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

ABSTRACT: 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 (scCO2) 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 ?-? interaction. Using scCO2, 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 scCO2 for a highly stable lithium battery anode material.

SUBMITTER: Lee SH 

PROVIDER: S-EPMC4989224 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature

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

Lee Sang Ha SH   Park Sengyoen S   Kim Min M   Yoon Dohyeon D   Chanthad Chalathorn C   Cho Misuk M   Kim Jaehoon J   Park Jong Hyeok JH   Lee Youngkwan Y  

Scientific reports 20160818

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 (scCO2) 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 π-π interaction. Using scCO2, well-dispers  ...[more]

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