Three-dimensional hierarchically porous micro sponge-ball comprising anatase TiO2 nanodots and nitrogen-doped graphitic carbon as anodes for ultra-stable lithium-ion batteries
- Authors
- Lee, Jae Seob; Ka, Hye Seon; Saroha, Rakesh; Kang, Yun Chan; Kang, Dong-Won; Cho, Jung Sang
- Issue Date
- Aug-2023
- Publisher
- Elsevier Ltd
- Keywords
- lithium-ion batteries; Nitrogen-doped carbon; Spray pyrolysis; Three-dimensional micro sponge-ball; Titanium dioxide anode
- Citation
- Journal of Energy Storage, v.66
- Journal Title
- Journal of Energy Storage
- Volume
- 66
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/67902
- DOI
- 10.1016/j.est.2023.107396
- ISSN
- 2352-152X
2352-1538
- Abstract
- Hierarchically porous three-dimensional micro sponge-balls comprising highly conductive nitrogen-doped graphitic carbon (NGC) and anatase-type TiO2 nanodots (TiO2@NGC MSB) are synthesized using spray pyrolysis technique followed by heat treatment. The as-sprayed powders obtained after spray pyrolysis consist of polystyrene (PS) nanobeads-derived macropores and anatase TiO2 nanodots embedded in an amorphous carbon (AC)-NGC carbon matrix (TiO2@NGC-AC MSB). The subsequent heat treatment of the as-sprayed powders at 300 °C resulted in the formation of additional micropores by selective removal of the AC into gaseous products to form TiO2@NGC MSB. The obtained hierarchically porous and highly conductive architecture guarantees effective electrolyte infiltration inside the electrode, enhanced Li-ion diffusion, and faster charge transfer during the redox reactions. Benefited from the structural merits, the TiO2@NGC MSB anode exhibits remarkable electrochemical performance compared to those of TiO2@NGC-AC MSB and filled-type TiO2 anodes. A reasonable discharge capacity of 105 mA h g−1 at a high current density of 10.0 A g−1 and exceptional cycling performance (219 mA h g−1 with 0.0006 % decay rate after 2000 cycles at 2.0 A g−1 and 160 mA h g−1 with 0.003 % decay rate after 5000 cycles at 3.0 A g−1) are obtained. © 2023 Elsevier Ltd
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