阳极
法拉第效率
材料科学
插层(化学)
兴奋剂
碳纤维
电极
化学工程
电流密度
离子
钠
储能
氟
离子键合
纳米技术
无机化学
复合数
光电子学
化学
复合材料
有机化学
物理化学
热力学
功率(物理)
冶金
量子力学
工程类
物理
作者
Lingchen Kong,Yu Li,Wei Feng
标识
DOI:10.1007/s12209-021-00311-w
摘要
Abstract F-doping hard carbon (F–HC) was synthesized through a mild fluorination at temperature at relative low temperature as the potential anode for sodium-ion batteries (SIBs). The F-doping treatment to HC expands interlayer distance and creates some defects in the graphitic framework, which has the ability to improve Na + storage capability through the intercalation and pore-filling process a simultaneously. In addition, the electrically conductive semi-ionic C–F bond in F–HC that can be adjusted by the fluorination temperature facilitates electron transport throughout the electrode. Therefore, F–HC exhibits higher specific capability and better cycling stability than pristine HC. Particularly, F–HC fluorinated at 100 °C (F–HC100) delivers the reversible capability of 343 mAh/g at 50 mAh/g, with the Coulombic efficiency of 78.13%, and the capacity retention remains as 95.81% after 100 cycles. Moreover, the specific capacity of F–HC100 returns to 340 mAh/g after the rate capability test demonstrates its stability even at high current density. The enhanced specific capacity of F–HC, especially at low-voltage region, has the great potential as the anode of SIBs with high energy density.
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