Accurate hierarchical control of hollow crossed NiCo2O4 nanocubes for superior lithium storage

作者：Guo, Hong^*; Liu, Lixiang; Li, Tingting; Chen, Weiwei; Liu, Jiajia; Guo, Yuanyuan; Guo, Yicheng

来源：Nanoscale, 2014, 6(10): 5491-5497.

DOI：10.1039/c4nr00930d

• MORPHOLOGY-CONTROLLED SYNTHESIS
• ENHANCED PHOTOCATALYTIC ACTIVITY
• TEMPLATE-FREE SYNTHESIS
• LI-ION BATTERIES
• ELECTROCHEMICAL CAPACITORS
• ANODE MATERIAL
• PERFORMANCE
• HYBRID
• NANOTUBES
• SUPERCAPACITORS

An effective approach of simultaneously coordinating etching and precipitation reactions is employed to prepare hollow crossed NiCo2O4 nanocubes as anode materials for lithium-ion batteries. Firstly, amorphous hollow (NiCox)O(OH) nanoboxes form uniformly, and subsequent calcination results in the formation of NiCo2O4 nanocubes that exhibit a stable reversible capacity of 1160 mA h g(-1) at constant current density of 200 mA g(-1) with capacity retention of over 91.1% after 200 cycles. The unique hollow structure can shorten the Li-ion diffusion path, which benefits the rate of performance. Furthermore, the hollow structure offers a sufficient void space to alleviate the mechanical stress caused by volume change. Additionally, the multi-element characteristics of active materials allow the volume change to take place in a stepwise manner. Therefore, hollow crossed NiCo2O4 nanocube electrodes exhibit excellent electrochemical performance. This method is simple and of low cost, which may open a new avenue for fast synthesis of hollow crossed structural nano-functional materials for energy storage, catalysts, sensors and other new applications.

• 出版日期2014
• 单位云南大学