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Porous (Swiss-Cheese) Graphite

1
The EMS Energy Institute & Department of Energy and Mineral Engineering, The Pennsylvania State University, University Park, PA 16802, USA
2
Materials Research Institute, The Pennsylvania State University, PA 16802, USA
*
Author to whom correspondence should be addressed.
Received: 7 April 2018 / Revised: 24 April 2018 / Accepted: 24 April 2018 / Published: 2 May 2018
(This article belongs to the Special Issue Transmission Electron Microscopy and Carbon Materials)
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Abstract

Porous graphite was prepared without the use of template by rapidly heating the carbonization products from mixtures of anthracene, fluorene, and pyrene with a CO2 laser. Rapid CO2 laser heating at a rate of 1.8 × 106 °C/s vaporizes out the fluorene-pyrene derived pitch while annealing the anthracene coke. The resulting structure is that of graphite with 100 nm spherical pores. The graphitizablity of the porous material is the same as pure anthracene coke. Transmission electron microscopy revealed that the interfaces between graphitic layers and the pore walls are unimpeded. Traditional furnace annealing does not result in the porous structure as the heating rates are too slow to vaporize out the pitch, thereby illustrating the advantage of fast thermal processing. The resultant porous graphite was prelithiated and used as an anode in lithium ion capacitors. The porous graphite when lithiated had a specific capacity of 200 mAh/g at 100 mA/g. The assembled lithium ion capacitor demonstrated an energy density as high as 75 Wh/kg when cycled between 2.2 V and 4.2 V. View Full-Text
Keywords: carbonization; laser annealing; mesophase; graphitization; porous carbon carbonization; laser annealing; mesophase; graphitization; porous carbon
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Abrahamson, J.P.; Rajagopalan, R.; Vander Wal, R.L. Porous (Swiss-Cheese) Graphite. C 2018, 4, 27.

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