Journal
NANO ENERGY
Volume 62, Issue -, Pages 419-425Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2019.05.035
Keywords
Graphite; Edge functionalization; Thionic acid; Anodes; Lithium ion batteries
Categories
Funding
- Young Talent Fellowship program through South China University of Technology
- Fundamental Research Funds for the Central Universities [2018JQ06]
- Creative Research Initiative (CRI) program through the National Research Foundation (NRF) of Korea [2014R1A3A2069102]
- BK21 Plus program through the National Research Foundation (NRF) of Korea [10Z20130011057]
- Science Research Centre (SRC) program through the National Research Foundation (NRF) of Korea [2016R1A5A1009405]
- Basic Science Research program through the National Research Foundation (NRF) of Korea [2018R1D1A1B07041085, 2018R1A6A3A11050815]
- National Research Foundation of Korea [2018R1A6A3A11050815, 2018R1D1A1B07041085] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Although lithium ion batteries (LIBs) hold great promise as a next generation power supply, the poor rate capability of the graphite that is mainly used as the battery anode limits high-performance LIBs. Compared to other reported carbon-based materials, however, its relatively low average working voltage still makes it attractive. Herein, we were able to introduce carbon disulfide (CS2) at the edges of graphene nanoplatelets (GnPs) with rich -C= S/-C-S bonds via ball-milling graphite in the presence of CS2. The resultant edge-thionic acid-functionalized GnPs (TAGnPs) exhibited a larger accessible surface area and smaller partic(l)e size than pristine graphite. Importantly, the TAGnPs retained a long-range-ordered layered structure similar to pristine graphite. When the TAGnPs were used as anode materials for LIBs, they displayed superior rate capability (e.g., high average reversible capacities of 228.3, 208.1, 141.0 and 80.6 mAh g(-1) at 0.5, 1, 2 and 5 A g(-1), respectvely) compared to pristine graphite and the reference edge-hydrogenated GnPs (HGnPs), which mainly have -C-H bonds at their edges. Theoretical calculations also indicated that the presence of -C=S/-C-S bonds at the edges of TAGnPs enabled stronger Li+ adsorption capability.
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