Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 81: Nanostructures at Surfaces I

O 81.4: Talk

Thursday, March 21, 2024, 11:15–11:30, MA 042

Nanoflower-like VSx@NC as a promising anode for stable potassium-ion storage — •Vincent Hartmann, Yulian Dong, Huaping Zhao, and Yong Lei — Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, Germany

Potassium-ion batteries (PIBs) are promising candidates for large-scale energy storage due to their low cost and abundant potassium content in the earth's crust. However, owing to the large radius of K+ ions, the electrode material structure is easily damaged during the potassiation/depotassiation process, hindering their further applications. VSx has become a new PIB anode material due to its low cost, high theoretical capacity, and unique structure, which can provide sites for potassium storage. Here, constructing a flower-like VSx covered by nitrogen-doped carbon as an anode electrode for PIBs can effectively enhance electrical and mechanical properties and provide abundant active sites for pseudocapacitive behavior to achieve fast kinetics. As a result, it exhibits excellent cycling stability with a special capacity of 249.3 mAh g-1 at 100 mA g-1 after 1000 cycles with an initial discharge capacity of 293.8 mAh g-1. The strategy in this work provides inspiration for the rational design of advanced nanostructured electrode materials to develop PIB anodes with long cycle life.

Keywords: potassium-ion batteries; energy storage; vanadium sulfides; nitrogen-doped carbon; nanoflower