Chemically anchored two-dimensional-SiOₓ/zero-dimensional-MoO₂ nanocomposites for high-capacity lithium storage materials
2020
Kim, Soohwan | Yoo, Hyundong | Kim, Hansu
Silicon oxides are promising alternatives for graphite anodes in lithium-ion batteries. SiOₓ nanosheets exhibit favorable anodic performances, including outstanding capacity retention and dimensional stability, due to their unique two-dimensional (2D) microstructures, but suffer from low specific capacity and poor initial coulombic efficiency. Here we demonstrate that chemically anchoring of molybdenum dioxide (MoO₂) nanoparticles on the surface of 2D-SiOₓ nanosheets via a Mo–O–Si bond boosts both the reversible capacity and initial coloumbic efficiency without sacrificing the useful properties of 2D-SiOₓ nanosheets. The enhancements can be attributed to the introduction of a zero-dimensional MoO₂ nano-object, which offers abnormal storage sites for lithium. The proposed nano-architecturing shows how we can maximize the advantages of 2D nanomaterials for energy storage applications.
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