MnO@Al2O3 with high cycle performance via depressing solution of Mn for lithium-ion batteries anode

The capacities fade of manganese oxide originating from the well-known Mn dissolution in electrolyte. Suppressing the dissolution of Mn elements can result in a significant enhancement of the cycling performance of anode materials. Surface coating of active material is one of the most effective strategies, especially; aluminum oxide is most widely adopted coating material to improve anode materials performance. Here we report, Al2O3 layer is coated on the surface and little Al-ions are diffused into MnO electrode prevents dissolution of manganese elements in electrolyte, decrease capacity fade and maintain structure stability of the active material. MnO@Al2O3 composite electrode delivers an initial discharging/charging capacities of 1390/822 mA h g−1 at current rate of 100 mA g−1 and maintains high reversible charging capacity of 855 mA h g−1 after 100 cycles. Al2O3 coating prevents decomposition of manganese oxide in electrolyte and enhances the cycling stability.