Processing of polymer electrolyte in solid-state lithium-Ion batteries

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master_Wu_Zhaokun_2023.pdf (4.54 MB)

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Kemian tekniikan korkeakoulu | Master's thesis
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Date

2023-10-10

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Major/Subject

Material Science and Engineering

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Degree programme

Master's Programme in Advanced Materials for Innovation and Sustainability

Language

en

Pages

73+2

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Abstract

Solid-state lithium-ion batteries (SSLIBs) are a promising alternative to liquid electrolyte batteries due to their safety, energy density, and dendrite suppression. This thesis focuses on optimizing polymer electrolytes (SPEs) in SSLIBs, characterizing their properties, especially electrochemical and mechanical properties, and understanding their behaviors. The work includes a literature review, experimental procedures, and comprehensive electrolyte characterization. The characterization encompasses essential rheology characterizations that provide valuable insights into the mechanical properties of the electrolyte polymer matrix. Moreover, the electrochemical performance evaluation of these batteries under diverse conditions, including cycling stability, rate capability, and temperature dependence, is diligently conducted. Integrating the acquired outcomes, a well-informed selection is made for further experiments. Remarkably, the results showcase the developed SSLIB recipe's commendable energy density, thus positioning it as a promising candidate for various application domains. Overall, this master's thesis provides a comprehensive overview of the current state of SSLIB research and presents new findings that contribute to the development of SSLIB technology. The insights gained from this work will be valuable for researchers and engineers working to develop the next generation of high-performance, safe, and reliable batteries.

Description

Supervisor

Kallio, Tanja

Thesis advisor

Sorsa, Olli
Xu, Baixiang

Keywords

PEO-based solid electrolyte, SPE mechanical properties, upscaling to pouch cells, SSLIBs

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https://urn.fi/URN:NBN:fi:aalto-202310156418

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[dipl] Kemian tekniikan korkeakoulu / CHEM