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Synergistic Effect of F
Kai Liu1, Qingqing Zhang1, Sheng Dai2,3
1School of Chemical Engineering and Technology , Tianjin University , Tianjin 300350 , P. R. China.
ACS Applied Materials & Interfaces
|September 13, 2018
Summary
This study enhances lithium nickel cobalt manganese oxide (LNCM) cathodes using LiPF6, improving stability and capacity retention. The modified LNCM-2 material shows significantly better performance in batteries after extended cycling.
Area of Science:
- Materials Science
- Electrochemistry
- Surface Chemistry
Background:
- Commercial LiNi0.5Co0.2Mn0.3O2 (LNCM) cathode materials are crucial for lithium-ion batteries.
- Improving the long-term cycling stability and capacity retention of LNCM is essential for practical applications.
Purpose of the Study:
- To modify a commercial LNCM cathode material using LiPF6 as a precursor.
- To investigate the effects of surface modification on the structural and electrochemical properties of LNCM.
Main Methods:
- Low-temperature air calcination using LiPF6 as a precursor.
- X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) for structural analysis.
- Electron energy loss spectroscopy (EELS) and X-ray photoelectron spectroscopy (XPS) for surface composition analysis.
Main Results:
- Surface modification with LiF coating and F- doping was confirmed, alongside partial Ni3+ reduction to Ni2+.
- The modified LNCM-2 material exhibited enhanced cycling stability, retaining 93.7% capacity after 100 cycles at 0.5 C and 81.1% after 300 cycles at 5 C.
- Significantly improved capacity retention (90%) and Coulombic efficiency (>99.5%) were observed in succinonitrile-based electrolyte after 300 cycles at 5 C.
Conclusions:
- The synergistic effect of LiF coating and F- doping effectively enhances the electrochemical performance of LNCM cathodes.
- The surface modification strategy offers a promising route for developing advanced cathode materials for high-performance lithium-ion batteries.
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