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| Type |
Poster Presentation |
| Area |
Environmental Energy |
| Room No. |
Exhibition Hall 2 |
| Time |
4월 18일 (목요일) 11:00~12:30 |
| Code |
ENVR.P-513 |
| Subject |
Ultrafast Microwave-assisted Carbonization and Reduction for Carbon-encapsulated Silicon-graphene nanocomposites as Lithium-ion Battery Anode
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| Authors |
Jong Min Kim, Yuanzhe Piao*
Graduate School of Convergence Science and Technology, Seoul National University, Korea
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| Abstract |
Conventional thermal treatment for carbonization and reduction of graphene oxide is not energy and time efficient. This work presents ultrafast (~ 4 s) simultaneous carbonization of carbon precursor and reduction of graphene via microwave irradiation using a cheap commercial microwave oven. Polydopamine-coated silicon nanoparticles are mixed with electrochemically exfoliated graphene and fabricated into a freestanding anode film through simple vacuum filtration. Many preserved sp2 domains of electrochemically exfoliated graphene enable efficient microwave absorption which produces heat to carbonize Polydopamine in few seconds. The produced heat also reduces oxidized electrochemically exfoliated graphene to recover more sp2 domain, which increases electrical conductivity. As a consequence, the as-prepared carbon-encapsulated silicon-graphene lithium-ion battery anode film delivers a reversible specific capacity of 1744 mAh g-1 at a current density of 0.1 A g-1 and good cycling stability of 662 mAh g-1 at 1.0 A g-1 after 200 cycles. This extremely fast method can be a better alternative to conventional tedious thermal treatment for graphene-related nanocomposite synthesis. |
| E-mail |
vitamin663@gmail.com |
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123rd General Meeting of the KCS