Written by: Marco Melzi d’Eril, Dr.-Ing. Magdalena Graczyk-Zajac, Prof. Dr. Ralf Riedel
Abstract: Sodium-ion batteries (SIBs) are a cost-effective and sustainable alternative to lithium-ion batteries (LIBs), which might be independent of rare raw materials. These advantages come at the expense of low energy density. Sodium metal batteries (SMBs) can provide a possible solution. In this work, we present the use of a porous silicon carbonitride (SiCN(O)) ceramic as an anodic matrix for reversible Na-plating. The role of the pores is investigated and the plating mechanism allowing reversible and uniform plating/stripping of sodium is also presented. Electrochemical studies show a stable and reversible capacity gain of around 60 mAh/g beyond the insertion capacity of the SiCN(O) ceramic over 100 cycles.