Materials for positive high voltage electrodes in Li + and Na + batteries

• Grant number: 20/07768-5
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: August 01, 2020
• End date: January 31, 2022
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Roberto Manuel Torresi
• Grantee: Marina Moraes Leite
• Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 15/26308-7 - Optimization of the physicochemical properties of nano -structured materials for applications in molecular recognition, catalysis and energy conversion/storage, AP.TEM

Abstract

Electrochemical systems for energy storage have had a fundamental role for mobile technology as well as for making renewable energy sources viable. However, with the increasing energy demand, the scientific community works on improving the consolidated technology, based on Li-ion intercalation, and on developing new technologies, such as Na-ion batteries. One possible approach is the use of positive materials having electrochemical activity in high potentials, which contributes to higher energy density. In this project, Mn-based layered materials, as oxides derived from LiMnO2 e NaMnO2, will be studied regarding their electrochemical activity involving the oxide anion in high potentials (>4.0 V vs Na/Na+). In order to do so, several physical-chemical and electrochemical characterization techniques will be used. Besides that, ionic liquids will be applied as electrolytes, once they are more stable than the conventional organic electrolytes, in order to guarantee the proper functioning of the cells in higher potentials. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

MORAIS, WILLIAM G.; LEITE, MARINA M.; TORRESI, ROBERTO M.. Titanium- and niobium-doped fluorophosphates as positive electrodes for sodium-ion batteries. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, v. 897, SEP 15 2021. (15/26308-7, 20/07768-5, 18/23072-0)

OBANA, THIAGO T.; LEITE, MARINA M.; MARTINS, VITOR L.; TORRESI, ROBERTO M.. Downplaying the role of water in the rheological changes of conducting polymers by using water-in-salt electrolytes. Physical Chemistry Chemical Physics, v. 23, n. 21, p. 12251-12259, JUN 7 2021. (19/02669-1, 15/26308-7, 17/10046-9, 20/07768-5, 13/22748-7)