3 years ago

Hierarchical Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 hollow spherical as cathode material for Li-ion battery

Tianjiao Zhu, Mengwei Yuan, Genban Sun, Yu Zhang, Shulan Ma, Huifeng Li, Liu Lin

Abstract

Lithium-rich manganese-based layered materials have been considered as the most promising cathode materials for future high-energy-density lithium-ion batteries. However, a great loss of irreversible capacity at the initial cycle, poor cycle stability, and rate performance severely restrict its application. Herein, we develop a new strategy to synthesize hierarchical hollow Li1.2Mn0.54Ni0.13Co0.13O2 microspheres using sucrose and cetyltrimethylammonium bromide as a soft template combined with hydrothermal assisted homogeneous precipitation method. The hollow microspheres are assembled by the primary particles with the size of 50 nm. As a result, the as-prepared material exhibits high reversible capacity, good cycling stability, and excellent rate property. It delivers a high initial discharge capacity of 305.9 mAh g−1 at 28 mA g−1 with coulombic efficiency of 80%. Even at high current density of 560 mA g−1, the sample also shows a stable discharge capacity of 215 mAh g−1. The enhanced electrochemical properties are attributed to the stable hierarchical hollow sphere structure and the appropriate contact area between electrode and electrolyte, thus effectively improve the lithium-ion intercalation and deintercalation kinetics.

Graphical abstract

Publisher URL: https://link.springer.com/article/10.1007/s11051-017-4033-1

DOI: 10.1007/s11051-017-4033-1

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