RT Journal Article
T1 Hybrid carboxylate-Schiff-bases as electroactive anode materials for potassium-ion batteries
A1 Castillo Martínez, Elisabet
A1 Solana Madruga, Elena
A1 Ebrahimi Koodehi, Sohaila
A1 Leskes, Michal
A1 del Burgo Olivares, Carlos
A1 Linage, Martín
A1 Martín Gandul, María Del Carmen
A1 Sánchez Ahijon, Elena
A1 Sánchez Ahijón, Elena
A1 Cascos, Vanessa
A1 Cascos Jiménez, Vanessa Amelia
A1 Avila Brande, 
A1 Ávila Brande, David
AB Three new crystalline potassium salts of hybrid carboxylate/Schiff-base oligomers are reported as electrochemically active anode materials for potassium ion batteries. One of them is constituted by the phenyl “dimer” KOOC-ϕ-C=N-ϕ-COOK (BSK-1) and the other two by the isomer “trimers” KOOC-ϕ-C=N-ϕ-N=C-ϕ-COOK (BSK-2 A) and KOOC-ϕ-N=C-ϕ-C=N-ϕ-COOK (BSK-2B). A structural model refined from powder X-ray diffraction data is discussed for the short (dimeric) salt. A pseudo-monoclinic unit cell, with space group P and lattice parameters a = 15.88(1) Å, b = 5.772(2) Å, c = 3.887(1) Å and β = 98.8(1)0, contains a single molecule. Crystal packing of the aromatic molecules can be described by a slipped π-stacking along the c-axis. All three oligomers are electrochemically active at voltages low enough to be used as anode in potassium ion batteries, at average voltages of 1.2 V vs K+/K for the dimer and 1.05 V vs K+/K for the trimers. Combined with 3.9 M KFSI in DME electrolyte, they show reversible capacities of 115 mAh/g (dimer), 233 mAh/g (BSK-2 A) and 104 mAh/g (BSK-2B) at C/10, with capacity retentions at 1C of 74% and 65% for the dimer and the trimers respectively. Based on the dQ/dV plots, the trimers react through two solid solution mechanisms, forming a stable radical intermediate, whereas the dimer changes from a single solid solution to a solid-solution+biphasic reaction. Future in-situ x-ray diffraction studies based on the solved crystal packing should enable to confirm these mechanisms.
PB Elsevier
YR 2024
FD 2024-07-01
LK https://hdl.handle.net/20.500.14352/125100
UL https://hdl.handle.net/20.500.14352/125100
LA eng
NO 1. Castillo-Martínez E, Solana-Madruga E, Ebrahimi-Koodehi S, Leskes M, del Burgo-Olivares C, Linage M, et al. Hybrid carboxylate-Schiff-bases as electroactive anode materials for potassium-ion batteries. Sustainable Materials and Technologies [Internet]. 2024 Feb 1;40:e00840. Available from: https://www.sciencedirect.com/science/article/pii/S2214993724000204  ‌
NO MCIN/AEI
NO European Union PRTR
DS Docta Complutense
RD 7 abr 2026