Enhanced Capacity and Cycle Stability of a Pomegranate-Like Si/rGO Composite Anode by Electrostatic Self-Assembly and Spray-Drying Processes
2022
Su, Peng | Wu, Jian | Yang, Yi | Gao, Ling | Shen, Liming | Bao, Ningzhong
Si is considered one of the most promising anodes for lithium-ion batteries due to its ultrahigh theoretical capacity and abundant resource reserves. However, the poor conductivity and large volume expansion of silicon-based anode materials seriously affect their charge–discharge efficiency and cycling stability. In this study, the dispersion of Si nanoparticles and graphene oxide (GO) is atomized into small droplets, followed by electrostatic self-assembly, spray-drying, and high-temperature annealing to obtain the pomegranate-like Si/rGO composite (ES-Si/rGO) with a concentrated size of ∼2 μm. It is noteworthy that the preparation is under mild conditions and easy to scale up. As a result, ES-Si/rGO shows a high rate performance at wide current densities and maintains a reversible capacity of 969.3 mAh g–¹ after 200 cycles at 500 mA g–¹. The compact rGO improves the electrical conductivity and slows down the structure deterioration. This work is of great potential toward the scalable preparation of silicon-based anodes.
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