阳极
电解质
相间
钠
阴极
化学
磷酸铁锂
电极
碳纤维
磷酸盐
化学工程
离子
材料科学
电化学
生物化学
有机化学
遗传学
物理化学
复合材料
复合数
工程类
生物
作者
Yongjie Cao,Guodong Li,Jiawei Chen,Jie Xu,Xun‐Lu Li,Nan Wang,Xiue Zhang,Mochou Liao,Yao Liu,Xiaoli Dong,Yonggang Wang,Yongyao Xia
标识
DOI:10.1016/j.jpowsour.2023.233718
摘要
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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