Improvement of the electrochemical performance of LiNi0.33Mn0.33Co0.33O2 cathode material by chromium doping

Abstract

LiNi 0.33 Mn 0.33-x Co 0.33 Cr x O 2 (x=0, 0.01, 0.025, 0.05) materials were synthesized by Cr 3+ substitute of Mn 4+ to enhance their electrochemical properties. The structure and electrochemical properties were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and charge/discharge tests. The materials maintained the α-NaFeO 2 type layered structure and the discharge capacities were also increase by doping appropriate amount of Cr 3+ . The sample with x= 0.025 exhibited the highest discharge capability of 181.6 mAh g −1 and the best cycle performance. EIS measurement showed that the Cr-doped electrode had the lower resistance impedance increase during cycling. The chemical diffusion coefficient of Li + ion (D Li ) was measured by potentiostatic intermittent titration technique (PITT). The result showed that D Li in Cr-doped electrode was faster than that of the un-doped one. cathode material, Cr-doped, Li-ion battery, electrochemical properties Citation: Wang M, Chen Y B, Wu F, et al. Improvement of the electrochemical performance of LiNi 0.33 Mn 0.33 Co 0.33 O 2 cathode material by chromium doping.

Doped Nanoscale NMC333 as Cathode Materials for Li-Ion Batteries

“…In conclusion, the substituted elements slightly enlarged the interlayer spacing favoring a high degree of ordering and improving the ionic transport kinetics, i.e., Li + ions are faster in doped materials than in the undoped lattice. Less Li + /Ni 2+ cation mixing that favors kinetics was also reported for doped NMC materials [26,73]. The poor electrochemical performance of NMC333 is in agreement with a previous report [74], and is due to the important local distortions, which oppose the Li motion and decrease the lattice stability.…”

Advanced Materials for Electrochemical Energy Conversion and Storage Devices

“…In conclusion, the substituted elements slightly enlarged the interlayer spacing favoring a high degree of ordering and improving the ionic transport kinetics, i.e., Li + ions are faster in doped materials than in the undoped lattice. Less Li + /Ni 2+ cation mixing that favors kinetics was also reported for doped NMC materials [26,73]. The poor electrochemical performance of NMC333 is in agreement with a previous report [74], and is due to the important local distortions, which oppose the Li motion and decrease the lattice stability.…”

Investigation of Zinc and Chromium Substitution Nickel-rich LiNi1−x−yZnyCrxO2 Cathode Materials to Improve the Redox Reaction of Lithium-ion Battery: A First-principles Study

“…Furthermore, Wang et al observed the most electrochemically prominent composition of LiNi 0.01 Cr 0.01 Mn 1.98 O 4 compounds, which retained 82% of discharge capacity at 0.1 C. After doping Cr, the lattice parameters both a and c increased. 24 In the literature, Zn and Cr separately doped in LiNiO 2 demonstrate the potential for Li-ion batteries. However, we simultaneously co-doped Zn and Cr with different concentrations in LiNiO 2 .…”