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Synthesis of optimized cathode materials for all-solid-state lithium batteries
Batteries are already and will continue to be the most important energy storage systems for operating portable electronic devices and electric vehicles as well as for stationary energy storage in power grids. Lithium-ion batteries (LIBs), which dominate the market for portable devices and electric vehicles, have been optimized for higher energy density over the past 30 years. However, the physicochemical limit of LIBs based on the state-of-the-art Li[NixCoyMn1–x–y]O2 (NCM)/carbon chemistry has almost been reached, requiring the development of new battery technologies. To meet the future requirements, a further battery improvement is needed in terms of a higher energy density, a longer cycle life, and higher safety levels. All-solid-state batteries (ASBs), including ceramic ASBs with garnet electrolytes, are considered as one of the promising next generation battery technologies, so the further development and optimization of the garnet-type ASBs is the focus of this thesis. Unlike conventional LIBs, garnet-based ASBs use Li6.45Al0.05La3Zr1.6Ta0.4O12 (LLZO:Ta) garnet as separator and solid-state electrolyte (SSE). Due to the ceramic nature of the SSE, the garnetbased SSEs are nonflammable and offer a higher safety than LIBs based on liquid, organic electrolytes. In addition to nonflammability, the compatibility of LLZO:Ta with metallic lithium makes it very attractive for the development of ASBs with Li metal anodes, which can increase the energy density. Although Li metal anodes are an important prerequisite for a higher energy density, achieving this goal also requires the development of composites cathodes containing an SSE with a high ionic conductivity and a cathode active material (CAM) with a high gravimetric and volumetric capacity and high areal loadings. Since ceramic composite cathodes are typically manufactured via co-sintering, the elevated temperatures required for this process pose challenges for material compatibility. High-capacity cathode active materials like NCM exhibit insufficient material ...
Synthesis of optimized cathode materials for all-solid-state lithium batteries
Batteries are already and will continue to be the most important energy storage systems for operating portable electronic devices and electric vehicles as well as for stationary energy storage in power grids. Lithium-ion batteries (LIBs), which dominate the market for portable devices and electric vehicles, have been optimized for higher energy density over the past 30 years. However, the physicochemical limit of LIBs based on the state-of-the-art Li[NixCoyMn1–x–y]O2 (NCM)/carbon chemistry has almost been reached, requiring the development of new battery technologies. To meet the future requirements, a further battery improvement is needed in terms of a higher energy density, a longer cycle life, and higher safety levels. All-solid-state batteries (ASBs), including ceramic ASBs with garnet electrolytes, are considered as one of the promising next generation battery technologies, so the further development and optimization of the garnet-type ASBs is the focus of this thesis. Unlike conventional LIBs, garnet-based ASBs use Li6.45Al0.05La3Zr1.6Ta0.4O12 (LLZO:Ta) garnet as separator and solid-state electrolyte (SSE). Due to the ceramic nature of the SSE, the garnetbased SSEs are nonflammable and offer a higher safety than LIBs based on liquid, organic electrolytes. In addition to nonflammability, the compatibility of LLZO:Ta with metallic lithium makes it very attractive for the development of ASBs with Li metal anodes, which can increase the energy density. Although Li metal anodes are an important prerequisite for a higher energy density, achieving this goal also requires the development of composites cathodes containing an SSE with a high ionic conductivity and a cathode active material (CAM) with a high gravimetric and volumetric capacity and high areal loadings. Since ceramic composite cathodes are typically manufactured via co-sintering, the elevated temperatures required for this process pose challenges for material compatibility. High-capacity cathode active materials like NCM exhibit insufficient material ...
Synthesis of optimized cathode materials for all-solid-state lithium batteries
Roitzheim, Christoph (author) / Fattakhova-Rohlfing, Dina
2023-04-12
Theses
Electronic Resource
English
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