterojunction at the interface of the two phases achieved rapid electron transport, resulting in excellent cycling and rate performance (∼472 mA h/g at 200 mA/g after 270 cycles). In fact, the straightforward and scalable technique without carbon which is used on this heterostructured metal oxide anodes provides a viable solution for future industrial-grade preparations.