期刊
JOURNAL OF POWER SOURCES
卷 587, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2023.233718
关键词
Energy storage; Sodium-ion batteries; Presodiation strategy; Iron-based phosphate; Sodium oxalate
This study presents a straightforward physical presodiation strategy to tackle the issue of initial charge loss in sodium-ion batteries. By directly adding sodium oxalate to the cathode electrode, additional sodium can be provided, leading to improved battery capacity and cycle life.
Loss of active sodium (Na) during the initial charge process is inevitable in Na-ion batteries due to the formation of solid electrolyte interphase and irreversible capacities of anodes, resulting in a low energy density and limiting cycle life at the full-cell level. Herein, we report a versatile and straightforward physical presodiation strategy to solve these issues. Directly adding sodium oxalate (Na2C2O4, denoted NCO) in the cathode electrode can provide additional Na (399 mAh g-1) during initial charging. A full cell using Na4Fe3(PO4)2P2O7 with 5 wt% NCO and hard carbon anode provides 19% higher capacity than that of hard carbon||Na4Fe3(PO4)2P2O7. The extended cycle life of full cells has been demonstrated, which can stably cycle 400th with a capacity retention rate of 81%, much higher than hard carbon||Na4Fe3(PO4)2P2O7 full cell (27% capacity retention rate). Good rate capability and high energy density have been demonstrated.
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