阳极
法拉第效率
电解质
相间
材料科学
钠
化学工程
阴极
离子
碳纤维
电化学
化学
电极
复合材料
冶金
有机化学
物理化学
生物
复合数
遗传学
工程类
作者
Jiangping Song,Mengjun Wu,Kan Fang,Tian Tian,Rui Wang,Haolin Tang
标识
DOI:10.1016/j.jcis.2022.08.096
摘要
Red phosphorus/carbon (P/C) materials have been extensively studied as promising anodes for sodium-ion batteries (SIBs) owing to their high capacities and moderate working potentials. However, the low initial Coulombic efficiency (ICE) and unstable solid-electrolyte interphase (SEI) of P/C composites limit their widespread applications. In this study, we develop an effective presodiation method to compensate for the irreversible sodium loss of the S-doped P/C (P/C@S) anode and yield a thin, uniform, and NaF-rich SEI layer on the presodiated P/C@S (pNa-P/C@S) anode during cycling. Consequently, the pNa-P/C@S anode exhibits a remarkable ICE of 98.7% as well as superior cycling performance and rate capability in the half cell. When pNa-P/C@S anode is coupled with conventional Na3V2(PO4)2F3, Na3V2(PO4)3, and NaCu0.12Ni0.23Fe0.33Mn0.33 cathodes, all the full cells demonstrate desirable ICEs (>98%), high energy densities, and excellent cycling performance. The proposed method has been extended to another anode (SnO2) to demonstrate its applicability in fabricating anodes with a high ICE and stable NaF-rich SEI layer.
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