Hierarchical Molybdenum Dioxide Microflowers Encapsulating Nickel Nanoparticles for High-Performance Lithium-Ion Battery Electrodes

4 years ago

Hierarchical Molybdenum Dioxide Microflowers Encapsulating Nickel Nanoparticles for High-Performance Lithium-Ion Battery Electrodes

Limin Wang, Chunli Wang, Dongming Yin, Xuxu Wang, Dongxia Yuan, Lianshan Sun, Yong Cheng, Qian Li

Herein, we propose a strategy to prepare Ni/MoO2 microflowers (Ni/MoO2/C) for lithium-ion batteries through a facile aqueous phase reaction at room temperature. NiMoO4 nanowires, as the Ni and Mo source, can chelate with dopamine to form a hierarchical microflower structure. The nickel content and the structure have significant influence on the performance for the final product. In the electrochemical measurements, the Ni/MoO2/C electrode reveals a high initial discharge capacity of 1117.3 mA h g−1 and a high capacity retention of 693.3 mA h g−1 after 100 cycles after an activated process at 1 A g−1. Meanwhile, an excellent rate capability from 0.1 A to 5 A g−1, where the discharge capacity is 1374 to 406 mA h g−1, is obtained. The high capability suggests that Ni/MoO2/C may be a promising candidate as an anode material for lithium-ion batteries. Flower power: Ni/Mo/PDA microflowers are prepared at room temperature, using NiMoO4 nanowires as the Ni and Mo source. In situ Ni doping greatly enhances the conductivity and stability of the Ni/MoO2/C structure and then reveals excellent performances when used as an electrode for lithium-ion batteries.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/celc.201700714