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Pseudocapacitance contribution to three-dimensional micro-sized silicon@Fe3O4@few-layered graphene for high-rate and long-life lithium ion batteries

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Abstract A one-step and scalable strategy is adopted to synthesize egg-like silicon-based anode materials for Li-ion batteries. Such an artificially designed micro-sized silicon particles are dually protected by amorphous Fe3O4… Click to show full abstract

Abstract A one-step and scalable strategy is adopted to synthesize egg-like silicon-based anode materials for Li-ion batteries. Such an artificially designed micro-sized silicon particles are dually protected by amorphous Fe3O4 and few-layered graphene (denoted as Si@ Fe3O4@FLG). This robust integrated spherical structure capitalizes on the accommodation of volume expansion of micro-sized silicon, affording a remarkable long-term electrochemical performance, i.e., superior reversible capacity of 637 mA h g−1 (an impressive volumetric capacity of 1146.6 Ah L−1) after 1600 cycles at a large current density of 2 A g−1. A detailed investigation into electrochemical kinetic reveals lithium ion charge storage capability greatly depended on the pseudocapacitance-controlled behavior. The impressive electrochemical performance demonstrates that the Si@Fe3O4@FLG anode has great potential to meet the challenges of next-generation large-power, long-term lifespan energy storage in use of inexpensive and scalable micro-sized silicon as anode.

Keywords: layered graphene; sized silicon; fe3o4 layered; micro sized; ion batteries

Journal Title: Materials Today Communications
Year Published: 2019

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