On the Reversible Sodium Plating/stripping Reaction in Porous SiCN(O) Ceramic: A Feasibility Study

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.

Unraveling Na‐Ion Insertion Mechanisms in Polymer‐Derived SiCN(O) Ceramic via Operando Raman Spectroscopy

“…[5] Numerous studies have addressed their functionality and demonstrated their suitability for both lithiumbased [6][7][8][9][10][11][12] and sodium-based batteries. [13][14][15][16][17] Among them, silicon oxycarbonitride (SiCN(O)) has attracted attention due to its ability to serve as a porous matrix for reversible plating of metallic sodium on its surface. [18] This class of ceramic materials possess a complex structure comprising a ceramic matrix containing embedded "free carbon" phase.…”