A new strategy to quickly synthetize true nanoparticles of the spinel LiMn2O4 by using a microwave-assisted hydrothermal route

Autor(es)

Silva, Daiane Piva B. ; Falqueto, Juliana Bruneli ; Bocchi, Nerilso ; Biaggio, Sonia R. ; Rocha-Filho, Romeu C.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 911, p. 9-pg., 2022-04-21.

Resumo

Based on a microwave-assisted hydrothermal reaction, a new route is proposed to prepare highly pure true nanoparticles (<= 15 nm) of the single-phase spinel LiMn2O4 (LMO) at a low temperature (140 degrees C) and short reaction time (5 min), using exclusively water-soluble reagents. The obtention of this material was con-firmed by using different techniques such as X-ray diffractometry, Rietveld crystal structure refinement, inductively coupled plasma-atomic emission spectroscopy and high-resolution transmission electron mi-croscopy. Electrochemical evaluations were performed by using cyclic voltammetry and galvanostatic charge and discharge tests. Only electrodes prepared from spinel LMO nanoparticles with an average size of similar to 15 nm showed electrochemical activity. From charge and discharge tests at a constant rate of C/5, the electrodes prepared from this active material exhibited an initial specific capacity of 128 mA h g(-1) with a capacity retention of 95% after the 27th cycle. The hallmark of the synthesis route here described is the saving of energy while preparing truly nanoparticulate LMO with excellent chemical, structural and pro-mising electrochemical properties. (C) 2022 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 18/16158-6 - Síntese e caracterização de nanopartículas de espinélios de manganês e lítio dopados com cátions, ânion e cátions + ânion como materiais de eletrodo positivo de bateria de íons lítio
• Beneficiário: Juliana Bruneli Falqueto
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 19/25700-1 - Caracterização in situ/operando de nanopartículas de óxido de manganês e lítio dopadas como materiais de eletrodo positivo para bateria de íons lítio
• Beneficiário: Juliana Bruneli Falqueto
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado