The most viable alternative to Lithium-Ion Batteries is represented by Sodium Ion Batteries (SIBs) mainly due to the abundance and low cost of sodium. Highly performing materials for electrodes along with simple and scalable methods for battery production are constantly needed, possibly aimed at increasing energy and power density, as well as volumetric capacity. In this context, GeFe2O4 (GFO) spinel phase has been proposed as an anode material for SIBs due to its high theoretical capacity, despite poor cycling stability, potentially benefiting from nanoengineering and/or doping. In the present paper, electrospinning was employed to prepare GFO@C composites, consisting of undoped and Sn- or Mg- doped GFO homogeneously dispersed in a carbon nanofiber matrix. The lightweight and self-standing electrodes were characterized by different techniques demonstrating their structural and morphological features, elemental composition, active material content and carbon characteristics. The electrodes showed stable capacities, with doped samples outperforming the undoped one. At 600 mAg−1, capacities of 90 and 140 mAhg−1 were obtained for Mg- and Sn- doped GFO, with the latter still delivering 43 mAhg−1 at 1500 mAg−1. GFO-Sn@C sample maintained a capacity of 176 mAhg−1 at 150 mAg−1 for more than 600 cycles, making it currently the most promising anode.
Self-Supported (Sn,Mg)-Doped GeFe2O4@C Fibrous Nanocomposites for Sodium-Ion Battery Anodesmposites for Sodium-Ion Battery Anodes
Galinetto, Pietro;Bini, Marcella
2026-01-01
Abstract
The most viable alternative to Lithium-Ion Batteries is represented by Sodium Ion Batteries (SIBs) mainly due to the abundance and low cost of sodium. Highly performing materials for electrodes along with simple and scalable methods for battery production are constantly needed, possibly aimed at increasing energy and power density, as well as volumetric capacity. In this context, GeFe2O4 (GFO) spinel phase has been proposed as an anode material for SIBs due to its high theoretical capacity, despite poor cycling stability, potentially benefiting from nanoengineering and/or doping. In the present paper, electrospinning was employed to prepare GFO@C composites, consisting of undoped and Sn- or Mg- doped GFO homogeneously dispersed in a carbon nanofiber matrix. The lightweight and self-standing electrodes were characterized by different techniques demonstrating their structural and morphological features, elemental composition, active material content and carbon characteristics. The electrodes showed stable capacities, with doped samples outperforming the undoped one. At 600 mAg−1, capacities of 90 and 140 mAhg−1 were obtained for Mg- and Sn- doped GFO, with the latter still delivering 43 mAhg−1 at 1500 mAg−1. GFO-Sn@C sample maintained a capacity of 176 mAhg−1 at 150 mAg−1 for more than 600 cycles, making it currently the most promising anode.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
