Solvothermal synthesis of Sn3N4as a high capacity sodium-ion anode: theoretical and experimental study of its storage mechanism

A new simple and scalable method to synthesise spinel-structured Sn(3)N(4)has been developed using SnCl(4)and LiNH(2)precursors under solvothermal conditions. Nanocrystalline Sn(3)N(4)with a crystallite size < 10 nm was produced and tested as anode material in sodium half cells, demonstrating a very high reversible (de-sodiation) capacity of similar to 850 mA h g(-1)measured over 50 cycles, the highest reported reversible capacity for a sodium anode apart from sodium itself.Ex situX-ray absorption spectroscopy and X-ray diffraction show that the electrochemical reactions are reversible and that Sn(3)N(4)is recovered upon re-oxidation. X-ray diffraction shows that the peaks associated with Sn(3)N(4)reflections become narrower during discharge (reduction), evidencing that the smaller Sn(3)N(4)particles are primarily involved in the electrochemical reactions, and broadening of the peaks is reversibly recovered upon oxidation. The analysis of the near edge X-ray absorption data (XANES) shows that the Sn oxidation state decreases during reduction and nearly recovers the initial value during oxidation. DFT calculations suggest that the insertion of Na into the Sn(3)N(4)surface followed by substitution of tetrahedral Sn by Na is energetically favourable, and evidence of the removal of tetrahedral Sn from the spinel Sn(3)N(4)structure is obtained from the analysis of the extended X-ray absorption fine-structure (EXAFS) measurements of reduced electrodes, which also show the recovery of the pristine structure at the end of oxidation. DFT also shows that Sn substitution by Na is only favourable at the Sn(3)N(4)surface (not for bulk Sn3N4), in agreement with the electrochemical characterisation that shows that controlling the nanoparticle size is crucial to achieve full utilisation of Sn3N4(and thus high capacity).