Enhanced Lithium Storage in Hierarchically Porous Carbon Derived from Waste Tea Leaves

Changhoon Choi, Seung Deok Seo, Byung Kook Kim, Dong Wan Kim

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36 Citations (Scopus)


In this study, highly nanoporous carbon (HCl-TW-Car) was successfully synthesized using a facile procedure combining acid treatment with a carbonization process that uses waste tea leaves from spent tea bags as raw materials. The acid treatment not only promotes the efficient removal of unnecessary inorganic impurities but also increases the product porosity to enable synthesis of hierarchically porous carbon materials with various micro-, meso-, and macropores. When used as an anode material for lithium-ion batteries, HCl-TW-Car demonstrated a much higher discharge capacity than is theoretically possible using graphite [479 mAh g-1 after the 200th cycle at a rate of 0.2C (1C = 372 mA g-1)] and exhibited greater rate capabilities compared with those of carbonated products from tea waste without acid treatment. It was shown that the good electrochemical properties of HCl-TW-Car can be ascribed to large Brunauer-Emmett-Teller (BET) surface area, well-formed hierarchical pores, and the prevention of unexpected electrochemical reactions from the reduction of metallic atoms.

Original languageEnglish
Article number39099
JournalScientific reports
Publication statusPublished - 2016 Dec 14

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science, ICT, and Future Planning (NRF-2016R1A2B2012728, NRF-2016M3A7B4909318) and by the institutional research program of the Korea Institute of Science and Technology (2E26081-16-054).

Publisher Copyright:
© The Author(s) 2016.

ASJC Scopus subject areas

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