Hollow Porous Hierarchical-Structured 0.5Li2MnO3·0.5LiMn0.4Co0.3Ni0.3O2 as a High-Performance Cathode Material for Lithium-Ion Batteries.

ABSTRACT

We report a novel hollow porous hierarchical-architectured 0.5Li2MnO3·0.5LiMn0.4Co0.3Ni0.3O2 (LLO) for lithium-ion batteries (LIBs). The obtained lithium-rich layered oxides possess a large inner cavity, a permeable porous shell, and excellent structural robustness. In LIBs, such unique features are favorable for fast Li+ transportation and can provide sufficient contact between active materials and electrolytes, accommodate more Li+, and improve the kinetics of the electrochemical reaction. The as-prepared LLO displays an extremely high initial discharge capacity (296.5 mAh g-1 at 0.2 C), high rate capability (162.6 mAh g-1 at 10 C), and excellent cycling stability (237.6 mAh g-1 after 100 cycles at 0.5 C and 153.8 mAh g-1 after 200 cycles at 10 C). These values are superior to most literature data.