Details

Autor(en) / Beteiligte

• Jiang, Yingjun
• Guo, Songtao
• Hu, Xianluo

Titel

Bifunctional sodium compensation of anodes for hybrid sodium-ion capacitors

Ist Teil von

• Science China materials, 2023-08, Vol.66 (8), p.3084-3092

Ort / Verlag

Beijing: Science China Press

Erscheinungsjahr

2023

Link zum Volltext

Quelle

SpringerLink

Beschreibungen/Notizen

• The low initial Coulombic efficiency (ICE) for the electrodes which stems from electrolyte decomposition and irreversible sodium uptake by the material itself, is one of the reasons limiting the large-scale sodium-ion capacitors (SICs). Here, we report a simple but precise bifunctional pre-sodiation of the Nb 2 O 5 anode (as a typical example) using sodium naphthalene/2-methyltetrahydrofuran as a pre-sodiated agent. The pre-sodiated agent realizes the pre-activation to achieve stable cycling of Na x Nb 2 O 5 , thus compensating the irreversible Na uptake. Moreover, this process offsets the electrolyte decomposition loss, and facilitates the formation of a robust inorganic-rich solid electrolyte interphase layer. Stable and high-energy SIC devices are achieved by compensating the interphase and bulk sodium loss of Nb 2 O 5 anodes. This work provides new insights into tuning the ICE of sodium-storage electrodes for next-generation and scaled-up applications of SICs.