Preprint Article Version 1 This version is not peer-reviewed

Porous (Swiss-Cheese) Graphite

Version 1 : Received: 7 April 2018 / Approved: 8 April 2018 / Online: 8 April 2018 (12:07:13 CEST)

How to cite: Abrahamson, J.P.; Rajagopalan, R.; Vander Wal, R.L. Porous (Swiss-Cheese) Graphite. Preprints 2018, 2018040095 (doi: 10.20944/preprints201804.0095.v1). Abrahamson, J.P.; Rajagopalan, R.; Vander Wal, R.L. Porous (Swiss-Cheese) Graphite. Preprints 2018, 2018040095 (doi: 10.20944/preprints201804.0095.v1).

Abstract

Porous graphite was prepared without the use of template by rapidly heating the carbonization products from mixtures of anthracene, flourene, and pyrene with a CO2 laser. Rapid CO2 laser heating at a rate of 1.8 × 10 6 °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 interface 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 to 4.2 V.

Subject Areas

carbonization; laser annealing; mesophase; graphitization; porous carbon

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