材料科学
电解质
极地的
离子液体
乙醚
大气温度范围
钠
离子键合
金属
航程(航空)
无机化学
化学工程
离子
有机化学
物理化学
热力学
冶金
复合材料
化学
电极
物理
天文
工程类
催化作用
作者
Yang Liu,Shouxiang Lu,Zhicheng Wang,Jingjing Xu,Suting Weng,Jiang‐Yan Xue,Haifeng Tu,Fengrui Zhang,Lingwang Liu,Yiwen Gao,Hong Li,Jieyun Zheng,Xiaodong Wu
标识
DOI:10.1002/adfm.202312295
摘要
Abstract Sodium (Na) metal batteries (SMBs) have attracted many attentions because of high specific capacity and low redox potential. However, SMBs encounter several crucial challenges including Na dendrites growth, severe interfacial side reactions and safe issues from liquid organic electrolyte. In this study, a non‐flammable 1,2‐bis (1,1,2,2‐tetrafluoroethoxy) ethane (TFEE) aided ionic liquid (IL) electrolyte (TILE) is reported with sodium bis(trifluoromethylsulfonyl)imide (NaTFSI) salt and N‐methyl‐N‐propylpyrrolidinium bis(fluorosulfonyl)imide ([Py 13 ][FSI]) IL solvent. The IL solvent contains plentiful organic cations and anions, which helps to provide a cationic shielding effect by [Py 13 ] + cations and regulate the Na + solvation structure with more FSI − and TFSI − anions. The unique solvation structure of Na + facilitates a stable inorganic‐rich solid electrolyte interphase (SEI), effectively inhibiting unstable Na deposition and suppressing side reactions between the electrolyte and Na‐metal in SMBs. Therefore, the Na 3 V 2 (PO 4 ) 3 (NVP)||Na cells with TILE can deliver good rate capability and superior cycling performance with capacity retention of 95.5% and Coulombic efficiency of ≈99.9% after 2000 cycles at 5C rate and 25 °C. The high‐voltage NaNi 0.33 Fe 0.33 Mn 0.33 O 2 (NFM)||Na cells with TILE can also deliver good cycling performance with capacity retention of 92% after 150 cycles in the voltage range of 2.0–4.1 V at 0.5C rate and 25 °C.
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