Crystal Reconstruction of Binary Oxide Hexagonal Nanoplates: Monocrystalline Formation Mechanism and High Rate Lithium-Ion Battery Applications
Structural design and/or carbon modification are the most important strategies to improve the materials performance in many applications, where the metal (oxide)-based anode design gains great attention in metal ion batteries due to their high capacities. However, achieving these two goals within one-step remains challenging for the lower cost and higher efficiency to satisfy the demand in practical application. Herein, we report a new approach for crystal reconstruction of metal oxide by acetylene treatment, in which a hierarchical binary oxide decorated with carbon (i.e., Mn2Mo3O8@C) are introduced. The mechanism of constructing unique monocrystalline hexagonal nanoplates and uniform carbon coating is discussed in detail. Benefiting from the uniqueness of structure and compositions, the Mn2Mo3O8@C demonstrates an extremely high lithium storage capacity of 890 mAh g-1 and good rate capacities at 20 A g-1 over 1000 cycles. In addition, the high rate capabilities and long cycle lifespan are further confirmed when the Mn2Mo3O8@C anode is matched with the nickel-rich layered oxide cathode. This study not only introduces a new binary oxide anode with high performances in lithium (ion) batteries, but also presents a convenient methodology to design more advanced functional materials.
- This article is part of the themed collection: 2020 Nanoscale HOT Article Collection