Journal
CELL REPORTS PHYSICAL SCIENCE
Volume 2, Issue 6, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.xcrp.2021.100465
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Funding
- BASF SE
- Federal Ministry of Education and Research (Bundesministerium fur Bildung und Forschung, BMBF) [03XP0114J]
- Fonds der Chemischen Industrie (FCI) through a Liebig scholarship
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The study used a design of experiments (DoE) approach to evaluate the influence of polymer binder and conductive carbon additive on SSB cells, discovering that the optimized combination can enhance electrochemical performance and processability.
Laboratory research into bulk-type solid-state batteries (SSBs) has been focused predominantly on powder-based, pelletized cells and has been sufficient to evaluate fundamental limitations and tailor the constituents to some degree. However, to improve experimental reliability and for commercial implementation of this technology, competitive slurry-cast electrodes are required. Here, we report on the application of an approach guided by design of experiments (DoE) to evaluate the influence of the type/content of polymer binder and conductive carbon additive on the cyclability and processability of Li1+x(Ni0.6Co0.2Mn0.2)(1-x)O-2 (NCM622) cathodes in SSB cells using lithium thiophosphate solid electrolytes. The predictions are verified by charge-discharge and impedance spectroscopy measurements. Furthermore, structural changes and gas evolution are monitored via X-ray diffraction and differential electrochemical mass spectrometry, respectively, in an attempt to rationalize and support the DoE results. In summary, the optimized combination of polymer binder and conductive carbon additive leads to high electrochemical performance and good processability.
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