MECHANOCHEMICAL SYNTHESIS OF POROUS ORGANIC STRUCTURES APPLIED TO POSITIVE ELECTRODES OF LITHIUM-SULFUR (Li-S) BATTERIES

• Grant number: 22/10235-4
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: October 01, 2022
• End date: September 30, 2025
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
• Principal Investigator: Roberto Manuel Torresi
• Grantee: Heloise Molinari Sintaku da Silva
• Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 21/00675-4 - Tying up materials for electrochemical energy storage and catalysis, AP.TEM

Abstract

The high global energy consumption, mainly caused by the numerous portable devices, and the need to diversify the global energy supply have promoted the search for better energy storage technologies. In this context, new electrochemical storage devices stand out, especially lithium-sulfur batteries (LiBSs). This is because sulfur has a high theoretical energy capacity (1675 mA h g-1), high energy density (2600 Wh/kg), and is also abundant, nontoxic, and inexpensive. Despite the many advantages of using sulfur, there are still several issues that need to be addressed before LiBS can reach the market. The 'shuttle' effect caused by the dissolution of the polysulfides formed, the expansion after lithiation, and the insulating property of sulfur are some of the challenges. Therefore, the confinement of sulfur in porous structures such as covalent organic frameworks (COFs) and porous polymers is an interesting alternative to minimize the problems of LiBSs. The proposal for this project is the mechanochemical synthesis of porous materials to be used as electroactive materials in LiBS batteries. The porous materials will be characterized by physicochemical techniques to evaluate the structure. They will also be electrochemically tested as positive electrodes in LiBS batteries as alternatives to increase the lifetime and storage capacity as well as to understand the processes of LiBS batteries.

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)

CHAUQUE, SUSANA; SOUZA, BRENO L.; SINTAKU, HELOISE M.; ANDO, ROMULO A.; TORRESI, ROBERTO M.. Unveiling the polysulfide-PPY interaction for enhanced lithium-sulfur battery performance. Electrochimica Acta, v. 475, p. 12-pg., 2023-12-02. (22/10235-4, 18/11320-0, 19/09341-1, 21/00675-4)