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Study of lithiation of silicon nanopowder produced by induced plasma using ionic liquids as electrolytes

Grant number: 15/11164-0
Support Opportunities:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): November 01, 2015
Effective date (End): October 31, 2016
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal Investigator:Roberto Manuel Torresi
Grantee:Nédher Sánches Ramírez
Supervisor: Daniel Belanger
Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Research place: Université du Québec à Montréal (UQÀM), Canada  
Associated to the scholarship:14/01987-6 - Study of lithium intercalation into different nanostructured cathode based on oxides of transition metal using ionic liquid (ILs) with low viscosity synthesized from phosphonium and tetracyanoborate like electrolytes., BP.PD


At present, the challenge of lithium ion batteries is to develop systems with higher ciclability, and high power and energy densities. The main components of the battery are the cathode, the anode and the electrolyte. In this project we will be interested in the latter two. To achieve the requirements, our research work will be performing on new anode materials with high specific capacities. It is well known that silicon is a promising material for anodes (4200 mAh/g), to avoid some problems of this material such as expansion of volume during lithiation, we will be dealing with silicon anodes with small particles and thin films that are supposed to improve performance and cycle life markedly. On the other hand the need for lithium-ion batteries with high power and high energy density carries a safety related issue due to problems associated to the organic solvents typically used as electrolytes. It is known that ionic liquids (ILs) can be used as electrolytes once they are non-flammable and have high thermal and electrochemical stability. However, ILs with good transport properties which allow easy diffusion of lithium are necessary. For this reason ILs derived from tetracyanoborate anion and phosphonium cation will be prepared. These structures have low coordination capacity that causes a decrease of coulombic interactions. (AU)

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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)
SANCHEZ-RAMIREZ, NEDHER; ASSRESAHEGN, BIRHANU DESALEGN; TORRESI, ROBERTO M.; BELANGER, DANIEL. Producing high-performing silicon anodes by tailoring ionic liquids as electrolytes. ENERGY STORAGE MATERIALS, v. 25, p. 477-486, . (15/11164-0, 14/01987-6, 15/26308-7)
SANCHEZ-RAMIREZ, NEDHER; MONJE, IVONNE E.; MARTINS, VITOR L.; BELANGER, DANIEL; CAMARGO, PEDRO H. C.; TORRESI, ROBERTO M.. Four Phosphonium-based Ionic Liquids. Synthesis, Characterization and Electrochemical Performance as Electrolytes for Silicon Anodes. CHEMISTRYSELECT, v. 7, n. 4, . (14/01987-6, 20/08553-2, 19/26309-4, 19/07638-7, 17/20043-7, 15/11164-0, 15/26308-7, 21/07297-5)

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