Microwave-assisted hydrothermal synthesis of low-temperature LiCoO2

• Verfasst von: Jähne, Carsten [VerfasserIn]
• Verfasst von: Klingeler, Rüdiger [VerfasserIn]
• Titel: Microwave-assisted hydrothermal synthesis of low-temperature LiCoO2
• Verf.angabe: C. Jähne, R. Klingeler
• E-Jahr: 2012
• Jahr: July 1, 2012
• Umfang: 7 S.
• Fussnoten: Gesehen am 20.04.2018
• Titel Quelle: Enthalten in: Solid state sciences
• Ort Quelle: Amsterdam [u.a.] : Elsevier, 1999
• Jahr Quelle: 2012
• Band/Heft Quelle: 14(2012), 7, Seite 941-947
• ISSN Quelle: 1293-2558
• DOI: doi:10.1016/j.solidstatesciences.2012.04.033
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Cyclic voltammetry
• Sach-SW: Galvanostatic cycling
• Sach-SW: Hydrothermal synthesis
• Sach-SW: Lithium-ion batteries
• Sach-SW: Nanoscaled oxides
• K10plus-PPN: 157222245X

Abstract

A microwave-assisted hydrothermal synthesis route was developed for LT-LiCoO2 and compared with the conventional hydrothermal synthesis. Our X-ray diffraction, magnetisation, and electron microscopy and electrochemical studies in both cases indicate phase-pure and practically stoichiometric materials with Li-content ≥0.99. The microwave-assisted procedure allows reducing the synthesis temperature down to 170 °C which yields plate-like nano-sized LT-LiCoO2 compared to the conventionally synthesized micro-scaled material. These differences clearly show-up in the cyclic voltammetry and the galvanostatic intermittent titration technique data which are used for further characterisation of the materials. In both cases, a tiny non-stoichiometry is suggested by the presence of low-temperature small high-spin Co4+-ions. Our results show that the microwave-assisted process allows lower synthesis temperatures for practically stoichiometric LT-LiCoO2 which is associated to size-reduction of the resulting crystallites down to the nanometre-scale and a higher fraction of the competing spinel phase.