Abstract
To increase the energy storage density of lithium-ion batteries, silicon anodes have been explored due to their high capacity. One of the main challenges for silicon anodes are large volume variations during the lithiation processes. Recently, several high-performance schemes have been demonstrated with increased life cycles utilizing nanomaterials such as nanoparticles, nanowires, and thin films. However, a method that allows the large-scale production of silicon anodes remains to be demonstrated. Herein, we address this question by suggesting new scalable nanomaterial-based anodes. Si nanoparticles were grown on nanographite flakes by aerogel fabrication route from Si powder and nanographite mixture using polyvinyl alcohol (PVA). This silicon-nanographite aerogel electrode has stable specific capacity even at high current rates and exhibit good cyclic stability. The specific capacity is 455 mAh g−1 for 200th cycles with a coulombic efficiency of 97% at a current density 100 mA g−1.
Highlights
To increase the energy storage density of lithium-ion batteries, silicon anodes have been explored due to their high capacity
Si nanoparticles were grown on nanographite flakes by aerogel fabrication route from Si powder and nanographite using polyvinyl alcohol (PVA) by a simple, cost-efficient, and scalable method, which does not require expensive equipments for the synthesis
We show that electrodes prepared based on this structure show high specific capacity and cycling stability, being a potentially cost-effective method for Si-based anodes
Summary
To increase the energy storage density of lithium-ion batteries, silicon anodes have been explored due to their high capacity. Si nanoparticles were grown on nanographite flakes by aerogel fabrication route from Si powder and nanographite mixture using polyvinyl alcohol (PVA) This silicon-nanographite aerogel electrode has stable specific capacity even at high current rates and exhibit good cyclic stability. Si is abundant, inexpensive, and environmentally friendly, making it an attractive anode material for lithium-ion batteries[10,11,12] Despite these advantages, Si-based lithium-ion batteries suffer from large volume expansion during the lithiation process, poor electrical conductivity, and short life cycles[10,11,12,13]. Www.nature.com/scientificreports equipment, resulting in expensive synthesis and greater overall costs, limiting the practical application of Si in lithium-ion batteries
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