Graphitic Nanocarbon with Engineered Defects for High-Performance Potassium-Ion Battery Anodes
Hedhili, Mohamed N.
Da Costa, Pedro M. F. J.
Alshareef, Husam N.
KAUST DepartmentFunctional Nanomaterials and Devices Research Group
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant NumberURF/1/2980-01-01
Embargo End Date2020-06-20
Permanent link to this recordhttp://hdl.handle.net/10754/656070
MetadataShow full item record
AbstractThe application of graphite anodes in potassium-ion batteries (KIB) is limited by the large variation in lattice volume and the low diffusion coefficient of potassium ions during (de)potassiation. This study demonstrates nitrogen-doped, defect-rich graphitic nanocarbons (GNCs) as high-performance KIB anodes. The GNCs with controllable defect densities are synthesized by annealing an ethylenediaminetetraacetic acid nickel coordination compound. The GNCs show better performance than the previously reported thin-walled graphitic carbonaceous materials such as carbon nanocages and nanotubes. In particular, the GNC prepared at 600 °C shows a stabilized capacity of 280 mAh g−1 at 50 mA g−1, robust rate capability, and long cycling life due to its high-nitrogen-doping, short-range-ordered, defect-rich graphitic structure. A high capacity of 189 mAh g−1 with a long cycle life over 200 cycles is demonstrated at a current density of 200 mA g−1. Further, it is confirmed that the potassium ion storage mechanism of GNCs is different from that of graphite using multiple characterization methods. Specifically, the GNCs with numerous defects provide more active sites for the potassiation process, which results in a final discharge product with short-range order. This study opens a new pathway for designing graphitic carbonaceous materials for KIB anodes.
SponsorsThe research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST) (Grant No. URF/1/2980-01-01), Natural Science Foundation of Jiangsu Province (Grant No. BK20170999), and the National Natural Science Foundation of China (Grant No. 21805136). The authors thank the Core Laboratories at KAUST for their excellent support
JournalAdvanced Functional Materials