Tailored synthesis of Ni0.25Mn0.75CO3 spherical precursors for high capacity Li-rich cathode materials via a urea-based precipitation method

Synthesis and Formation Mechanism of a Carbonate Precursor for the Fabrication of LiNi0.5Mn1.5O4 Material with a Hierarchical Micro/Nano Architecture

“…The color change of the filtrate with the reaction time is also verified by the residual Ni 2+ ion concentrations obtained by spectrophotometry of 614.15, 542.92, 395.95, 331.03, 182.91, 95.78, 59.97, and 27.85 mg/L after reaction times of 0.5, 1, 1.5, 2, 4, 6, 8, and 10 h, respectively. The carbonate precursor obtained in the present work is a mixture of MnCO 3 and NiCO 3 , both of which exist as separate phases, in agreement with the findings in ref . However, the precursor has a different composition to that synthesized previously by the same method, as the previous precursor was a single‐phase Ni 0.25 Mn 0.75 CO 3 solid solution.…”

“…To date, there have been some reports on the composition and structure of the carbonate precursor prepared by the urea‐assisted hydrothermal method. Qiu et al synthesized the spherical carbonate precursor Ni 0.25 Mn 0.75 CO 3 from Ni(NO 3 ) 2 · 6H 2 O, MnSO 4 · H 2 O, and urea as starting materials. They assumed that Ni 2+ and Mn 2+ ions could coprecipitate at the beginning of the reaction and that the particles formed became less homogeneous in chemical composition over time as a result of the increased concentration of residual Ni 2+ ions in solution.…”

Doping of Ni and Zn Elements in MnCO3: High‐Power Anode Material for Lithium–Ion Batteries

“…The formation of amorphous Li 2 CO 3 matrix can help to release the reaction strain and restrict the agglomeration of the obtained metal nanoparticles during cycling processes, thus contributing to preferable cycling stability . Possessing the advantages of conversion mechanism, high practical capacity, ideal capacity retention rate, good security, facile synthesis, and low cost, MnCO 3 shows great potential to be used as anode materials for high‐capacity lithium‐ion batteries. However, similar to most conversion anodes, the poor electrical conductivity and serious volume variation which often lead to the rapid capacity fading and disintegration of electrodes during cycling process are still great challenges .…”

Synthesis of Li[Li<sub>0.13</sub>Mn<sub>0.464</sub>Ni<sub>0.203</sub>Co<sub>0.203</sub>]O<sub>2</sub> Cathode Material by Hydrothermal Treatment Method

“…One of the great merits of the hydrothermal treatment on the carbonate precursor is it can prepared material with good electrochemical properties in a short period of calcination time [46]. The Li-rich layered oxides obtained via traditional carbonate coprecipitation method by other reports have to be heated at 900°C for more than 12 h [41,47,48]. In our study, materials with excellent electrochemical properties can be obtained by calcining only 8 hours.…”

“…The latter plateau is about the electrochemical removal of Li 2 O from the structure which is related to the activation of Li 2 MnO 3 . This is responsible for the large irreversible capacity in the first cycle [41]. As shown in Figure 4, the charge platform at 4.5 V disappears in the second cycle.…”