The organic sodium salts/reduced graphene oxide composites as sustainable anode for solid-state sodium ion batteries

Abstract

The organic molecule materials have attracted more attention on energy storage and conversion field, due to their green, low cost and sustainable. Nevertheless, the issues of low conductivity and high solubility in organic electrolyte limit their development for sodium ion batteries (SIBs). In this work, the Na 2 C 7 NO 4 H 3 (Na 2 PDA)/reduced graphene oxide (rGO) nanocomposites are prepared via a simple low cost method. The addition of rGO can enhance electroconductivity, and formation of sodium salt improve the problem of high solubility in organic electrolyte. The reasonable designs of sodium salt and construction of micro-nano structure endow it remarkable electrochemical peculiarities. As anode for SIBs, it delivers excellent rate capabilities. Besides, the solid-state SIBs are assembled using ionic gel electrolyte, and the Na 2 PDA/rGO electrode also demonstrates outstanding solid state electrochemical performance. • The Na 2 PDA/rGO composites are prepared via acid-base neutralization reaction. • The Na 2 PDA/rGO electrode delivers excellent rate capabilities. • Electrochemical mechanism and reaction kinetics of Na 2 PDA/rGO are explored. • The electrode exhibited good solid-state sodium storage performances.