Supercritical Carbon Dioxide-Assisted Process for Well-Dispersed Silicon/Graphene Composite as a Li ion Battery Anode

Sang Ha Lee, Sengyoen Park, Min Kim, Dohyeon Yoon, Chalathorn Chanthad, Misuk Cho, Jaehoon Kim, Jong Hyeok Park, Youngkwan Lee

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The silicon (Si)/graphene composite has been touted as one of the most promising anode materials for lithium ion batteries. However, the optimal fabrication method for this composite remains a challenge. Here, we developed a novel method using supercritical carbon dioxide (scCO 2) to intercalate Si nanoparticles into graphene nanosheets. Silicon was modified with a thin layer of polyaniline, which assisted the dispersion of graphene sheets by introducing I €-I € interaction. Using scCO 2, well-dispersed Si/graphene composite was successfully obtained in a short time under mild temperature. The composite showed high cycle performance (1,789 mAh/g after 250 cycles) and rate capability (1,690 mAh/g at a current density of 4,000 mA/g). This study provides a new approach for cost-effective and scalable preparation of a Si/graphene composite using scCO 2 for a highly stable lithium battery anode material.

Original languageEnglish
Article number32011
JournalScientific reports
Publication statusPublished - 2016 Aug 18


All Science Journal Classification (ASJC) codes

  • General

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