Abstract
Many promising electrode materials for next-generation batteries are moisture-sensitive, resulting in various challenging issues. Here, we demonstrate the vital importance of the electrode preparation method in benchmarking their performance reliably using the O3-type NaNi1/3Fe1/3Mn1/3O2 (NFM111) as a model material. We show that the conventional slurry-based method leads to poor-quality electrodes, whereas those prepared by a dry method in argon exhibit a remarkable capacity which is significantly higher than previously reported values, highlighting that the energy density of layered sodium cathodes has been systematically underestimated. Collectively, we propose a general electrode preparation protocol for benchmarking moisture-sensitive battery materials.
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