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Improving the electrochemical performances using a V-doped Ni-rich NCM cathode
Seoung-Ju Sim1, Seung-Hwan Lee1, Bong-Soo Jin1
1Next-Generation Battery Research Center, Korea Electrotechnology Research Institute, Changwon, 641-120, South Korea.
Scientific Reports
|June 22, 2019
Summary
Vanadium doping enhances nickel-rich layered cathode materials for improved battery performance. This modification boosts capacity, cycling stability, and rate capability in lithium-ion batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Solid State Chemistry
Background:
- Nickel-rich layered oxides are crucial cathode materials for high-energy lithium-ion batteries.
- Enhancing the electrochemical performance and stability of these materials is critical for practical applications.
Purpose of the Study:
- To investigate the effect of vanadium doping on the structural and electrochemical properties of LiNi0.84Co0.10Mn0.06O2 cathode material.
- To determine if vanadium doping can improve the cycling stability and rate capability of the cathode.
Main Methods:
- Synthesis of vanadium-doped LiNi0.84Co0.10Mn0.06O2.
- Characterization using X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), and X-ray Photoelectron Spectroscopy (XPS).
- Electrochemical performance testing, including discharge capacity, cycling retention, and rate capability measurements.
Main Results:
- Vanadium was successfully incorporated into the crystal lattice of LiNi0.84Co0.10Mn0.06O2, maintaining high crystallinity.
- The 0.05 mol% vanadium-doped sample showed a superior initial discharge capacity (204.4 mAh g-1).
- The doped material exhibited improved cycling retention (88.1% after 80 cycles) and rate capability (86.2% at 2 C).
Conclusions:
- Vanadium doping effectively stabilizes the crystal structure of Ni-rich layered cathode materials.
- Doping enhances lithium-ion kinetics, leading to improved electrochemical performance.
- Vanadium-doped LiNi0.84Co0.10Mn0.06O2 is a promising cathode material for advanced lithium-ion batteries.
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