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 LiNi_0.5Mn_1.5O₄ (LNMO-HF) has a uniform phase distribution without the common impurity phase Li_xNi_1-xO₂ and Ni_xO. 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°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.