Coating of SnO2 -NiO nanoparticles with ultrathin graphite nanosheets as a high-performance anode material for lithium-ion batteries

The lithium-ion battery anodes have always sought out the best possible properties with regards to large capacity, high rate, as well as long-term cycling stability. For this work, a straightforward hydrothermal and high-speed ball mill procedure was employed to create the SnO 2 -NiO-C anode material. Ion cycling and embedding are ideal for NiO nanoparticles with a unique hexagonal crystal structure, which can stabilize the structure and prevent SnO 2 from becoming coarser. The graphite encapsulated in the outer layer can effectively prevent volume expansion during the cycle as well. According to the findings, the SnO 2 -NiO-C composite exhibits a significant reversible capacity of 1224.3 mAh g − 1 after 300 cycles at 0.2 A g − 1 and from the fourth cycle onwards, the Cullen efficiency remains above 97%. And it also possesses a long-term cycling stability of 820.1 mAh g − 1 after 1000 cycles at 1.0 A g − 1 . Also, a significant rate property can reach 507.1 mAh g − 1 at 5.0 A g − 1 . Therefore, the SnO 2 -NiO-C anode material for Li-ion batteries is promising on account of its excellent electrochemical performance.