Spremljanje dinamike rasti litijevih dendritov z magnetnoresonančnim slikanjem

Orel, Lara (author), Mohorič, Aleš (mentor), Mikac, Mojca Urška (comentor)

Baterije so pomemben vir električne energije. Zaradi vse večje potrebe po učinkovitem shranjevanju električne energije razvoj baterij predstavlja velik izziv predvsem v smeri čim večje energijske gostote. Kovinski litij je zaradi svoje velike teoretične kapacitete in najnižje negativne elektrokemijske napetosti obetaven anodni material za polnilne Li-ionske baterije. Rast litijevih dendritov med odlaganjem litija pri polnjenju baterij z litijevo anodo predstavlja ključno težavo pri uporabi elektrode iz kovinskega litija v sekundarnih baterijskih sistemih, zato je pozornost zadnjih nekaj desetletij usmerjena v karakterizacijo in analizo procesov tvorjenja in rasti litijevih dendritov z namenom ugotovitve mehanizma nastajanja dendritov, da bi lahko uspešneje predvideli in preprečili njihov nastanek. Pri tem je ključnega pomena tudi razvoj neinvazivnih merskih tehnik in metod, ki bi omogočile učinkovito spremljanje procesov in strukturnih sprememb znotraj baterij v živo. V nalogi smo litijeve dendrite spremljali v simetrični Li-Li elektrokemijski celici posredno z metodo 1H MRI s sekvenco spinskega odmeva 3D. S slik smo določili prostornine dendritov ob različnih časih polnjenja, ki smo jih nato primerjali z izračunanimi teoretičnimi vrednostmi.

• Language: Slovenian
• Keywords: Li-ionske baterije, Litijevi dendriti, MRI
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FMF - Faculty of Mathematics and Physics
• Year: 2021
• PID: 20.500.12556/RUL-124586
• COBISS.SI-ID: 49778435
• Publication date in RUL: 05.02.2021

OREL, Lara, 2021, Spremljanje dinamike rasti litijevih dendritov z magnetnoresonančnim slikanjem [online]. Bachelor’s thesis. [Accessed 8 July 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=124586

Secondary language

• Language: English
• Title: Monitoring of lithium dendrite growth using 1H MRI

Abstract

Batteries are an important source of electrical energy. Due to the growing demand for efficient storage of electricity, the development of batteries, especially in the direction of maximizing energy density, is a major challenge. As a result of its high theoretical specific capacity and low potential lithium metal is a promising anode material for rechargeable Li-based batteries. The growth of lithium dendrites during charging is a major barrier to the development of high-capacity Li-metal-based secondary batteries. For this reason, the attention over the past several decades has been focused on the characterization and analysis of lithium electrodeposition and dendrite formation with the aim to determine the mechanism of dendrite formation, so that dendrites can be predicted and prevented more effectively. Central to these objectives is the development of analytical and non-destructive methods that can be used in situ to operating batteries. In this work, lithium dendrites were monitored in a symmetric Li-Li electrochemical cell indirectly by the 1H MRI method, with a 3D spin-echo sequence. From the images, we determined the volumes of dendrites at different times during the operation of a cell, which we then compared with the calculated theoretical values.

• Keywords: Li-ion batteries, Lithium dendrites, MRI