RIS ID
127881
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.
Publication Details
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.