Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 66: Poster: Nanostructures at Surfaces
O 66.14: Poster
Wednesday, March 20, 2024, 18:00–20:00, Poster C
Al-based anodes with high reversible capacity for Li-ion battery — •Kangzhe Cao1,2, Huiqiao Liu2, Jiahui Ma2, and Yong Lei1 — 1Fachgebiet Angewandte Nanophysik, Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693 Ilmenau, Germany — 2College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
Aluminum (Al) can alloy with Li at a lithiation potential of ~0.2 V to form LiAl, offering a theoretical capacity of 993 mAh g-1. Moreover, the merits of high electronic conductivity, abundant resources, and environmental benignity endow the Al anode competitive for Li-ion batteries (LIBs). However, the natural Al2O3 passivation layer leads to a large voltage dip (0.1 V), which would interrupt the lithiation process and result in a limited capacity. Meanwhile, the volume expansion (97 %) always makes the electrode in an unstable structure. Herein, we demonstrate a neat avenue to replace the inactive Al2O3 layer with active Sn at room temperature and further encapsulate them into the carbon-based matrix for LIBs. Not any acid or tedious process is needed. Benefiting from the elimination of Al2O3 and the cooperation of carbon matrix, the as-prepared Al-based anodes (Al@Sn@GO pellets and Al@C-Sn pellets) exhibit little voltage dip (0.03 V), higher reversible capacities, and longer cycling life compared to the commercial Al pellet electrode. Considering the low-cost, energy-saving, and facile scalable preparation of the Al-based anodes, our work presents an attractive vision for the development of the practical Al-based anode.
Keywords: energy storage systems; Aluminum anode; Li-ion battery; high capacity; surface passivation layer