Role of Mg dopant on the electrochemical performance of LiNi0.5Co0.5O2 cathode materials for lithium rechargeable batteries

Abstract

Positive electrode materials, LiMg x Ni 0.5-x Co 0.5 O 2 (x = 0 \ x \ 0.5), have been successfully synthesized by microwave-assisted solution technique. The precursor has been analyzed by TG/DTA and the powder was calcined at 850°C. The XRD patterns reveal that the synthesized materials exhibit hexagonal layered structure corresponding to R3m space group. Coin cells of 2016 type have been fabricated using the synthesized layered material as cathode active material and lithium foil used as counter and reference electrode. Test cells were operated in the potential limits between 2.7 and 4.3 V using 1 M LiPF 6 in 1:1 EC/DEC as electrolyte. LiMg 0.2 Ni 0.3 Co 0.5 O 2 material delivers an average discharge capacity of around 165 mA hg -1 at 0.1 C rate over the investigated 20 cycles.

Palladium Nanoparticles on a Creatine‐Modified Bentonite Support: An Efficient and Sustainable Catalyst for Nitroarene Reduction

“…X‐ray photoelectron spectroscopy (XPS) of bentonite@Cl in Mg, Na, Ca, Al, Si, Cl, C, and O were studied. The XPS spectrum of Mg 1s showed a peak at 1302 eV confirming the presence of Mg(II) in the structure of bentonite (Figure a) . The binding energy observed for Na 1s is 1071.9 eV, which is characteristic of Na(I) oxidation state (Figure b) .…”

“…By increasing reaction time to 45 and 60 min, 33 and 71 % yields were obtained, respectively (Table 1, entries [11][12]. Then, the catalyst amount was increased to 0.06 and 0.1 mol % and the progress of the reaction at different times were studied (Table 1, entries [13][14][15]. Results indicated that using 0.1 mol % catalyst in 30 min afforded quantitative yield for the reaction (Table 1, entry 15).…”

“…The XPS spectrum of Mg 1s showed a peak at 1302 eV confirming the presence of Mg(II) in the structure of bentonite ( Figure 6a). [14] The binding energy observed for Na 1s is 1071.9 eV, which is characteristic of Na(I) oxidation state ( Figure 6b). [15] Furthermore, XPS spectrum in the Ca 2p region confirm the presence of Ca(II) with showing a doublet peak located at 347 and 350.5 eV (Figure 6c).…”

“…In order to find optimized reaction conditions, reduction of 1-chloro-4-nitrobenzene as a model reaction was selected and effect of different factors such as catalyst amount, solvent, time and reducing agent were studied ( [11][12]. Then, the catalyst amount was increased to 0.06 and 0.1 mol % and the progress of the reaction at different times were studied ( Table 1, entries [13][14][15]. Results indicated that using 0.1 mol % catalyst in 30 min afforded quantitative yield for the reaction (Table 1, entry 15).…”

High quality NMP exfoliated graphene nanosheet–SnO2 composite anode material for lithium ion battery

“…The high capacity delivering anode material are needed to stabilise structurally during charge-discharge due to the large volume expansion, on the other hand high capacity cathode materials require crystal structural stability and electronic conductivity which have been studied by many researchers. [27][28][29] Since the wide range of studies in RGO-SnO 2 and other RGO-metal/metal oxide [22][23][24][25][26] materials as anodes for lithium ion batteries, graphene based materials finds a unique place due to their superior properties. For the first time, we report the organic solvent exfoliation of graphite using NMP and the synthesis of an SnO 2 nanocomposite, made from the brownish graphene dispersed NMP transparent medium, via the co-precipitation method and annealing at 350 1C at ambient conditions.…”