Doped Nanoscale NMC333 as Cathode Materials for Li-Ion Batteries

Abstract

A series of Li(Ni1/3Mn1/3Co1/3)1−xMxO2 (M = Al, Mg, Zn, and Fe, x = 0.06) was prepared via sol-gel method assisted by ethylene diamine tetra acetic acid as a chelating agent. A typical hexagonal α-NaFeO2 structure (R-3m space group) was observed for parent and doped samples as revealed by X-ray diffraction patterns. For all samples, hexagonally shaped nanoparticles were observed by scanning electron microscopy and transmission electron microscopy. The local structure was characterized by infrared, Raman, and Mössbauer spectroscopy and 7Li nuclear magnetic resonance (Li-NMR). Cyclic voltammetry and galvanostatic charge-discharge tests showed that Mg and Al doping improved the electrochemical performance of LiNi1/3Mn1/3Co1/3O2 in terms of specific capacities and cyclability. In addition, while Al doping increases the initial capacity, Mg doping is the best choice as it improves cyclability for reasons discussed in this work.

Synthesis of High Surface Area α-KyMnO2 Nanoneedles Using Extract of Broccoli as Bioactive Reducing Agent and Application in Lithium Battery

“…Although the application of cryptomelane KyMnO2 nanoparticles have been widely investigated in supercapacitor, to the best our knowledge, there is a limited number of studies devoted as cathode materials in LiBs [20,26,60,[72][73][74][75][76][77]. In this work, the nanostructured cryptomelane-type KyMnO2 has been successfully prepared by the reduction of MnO4 − ions in acidic medium at room temperature.…”

“…This analysis can be considered as an efficient tool to determine the electrochemical spectroscopy of an electrode [73]. For instance, IC has been successfully applied to analyze the behavior of doped or blended cathodes [74,75]. The IC curves were extracted from the GCD profiles (lithiation process) to further characterize the electrochemical behavior at the first and second cycles showing the transformation after the first lithiation process.…”

Designing positive electrodes with high energy density for lithium-ion batteries

“…Indeed, various cations and anions (such as B, F, Mg, and Al) have been investigated as dopants for positive-electrode materials with high energy density, all of which improved capacity retention during charge/discharge cycling. [71][72][73][74][75][76][77]92,93,102,103,[106][107][108][109][169][170][171][172][173] For example, doping B into a nickel-rich layered oxide was reported to increase capacity retention aer 100 cycles from 83% to 92% by suppressing crack formation. 92…”

Ag-Modified LiMn2O4 Cathode for Lithium-Ion Batteries: Coating Functionalization

“…The differential capacity curves (−dQ/dV vs. V) were plotted to analyze the lithiation/delithiation processes (i.e., study of redox potentials) in LMO electrodes. These plots differentiate the chargedischarge capacity (Q) from data in galvanostatic charge-discharge curves with respect to the cell voltage and transform voltage plateaus on the V-Q curves into peaks, which further characterize the electrochemical behavior of coated or doped electrodes and identify the gradual changes (if any) after the subsequent lithiation/delithiation process [92,93]. This method can be more accurate than cyclic voltammetry if measurements are carried out at low current density (≤15 mA g −1 ).…”