Skip to main content
placeholder image

High performance MnO@C microcages with a hierarchical structure and tunable carbon shell for efficient and durable lithium storage

Journal Article


Abstract


  • A MnO@C microcage with a multi-structure and tunable carbon shell was fabricated through a facile bio-inspired synthesis strategy for highly reversible Li storage. Micrometer-sized MnO unit aggregates were covered with a porous carbon shell outside with a thickness of about 0.2 μm, and a graphene-analogous carbon network inside the MnO@C microcages. The carbon shell could be tunable by a graphene-base shell. The unique double-carbon-coating structure of the MnO@C microcages enabled realizing the high Li-storage performance of the MnO particles with a micrometer size. The electrode containing the MnO@C microcages delivered a high reversible capacity of 1450.5 mA h g -1 after 270 cycles at a current density of 0.1 A g -1 , good rate capability, and outstanding cycling stability with a retention capacity of 805 mA h g -1 after 2000 cycles at a high current density of 1 A g -1 . Quantitative kinetic analysis indicated that around 40% of the charge storage came from the capacitive contribution of the microcage structure. It was found that the tunable graphene-base shell could enhance the Li-ion diffusion rate significantly, and enable a stable ultralong long life cycle performance and enhanced rate performance of the microcages.

Authors


  •   Hou, Chuanxin (external author)
  •   Tai, Zhixin (external author)
  •   Zhao, Lanling (external author)
  •   Zhai, Yanjie (external author)
  •   Hou, Yue (external author)
  •   Fan, Yuqi (external author)
  •   Dang, Feng (external author)
  •   Wang, Jun (external author)
  •   Liu, Hua K.

Publication Date


  • 2018

Citation


  • Hou, C., Tai, Z., Zhao, L., Zhai, Y., Hou, Y., Fan, Y., Dang, F., Wang, J. & Liu, H. (2018). High performance MnO@C microcages with a hierarchical structure and tunable carbon shell for efficient and durable lithium storage. Journal of Materials Chemistry A, 6 (20), 9723-9736.

Scopus Eid


  • 2-s2.0-85047515362

Number Of Pages


  • 13

Start Page


  • 9723

End Page


  • 9736

Volume


  • 6

Issue


  • 20

Place Of Publication


  • United Kingdom

Abstract


  • A MnO@C microcage with a multi-structure and tunable carbon shell was fabricated through a facile bio-inspired synthesis strategy for highly reversible Li storage. Micrometer-sized MnO unit aggregates were covered with a porous carbon shell outside with a thickness of about 0.2 μm, and a graphene-analogous carbon network inside the MnO@C microcages. The carbon shell could be tunable by a graphene-base shell. The unique double-carbon-coating structure of the MnO@C microcages enabled realizing the high Li-storage performance of the MnO particles with a micrometer size. The electrode containing the MnO@C microcages delivered a high reversible capacity of 1450.5 mA h g -1 after 270 cycles at a current density of 0.1 A g -1 , good rate capability, and outstanding cycling stability with a retention capacity of 805 mA h g -1 after 2000 cycles at a high current density of 1 A g -1 . Quantitative kinetic analysis indicated that around 40% of the charge storage came from the capacitive contribution of the microcage structure. It was found that the tunable graphene-base shell could enhance the Li-ion diffusion rate significantly, and enable a stable ultralong long life cycle performance and enhanced rate performance of the microcages.

Authors


  •   Hou, Chuanxin (external author)
  •   Tai, Zhixin (external author)
  •   Zhao, Lanling (external author)
  •   Zhai, Yanjie (external author)
  •   Hou, Yue (external author)
  •   Fan, Yuqi (external author)
  •   Dang, Feng (external author)
  •   Wang, Jun (external author)
  •   Liu, Hua K.

Publication Date


  • 2018

Citation


  • Hou, C., Tai, Z., Zhao, L., Zhai, Y., Hou, Y., Fan, Y., Dang, F., Wang, J. & Liu, H. (2018). High performance MnO@C microcages with a hierarchical structure and tunable carbon shell for efficient and durable lithium storage. Journal of Materials Chemistry A, 6 (20), 9723-9736.

Scopus Eid


  • 2-s2.0-85047515362

Number Of Pages


  • 13

Start Page


  • 9723

End Page


  • 9736

Volume


  • 6

Issue


  • 20

Place Of Publication


  • United Kingdom