Hierarchical flower-like spinel manganese-based oxide nanosheets for high-performance lithium ion battery

Hierarchical flower-structured two-dimensional (2D) nanosheet is favorable for electrochemical reactions. The unique structure not only exposes the maximized active sites and shortens ion/electron diffusion channels, but also inhibits the structural strain during cycling processes. Herein, we report the hierarchical flower-like pure spinel manganese-based oxide nanosheets synthesized via a template-orientated strategy. The oriented template is fabricated by decomposition of carbonate obtained from bubble reaction via an alcohol-assisted hydrothermal process. The resultant spinel manganese-based oxide nanosheets simultaneously possess excellent rate capability and cycling stability. The high-voltage LiNi0.5Mn1.5O4 (LNMO-HF) has a uniform phase distribution without the common impurity phase LixNi1-xO2 and NixO. Besides, the LNMO-HF delivers high discharge capacity of 142.6 mA h g(-1) with specific energy density of 660.7 W h kg(-1) at 1 C under 55 degrees C. More importantly, the template-orientated strategy can be extended to the synthesis of LiMn2O4 (LMO), which can achieve 88.12% capacity retention after 1000 cycles.