Desenvolvimento de eletrodos a base de carvão ativado (AC) para baterias de lítio-enxofre (Li-S): uma proposta escalável

Author(s)

Érick Alves Santos

• Document type: Master's Dissertation
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Elétrica e de Computação
• Defense date: 2022-08-25

Examining board members

Hudson Giovani Zanin; Josimar Ribeiro; Gustavo Doubek

• Advisor: Hudson Giovani Zanin

Abstract

Lithium-Sulfur batteries (LSBs) are high theoretical and specific capacity energy storage devices of 1675 mAh g-1 and 2600 Wh kg-1. LSBs have at least five times the energy storage capacity of lithium-ion batteries. The raw material of the Li-S battery is S8 sulfur, which has a very low cost and is an abundant resource in the national territory, which means that this technology can be improved in Brazil with a very high chance of success. Fundamental studies are taking place in the best centers in the world to solve the problems associated with the chemistry of this device. One of the biggest problems is the shuttle effect. This master's thesis aims to present an electrochemical study of the battery's internal behaviour following the state of charge (SoC) variations with electrochemical impedance spectroscopy (EIS). The electrode produced here reached discharges of approximately 1350 mA.h gsulfur cm-2, 360 cycles and theoretical gravimetric energy of 5.0367 ?????/????g; which are superior results for the first Li-S coin cell produced in our department. The electrodes were already produced aiming at the scaling of the cell and presented excellent adhesion, capacity and flexibility. Here we have a proposal for an activated carbon (AC) based electrode with commercialization potential for the production of the first Li-S batteries made in the national territory. The results obtained are very promising for the development of Li-S batteries in Brazil (AU)

• FAPESP's process: 20/04281-8 - Proposal for syntheses, characterization and application of electrodes for Li-S battery like capacitor
• Grantee: Érick Alves Santos
• Support Opportunities: Scholarships in Brazil - Master